Improve TUI about, CLI, and update checks

README.md

@@ -29,6 +29,7 @@ https://www.nodeseek.com/post-710243-1
 - 支持终端窗口大小变化，窄窗口下会自动裁剪和滚动
 - 支持鼠标和触控板：列表点击选择、滚轮滚动，详情页可滚动并点击切换标签/窗口
 - 支持 ASCII / 无颜色兼容模式，适合 Unicode 显示异常的终端
+- 支持后台检查 ktui 自身更新和 Komari 服务端新版本提示
 - 支持远程一行安装脚本，自动识别系统和 CPU 架构并下载对应 Release
 
 ## 安装
@@ -85,6 +86,7 @@ go run ./cmd/ktui
 
 ```sh
 ./ktui help
+./ktui help status
 ./ktui help config
 ./ktui help keys
 ```
@@ -98,14 +100,14 @@ go run ./cmd/ktui
 检查或安装更新：
 
 ```sh
-./ktui update --check
-./ktui update
+./ktui update check
+./ktui update install
 ```
 
-进入 TUI 时会自动在后台检查是否有新版本。发现新版本后，界面顶部会提示 `UPDATE ... available`，底部会出现 `u update`；按 `u` 或点击该提示会显示更新命令。实际更新请退出 TUI 后运行：
+进入 TUI 时会自动在后台检查 ktui 自身是否有新版本，也会根据当前 Komari 服务端版本检查 `komari-monitor/komari` 的 GitHub Release。发现新版本后，界面顶部会提示 `UPDATE ... available`，底部会出现 `u update`；按 `u` 或点击该提示会显示可用更新详情。ktui 自身更新请退出 TUI 后运行：
 
 ```sh
-ktui update
+ktui update install
 ```
 
 指定 Komari 地址：
@@ -123,19 +125,33 @@ ktui update
 只拉取一次并打印摘要，不进入 TUI：
 
 ```sh
-./ktui --once
+./ktui status
 ```
 
 导出当前节点状态：
 
 ```sh
-./ktui export json
-./ktui export csv --output nodes.csv
 ./ktui export markdown -o report.md
+./ktui export csv --output nodes.csv
+./ktui export json
 ```
 
 导出内容包含站点摘要、在线状态、CPU/RAM/磁盘百分比、实时网络、累计流量、流量上限占比、过期状态和异常原因。
 
+## 命令结构
+
+```text
+ktui [flags]
+ktui status [flags]
+ktui export <markdown|csv|json> [flags]
+ktui config <init|path|show|set|help>
+ktui update <check|install>
+ktui version
+ktui help [status|config|keys|update|export]
+```
+
+TUI 专属显示参数使用 `--mode sheet|line`。一次性拉取摘要使用 `ktui status`，更新检查和安装分别使用 `ktui update check`、`ktui update install`。
+
 ## 配置文件
 
 初始化配置：
@@ -222,13 +238,13 @@ KTUI_ASCII=1 NO_COLOR=1 ./ktui
 卡片视图，默认模式：
 
 ```sh
-./ktui --sheet
+./ktui --mode sheet
 ```
 
 逐行列表视图：
 
 ```sh
-./ktui --line
+./ktui --mode line
 ```
 
 `line` 模式会根据终端宽度自动增减列。宽屏下会显示 CPU、RAM、磁盘、地区、实时网络、负载、运行时间、累计流量、连接数、进程数、过期时间、系统和标签。
@@ -282,7 +298,8 @@ EXP -
 - `r`：立即刷新
 - `d`：打开或重新加载选中节点的详情数据
 - `a`：切换 ASCII 兼容模式
-- `u`：有新版本时显示更新命令
+- `u`：有新版本时显示 ktui 或 Komari 服务端更新详情
+- `?`：打开 about 视图
 - `q` / `Ctrl-C`：在列表页退出
 
 异常高亮阈值可以通过配置文件、`ktui config set warn-cpu 85`、`ktui config set warn-ram 85`、`ktui config set warn-disk 90`、`ktui config set warn-expiry-days 14` 或设置页调整。
@@ -299,12 +316,12 @@ ktui version
 
 ## 自更新
 
-`ktui update` 会从 Gitea Release 下载当前系统和架构对应的压缩包，使用 `checksums.txt` 校验后替换当前二进制。
+`ktui update install` 会从 Gitea Release 下载当前系统和架构对应的压缩包，使用 `checksums.txt` 校验后替换当前二进制。只检查新版本时使用 `ktui update check`。
 
 ```sh
-ktui update --check
-ktui update
-ktui update --tag v0.1.0
+ktui update check
+ktui update install
+ktui update install --tag v0.1.0
 ```
 
 默认更新源：
@@ -316,10 +333,10 @@ https://gitea.bytevibe.dev/api/v1/repos/gary/ktui
 如果仓库是私有仓库，可以通过环境变量传入 token：
 
 ```sh
-KTUI_UPDATE_TOKEN=your_token ktui update
+KTUI_UPDATE_TOKEN=your_token ktui update install
 ```
 
-Windows 无法在程序运行时直接替换当前 `.exe`，`ktui update` 会下载新文件并提示手动替换。
+Windows 无法在程序运行时直接替换当前 `.exe`，`ktui update install` 会下载新文件并提示手动替换。
 
 ## 详情页
 

cmd/ktui/export.go

@@ -655,7 +655,7 @@ func printExportHelp() {
 	fmt.Print(`ktui export - export current Komari node status
 
 Usage:
-  ktui export <json|csv|markdown> [flags]
+  ktui export <markdown|csv|json> [flags]
 
 Flags:
   --url URL          Komari base URL
@@ -665,8 +665,8 @@ Flags:
   --config PATH     config file path
 
 Examples:
-  ktui export json
-  ktui export csv --output nodes.csv
   ktui export markdown -o report.md
+  ktui export csv --output nodes.csv
+  ktui export json
 `)
 }

cmd/ktui/main.go

@@ -36,50 +36,54 @@ func main() {
 			fatal(err)
 		}
 	}
-	if len(args) > 0 && (args[0] == "version" || args[0] == "--version" || args[0] == "-v") {
-		printVersion()
-		return
-	}
-	if len(args) > 0 && args[0] == "update" {
-		if err := handleUpdate(args[1:]); err != nil {
+	if err := handleCommand(args); err != nil {
 		fatal(err)
 	}
-		return
-	}
-	if len(args) > 0 && args[0] == "config" {
-		if err := handleConfig(args[1:]); err != nil {
-			fatal(err)
-		}
-		return
-	}
-	if len(args) > 0 && args[0] == "export" {
-		if err := handleExport(args[1:]); err != nil {
-			fatal(err)
-		}
-		return
-	}
-	if len(args) > 0 && (args[0] == "help" || args[0] == "--help" || args[0] == "-h") {
-		if err := handleHelp(args[1:]); err != nil {
-			fatal(err)
-		}
-		return
-	}
-	if len(args) > 0 && looksLikeCommand(args[0]) {
-		usageError(fmt.Errorf("unknown command %q", args[0]))
 }
 
+func handleCommand(args []string) error {
+	if len(args) == 0 {
+		return handleTUI(args)
+	}
+	switch args[0] {
+	case "status":
+		return handleStatus(args[1:])
+	case "export":
+		return handleExport(args[1:])
+	case "config":
+		return handleConfig(args[1:])
+	case "update":
+		if err := handleUpdate(args[1:]); err != nil {
+			return err
+		}
+		return nil
+	case "version":
+		printVersion()
+		return nil
+	case "help":
+		return handleHelp(args[1:])
+	default:
+		if !looksLikeCommand(args[0]) {
+			return handleTUI(args)
+		}
+		usageError(fmt.Errorf("unknown command %q", args[0]))
+		return nil
+	}
+}
+
+func handleTUI(args []string) error {
 	cfg, cfgPath, err := loadEffectiveConfig()
 	if err != nil {
-		fatal(err)
+		return err
 	}
 
 	intervalDefault, err := cfg.IntervalDuration()
 	if err != nil {
-		fatal(err)
+		return err
 	}
 	timeoutDefault, err := cfg.TimeoutDuration()
 	if err != nil {
-		fatal(err)
+		return err
 	}
 
 	var (
@@ -89,77 +93,53 @@ func main() {
 		timeout        time.Duration
 		realtimePoints int
 		chartYAxis     string
-		once           bool
+		modeValue      string
 		ascii          bool
 		noColor        bool
-		lineMode       bool
-		sheetMode      bool
 	)
 
-	flags := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+	flags := flag.NewFlagSet("ktui", flag.ExitOnError)
 	flags.StringVar(&baseURL, "url", cfg.URL, "Komari base URL")
 	flags.StringVar(&apiKey, "api-key", cfg.APIKey, "Komari API key (sent as Bearer token)")
 	flags.DurationVar(&interval, "interval", intervalDefault, "refresh interval")
 	flags.DurationVar(&timeout, "timeout", timeoutDefault, "HTTP timeout")
 	flags.IntVar(&realtimePoints, "realtime-points", cfg.RealtimePoints, "realtime chart sample limit, 0 auto")
 	flags.StringVar(&chartYAxis, "chart-y-axis", cfg.ChartYAxis, "percent chart Y axis mode: absolute or relative")
-	flags.BoolVar(&once, "once", false, "fetch once and print a summary without entering the TUI")
+	flags.StringVar(&modeValue, "mode", cfg.Mode, "view mode: sheet or line")
 	flags.BoolVar(&ascii, "ascii", cfg.ASCII, "use ASCII-only rendering for terminals/fonts with Unicode issues")
 	flags.BoolVar(&noColor, "no-color", cfg.NoColor, "disable ANSI color and inverse video")
-	flags.BoolVar(&lineMode, "line", false, "show servers as one-by-one line blocks")
-	flags.BoolVar(&sheetMode, "sheet", false, "show servers in the sheet/table layout")
 	flags.String("config", cfgPath, "config file path")
 	flags.Usage = printHelp
 	if err := flags.Parse(args); err != nil {
-		fatal(err)
+		return err
 	}
 	if flags.NArg() > 0 {
 		usageError(fmt.Errorf("unexpected argument %q", flags.Arg(0)))
 	}
 	if realtimePoints < 0 {
-		fatal(fmt.Errorf("--realtime-points must be 0 or a positive number"))
+		return fmt.Errorf("--realtime-points must be 0 or a positive number")
 	}
 	chartYAxis = strings.ToLower(strings.TrimSpace(chartYAxis))
 	if chartYAxis != "absolute" && chartYAxis != "relative" {
-		fatal(fmt.Errorf("--chart-y-axis must be absolute or relative"))
+		return fmt.Errorf("--chart-y-axis must be absolute or relative")
 	}
 
-	mode := tui.ModeSheet
-	if cfg.Mode == "line" {
-		mode = tui.ModeLine
-	}
-	if lineMode && sheetMode {
-		fatal(fmt.Errorf("--line and --sheet cannot be used together"))
-	}
-	if lineMode {
-		mode = tui.ModeLine
-	}
-	if sheetMode {
-		mode = tui.ModeSheet
+	mode, err := parseModeFlag(modeValue)
+	if err != nil {
+		return err
 	}
 	baseURL, apiKey, err = prepareConnectionConfig(cfg, baseURL, apiKey, os.Stdin, os.Stdout)
 	if err != nil {
-		fatal(err)
+		return err
 	}
 
 	client, err := komari.NewClientWithOptions(baseURL, komari.Options{APIKey: apiKey, Timeout: timeout})
 	if err != nil {
-		fatal(err)
-	}
-
-	if once {
-		ctx, cancel := context.WithTimeout(context.Background(), timeout)
-		defer cancel()
-		snapshot, err := client.Snapshot(ctx)
-		if err != nil {
-			fatal(err)
-		}
-		printSummary(snapshot)
-		return
+		return err
 	}
 
 	if err := checkSystemClockBeforeTUI(client, timeout); err != nil {
-		fatal(err)
+		return err
 	}
 
 	app := tui.NewWithOptions(client, tui.Options{
@@ -176,12 +156,74 @@ func main() {
 		WarnExpiryDays:    cfg.WarnExpiryDays,
 		SaveSettings:      saveTUISettings,
 		CheckUpdate:       checkSoftwareUpdate,
+		CheckKomariUpdate: checkKomariServerUpdate,
+		Version:           version,
+		Commit:            commit,
+		BuildDate:         date,
 		ASCII:             ascii,
 		NoColor:           noColor,
 		Mode:              mode,
 	})
 	if err := app.Run(context.Background()); err != nil && err != context.Canceled {
-		fatal(err)
+		return err
+	}
+	return nil
+}
+
+func handleStatus(args []string) error {
+	cfg, cfgPath, err := loadEffectiveConfig()
+	if err != nil {
+		return err
+	}
+	timeoutDefault, err := cfg.TimeoutDuration()
+	if err != nil {
+		return err
+	}
+
+	var (
+		baseURL string
+		apiKey  string
+		timeout time.Duration
+	)
+	fs := flag.NewFlagSet("ktui status", flag.ExitOnError)
+	fs.StringVar(&baseURL, "url", cfg.URL, "Komari base URL")
+	fs.StringVar(&apiKey, "api-key", cfg.APIKey, "Komari API key (sent as Bearer token)")
+	fs.DurationVar(&timeout, "timeout", timeoutDefault, "HTTP timeout")
+	fs.String("config", cfgPath, "config file path")
+	fs.Usage = printStatusHelp
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+	if fs.NArg() > 0 {
+		return fmt.Errorf("unexpected status argument %q", fs.Arg(0))
+	}
+
+	baseURL, apiKey, err = prepareConnectionConfig(cfg, baseURL, apiKey, os.Stdin, os.Stdout)
+	if err != nil {
+		return err
+	}
+	client, err := komari.NewClientWithOptions(baseURL, komari.Options{APIKey: apiKey, Timeout: timeout})
+	if err != nil {
+		return err
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	snapshot, err := client.Snapshot(ctx)
+	if err != nil {
+		return err
+	}
+	printSummary(snapshot)
+	return nil
+}
+
+func parseModeFlag(value string) (tui.Mode, error) {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case "sheet":
+		return tui.ModeSheet, nil
+	case "line":
+		return tui.ModeLine, nil
+	default:
+		return "", fmt.Errorf("--mode must be sheet or line")
 	}
 }
 
@@ -429,6 +471,23 @@ func checkSoftwareUpdate(ctx context.Context) (tui.UpdateCheckResult, error) {
 	}, nil
 }
 
+func checkKomariServerUpdate(ctx context.Context, currentVersion string) (tui.KomariUpdateCheckResult, error) {
+	result, err := komari.CheckServerUpdate(ctx, komari.ServerUpdateOptions{
+		CurrentVersion: currentVersion,
+		Timeout:        8 * time.Second,
+	})
+	if err != nil {
+		return tui.KomariUpdateCheckResult{}, err
+	}
+	return tui.KomariUpdateCheckResult{
+		CurrentVersion: result.CurrentVersion,
+		LatestVersion:  result.LatestVersion,
+		ReleaseURL:     result.ReleaseURL,
+		ReleaseCount:   result.ReleaseCount,
+		Available:      result.Available,
+	}, nil
+}
+
 func handleConfig(args []string) error {
 	if len(args) == 0 {
 		printConfigHelp()
@@ -506,13 +565,15 @@ func handleConfig(args []string) error {
 
 func handleHelp(args []string) error {
 	if len(args) > 1 {
-		return fmt.Errorf("usage: ktui help [config|keys|update|export]")
+		return fmt.Errorf("usage: ktui help [status|config|keys|update|export]")
 	}
 	if len(args) == 0 {
 		printHelp()
 		return nil
 	}
 	switch args[0] {
+	case "status":
+		printStatusHelp()
 	case "config":
 		printConfigHelp()
 	case "keys":
@@ -528,11 +589,28 @@ func handleHelp(args []string) error {
 }
 
 func handleUpdate(args []string) error {
-	fs := flag.NewFlagSet("ktui update", flag.ExitOnError)
-	checkOnly := fs.Bool("check", false, "check whether an update is available without installing it")
-	targetTag := fs.String("tag", "", "install a specific release tag instead of the latest release")
+	if len(args) == 0 || args[0] == "help" || args[0] == "--help" || args[0] == "-h" {
+		printUpdateHelp()
+		return nil
+	}
+	switch args[0] {
+	case "check":
+		return runUpdateCommand("check", args[1:], true)
+	case "install":
+		return runUpdateCommand("install", args[1:], false)
+	default:
+		return fmt.Errorf("unknown update command %q", args[0])
+	}
+}
+
+func runUpdateCommand(name string, args []string, checkOnly bool) error {
+	fs := flag.NewFlagSet("ktui update "+name, flag.ExitOnError)
+	targetTag := ""
 	apiURL := fs.String("api-url", update.DefaultAPIBaseURL, "Gitea repository API URL")
 	timeout := fs.Duration("timeout", 60*time.Second, "update HTTP timeout")
+	if !checkOnly {
+		fs.StringVar(&targetTag, "tag", "", "install a specific release tag instead of the latest release")
+	}
 	fs.Usage = printUpdateHelp
 	if err := fs.Parse(args); err != nil {
 		return err
@@ -543,8 +621,8 @@ func handleUpdate(args []string) error {
 	return update.Run(context.Background(), update.Options{
 		APIBaseURL:     *apiURL,
 		CurrentVersion: version,
-		TargetVersion:  *targetTag,
-		CheckOnly:      *checkOnly,
+		TargetVersion:  targetTag,
+		CheckOnly:      checkOnly,
 		Timeout:        *timeout,
 		Stdout:         os.Stdout,
 	})
@@ -558,34 +636,37 @@ const helpText = `ktui - Komari terminal UI
 
 Usage:
   ktui [flags]
+  ktui status [flags]
+  ktui export <markdown|csv|json> [flags]
+  ktui config <init|path|show|set|help>
+  ktui update <check|install>
   ktui version
-  ktui update [--check] [--tag v0.1.0]
-  ktui export <json|csv|markdown> [--output PATH]
-  ktui config <path|init|show|set|help>
-  ktui help [config|keys|update|export]
+  ktui help [status|config|keys|update|export]
 
-Flags:
+Connection flags:
   --url URL          Komari base URL
   --api-key KEY     Komari API key, sent as a Bearer token
-  --interval 5s     refresh interval
   --timeout 10s     HTTP timeout
+  --config PATH     config file path
+
+TUI flags:
+  --interval 5s     refresh interval
+  --mode MODE       view mode: sheet or line
   --realtime-points N
                    realtime chart sample limit, 0 auto
   --chart-y-axis MODE
                    percent chart Y axis mode: absolute or relative
-  --sheet           show the boxed sheet layout
-  --line            show one server block after another
   --ascii           use ASCII-only rendering
   --no-color        disable ANSI color
-  --once            fetch once and print a summary
-  --config PATH     config file path
 
 Examples:
   ktui
-  ktui --sheet
-  ktui --line --ascii --no-color
+  ktui --mode sheet
+  ktui --mode line --ascii --no-color
+  ktui status
   ktui version
-  ktui update --check
+  ktui update check
+  ktui update install
   ktui export markdown
   ktui export csv --output nodes.csv
   ktui config init
@@ -599,28 +680,48 @@ func printVersion() {
 	fmt.Printf("built:  %s\n", date)
 }
 
+func printStatusHelp() {
+	fmt.Print(`ktui status - fetch once and print a node summary
+
+Usage:
+  ktui status [flags]
+
+Flags:
+  --url URL          Komari base URL
+  --api-key KEY     Komari API key, sent as a Bearer token
+  --timeout 10s     HTTP timeout
+  --config PATH     config file path
+
+Examples:
+  ktui status
+  ktui status --url https://komari.example.com
+`)
+}
+
 func printUpdateHelp() {
 	fmt.Printf(`ktui update - update ktui from Gitea Releases
 
 Usage:
-  ktui update [flags]
+  ktui update check [flags]
+  ktui update install [flags]
 
 Flags:
-  --check          check for an update without installing it
-  --tag TAG        install a specific release tag, for example v0.1.0
   --api-url URL    Gitea repository API URL
   --timeout 60s    HTTP timeout
 
+Install flags:
+  --tag TAG        install a specific release tag, for example v0.1.0
+
 Default API URL:
   %s
 
 Examples:
-  ktui update --check
-  ktui update
-  ktui update --tag v0.1.0
+  ktui update check
+  ktui update install
+  ktui update install --tag v0.1.0
 
 Private repositories:
-  KTUI_UPDATE_TOKEN=your_token ktui update
+  KTUI_UPDATE_TOKEN=your_token ktui update install
 `, update.DefaultAPIBaseURL)
 }
 
@@ -690,7 +791,8 @@ List layer:
   r                  refresh now
   d                  open or reload selected server detail data
   a                  toggle ASCII compatibility mode
-  u                  show update command when an update is available
+  ?                  open about
+  u                  show available update details
   q, Ctrl-C          quit
 
 Detail layer:
@@ -705,7 +807,8 @@ Detail layer:
   Mouse click        switch tabs or time window
   Footer click       back/tabs/window/scroll/settings/refresh
   s                  open settings
-  u                  show update command when an update is available
+  ?                  open about
+  u                  show available update details
   PgUp, PgDn         scroll faster
 
 Chart focus:
@@ -721,8 +824,16 @@ Settings layer:
   Footer click       back/adjust/toggle
   Left/h, Right/l    adjust value
   Enter              toggle or advance value
+  ?                  open about
   url/api_key        shown as read-only
 
+About:
+  Esc, q, ?          return to previous layer
+  Up/k, Down/j       scroll
+  PgUp, PgDn         scroll faster
+  r                  refresh now
+  u                  show available update details
+
 Search:
   Type text          match node name, region, tags, group, IP, OS, UUID
   Backspace          delete one character

cmd/ktui/main_test.go

@@ -48,14 +48,57 @@ func TestLooksLikeCommand(t *testing.T) {
 	if !looksLikeCommand("add") {
 		t.Fatal("add should look like a command")
 	}
-	if looksLikeCommand("--sheet") {
-		t.Fatal("--sheet should not look like a command")
+	if looksLikeCommand("--mode") {
+		t.Fatal("--mode should not look like a command")
 	}
 	if looksLikeCommand("") {
 		t.Fatal("empty string should not look like a command")
 	}
 }
 
+func TestHelpTextUsesRefactoredCommands(t *testing.T) {
+	for _, want := range []string{
+		"ktui status [flags]",
+		"ktui export <markdown|csv|json> [flags]",
+		"ktui update <check|install>",
+		"--mode MODE",
+		"ktui update check",
+		"ktui update install",
+	} {
+		if !strings.Contains(helpText, want) {
+			t.Fatalf("help text missing %q:\n%s", want, helpText)
+		}
+	}
+	for _, old := range []string{
+		"--once",
+		"--line",
+		"--sheet",
+		"ktui update --check",
+	} {
+		if strings.Contains(helpText, old) {
+			t.Fatalf("help text still contains old command %q:\n%s", old, helpText)
+		}
+	}
+}
+
+func TestParseModeFlag(t *testing.T) {
+	for _, value := range []string{"sheet", " line "} {
+		if _, err := parseModeFlag(value); err != nil {
+			t.Fatalf("parseModeFlag(%q) error = %v", value, err)
+		}
+	}
+	if _, err := parseModeFlag("grid"); err == nil {
+		t.Fatal("expected invalid mode to fail")
+	}
+}
+
+func TestHandleUpdateRejectsOldFlagSyntax(t *testing.T) {
+	err := handleUpdate([]string{"--check"})
+	if err == nil || !strings.Contains(err.Error(), "unknown update command") {
+		t.Fatalf("handleUpdate old syntax error = %v", err)
+	}
+}
+
 func TestKeysHelpTextFormattingAndFooterActions(t *testing.T) {
 	help := keysHelpText()
 	if strings.Contains(help, "\t") {
@@ -64,6 +107,8 @@ func TestKeysHelpTextFormattingAndFooterActions(t *testing.T) {
 	for _, want := range []string{
 		"Footer click       back/tabs/window/scroll/settings/refresh",
 		"Footer click       back/previous/next/window/refresh",
+		"About:",
+		"?                  open about",
 		"url/api_key        shown as read-only",
 	} {
 		if !strings.Contains(help, want) {

internal/komari/server_update.go

@@ -0,0 +1,160 @@
+package komari
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const DefaultServerReleaseAPIURL = "https://api.github.com/repos/komari-monitor/komari/releases?per_page=100"
+
+type ServerUpdateOptions struct {
+	CurrentVersion string
+	APIURL         string
+	Timeout        time.Duration
+	HTTPClient     *http.Client
+}
+
+type ServerUpdateResult struct {
+	CurrentVersion string
+	LatestVersion  string
+	LatestName     string
+	ReleaseURL     string
+	PublishedAt    string
+	ReleaseCount   int
+	Available      bool
+}
+
+type serverRelease struct {
+	TagName    string `json:"tag_name"`
+	Name       string `json:"name"`
+	Body       string `json:"body"`
+	HTMLURL    string `json:"html_url"`
+	Published  string `json:"published_at"`
+	Draft      bool   `json:"draft"`
+	Prerelease bool   `json:"prerelease"`
+}
+
+var semverPrefixRE = regexp.MustCompile(`^(\d+)\.(\d+)\.(\d+)`)
+
+func CheckServerUpdate(ctx context.Context, opts ServerUpdateOptions) (ServerUpdateResult, error) {
+	if opts.APIURL == "" {
+		opts.APIURL = DefaultServerReleaseAPIURL
+	}
+	if opts.Timeout <= 0 {
+		opts.Timeout = 10 * time.Second
+	}
+	client := opts.HTTPClient
+	if client == nil {
+		client = &http.Client{Timeout: opts.Timeout}
+	}
+
+	current := strings.TrimSpace(opts.CurrentVersion)
+	result := ServerUpdateResult{CurrentVersion: current}
+	if current == "" {
+		return result, nil
+	}
+
+	ctx, cancel := context.WithTimeout(ctx, opts.Timeout)
+	defer cancel()
+
+	releases, err := fetchServerReleases(ctx, client, opts.APIURL)
+	if err != nil {
+		return ServerUpdateResult{}, err
+	}
+	for _, rel := range releases {
+		if rel.Draft || rel.Prerelease {
+			continue
+		}
+		version := valueOrString(rel.TagName, rel.Name)
+		if !serverVersionIsNewer(version, current) {
+			continue
+		}
+		if !result.Available {
+			result.LatestVersion = version
+			result.LatestName = rel.Name
+			result.ReleaseURL = rel.HTMLURL
+			result.PublishedAt = rel.Published
+			result.Available = true
+		}
+		result.ReleaseCount++
+	}
+	return result, nil
+}
+
+func fetchServerReleases(ctx context.Context, client *http.Client, endpoint string) ([]serverRelease, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Accept", "application/vnd.github+json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
+		return nil, fmt.Errorf("GET %s: HTTP %d: %s", endpoint, resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+
+	var releases []serverRelease
+	if err := json.NewDecoder(resp.Body).Decode(&releases); err != nil {
+		return nil, err
+	}
+	return releases, nil
+}
+
+func serverVersionIsNewer(latest string, current string) bool {
+	next, ok := parseServerSemver(latest)
+	if !ok {
+		return false
+	}
+	base, ok := parseServerSemver(current)
+	if !ok {
+		return false
+	}
+	for i := 0; i < len(next); i++ {
+		if next[i] > base[i] {
+			return true
+		}
+		if next[i] < base[i] {
+			return false
+		}
+	}
+	return false
+}
+
+func parseServerSemver(value string) ([3]int, bool) {
+	value = strings.TrimSpace(value)
+	value = strings.TrimPrefix(value, "v")
+	value = strings.TrimPrefix(value, "V")
+	match := semverPrefixRE.FindStringSubmatch(value)
+	if match == nil {
+		return [3]int{}, false
+	}
+	var version [3]int
+	for i := range version {
+		parsed, err := strconv.Atoi(match[i+1])
+		if err != nil {
+			return [3]int{}, false
+		}
+		version[i] = parsed
+	}
+	return version, true
+}
+
+func valueOrString(value string, fallback string) string {
+	if strings.TrimSpace(value) != "" {
+		return value
+	}
+	return fallback
+}

internal/komari/server_update_test.go

@@ -0,0 +1,96 @@
+package komari
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestServerVersionIsNewer(t *testing.T) {
+	tests := []struct {
+		latest  string
+		current string
+		want    bool
+	}{
+		{latest: "v1.2.4", current: "1.2.3", want: true},
+		{latest: "1.3.0", current: "v1.2.9", want: true},
+		{latest: "1.2.3", current: "1.2.3", want: false},
+		{latest: "1.2.2", current: "1.2.3", want: false},
+		{latest: "nightly", current: "1.2.3", want: false},
+		{latest: "1.2.4-beta", current: "1.2.3", want: true},
+	}
+	for _, tt := range tests {
+		if got := serverVersionIsNewer(tt.latest, tt.current); got != tt.want {
+			t.Fatalf("serverVersionIsNewer(%q, %q) = %t, want %t", tt.latest, tt.current, got, tt.want)
+		}
+	}
+}
+
+func TestCheckServerUpdateFiltersStableReleases(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Accept") != "application/vnd.github+json" {
+			t.Errorf("Accept = %q", r.Header.Get("Accept"))
+		}
+		releases := []serverRelease{
+			{TagName: "v1.3.0-beta", Name: "beta", Prerelease: true, HTMLURL: "https://example.com/beta"},
+			{TagName: "v1.2.5", Name: "v1.2.5", HTMLURL: "https://example.com/v1.2.5", Published: "2026-07-06T00:00:00Z"},
+			{TagName: "v1.2.4", Name: "v1.2.4", HTMLURL: "https://example.com/v1.2.4"},
+			{TagName: "v1.2.3", Name: "v1.2.3", HTMLURL: "https://example.com/v1.2.3"},
+			{TagName: "v1.2.6", Name: "draft", Draft: true, HTMLURL: "https://example.com/draft"},
+		}
+		_ = json.NewEncoder(w).Encode(releases)
+	}))
+	defer server.Close()
+
+	result, err := CheckServerUpdate(context.Background(), ServerUpdateOptions{
+		CurrentVersion: "v1.2.3",
+		APIURL:         server.URL,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !result.Available || result.LatestVersion != "v1.2.5" || result.ReleaseCount != 2 {
+		t.Fatalf("result = %+v, want latest v1.2.5 with two stable releases", result)
+	}
+	if result.ReleaseURL != "https://example.com/v1.2.5" || result.PublishedAt == "" {
+		t.Fatalf("result = %+v, want release metadata", result)
+	}
+}
+
+func TestCheckServerUpdateReturnsUnavailableForCurrentVersion(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_ = json.NewEncoder(w).Encode([]serverRelease{
+			{TagName: "v1.2.3", Name: "v1.2.3"},
+			{TagName: "v1.2.2", Name: "v1.2.2"},
+		})
+	}))
+	defer server.Close()
+
+	result, err := CheckServerUpdate(context.Background(), ServerUpdateOptions{
+		CurrentVersion: "1.2.3",
+		APIURL:         server.URL,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if result.Available || result.ReleaseCount != 0 {
+		t.Fatalf("result = %+v, want no update", result)
+	}
+}
+
+func TestCheckServerUpdateReportsHTTPError(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, "rate limited", http.StatusForbidden)
+	}))
+	defer server.Close()
+
+	_, err := CheckServerUpdate(context.Background(), ServerUpdateOptions{
+		CurrentVersion: "1.2.3",
+		APIURL:         server.URL,
+	})
+	if err == nil {
+		t.Fatal("expected HTTP error")
+	}
+}

internal/tui/about.go

@@ -0,0 +1,188 @@
+package tui
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+)
+
+func (a *App) renderAboutBody(width int, bodyHeight int) []string {
+	if bodyHeight <= 0 {
+		return nil
+	}
+	content := a.aboutContentLines(width)
+	contentWidth := scrollContentWidth(width, scrollIndicator{
+		Start:   0,
+		Height:  bodyHeight,
+		Offset:  a.aboutScroll,
+		Visible: bodyHeight,
+		Total:   len(content),
+	})
+	if contentWidth != width {
+		content = a.aboutContentLines(contentWidth)
+	}
+
+	maxScroll := len(content) - bodyHeight
+	if maxScroll < 0 {
+		maxScroll = 0
+	}
+	if a.aboutScroll > maxScroll {
+		a.aboutScroll = maxScroll
+	}
+	if a.aboutScroll < 0 {
+		a.aboutScroll = 0
+	}
+
+	end := min(len(content), a.aboutScroll+bodyHeight)
+	lines := make([]string, 0, bodyHeight)
+	lines = append(lines, content[a.aboutScroll:end]...)
+	lines = fillBody(lines, contentWidth, bodyHeight)
+	return a.withScrollIndicator(lines, width, scrollIndicator{
+		Start:   0,
+		Height:  bodyHeight,
+		Offset:  a.aboutScroll,
+		Visible: bodyHeight,
+		Total:   len(content),
+	})
+}
+
+func (a *App) aboutContentLines(width int) []string {
+	lines := make([]string, 0, 36)
+	addSection := func(title string) {
+		if len(lines) > 0 {
+			lines = append(lines, "")
+		}
+		lines = append(lines, a.style.bold(fitLine(" "+title, width)))
+	}
+	addKV := func(label string, value string) {
+		lines = append(lines, a.aboutKVLine(label, value, width))
+	}
+
+	addSection("ktui")
+	addKV("version", valueOr(a.appVersion, "dev"))
+	addKV("commit", valueOr(a.appCommit, "none"))
+	addKV("built", valueOr(a.appBuildDate, "unknown"))
+	addKV("runtime", runtime.Version())
+	addKV("platform", runtime.GOOS+"/"+runtime.GOARCH)
+
+	addSection("Komari")
+	addKV("site", valueOr(a.text(a.snapshot.Public.SiteName), "-"))
+	addKV("url", valueOr(a.settingsURL, valueOr(a.snapshot.SourceURL, "-")))
+	addKV("auth", a.authText())
+	addKV("version", valueOr(a.snapshot.Version.Version, "-"))
+	addKV("hash", valueOr(a.snapshot.Version.Hash, "-"))
+	addKV("rpc", valueOr(a.snapshot.RPCVersion, "-"))
+	addKV("nodes", fmt.Sprintf("%d/%d online", a.snapshot.Online, a.snapshot.Total))
+
+	addSection("Connection")
+	addKV("api_key", configuredText(a.settingsAPIKey))
+	addKV("interval", a.refreshInterval.String())
+	addKV("timeout", a.fetchTimeout.String())
+	addKV("last_refresh", shortTime(a.snapshot.FetchedAt))
+	addKV("status", a.aboutStatusText())
+
+	addSection("Display")
+	addKV("view_mode", string(a.mode))
+	addKV("ascii", boolText(a.style.ASCII))
+	addKV("no_color", boolText(a.style.NoColor))
+	addKV("chart_y_axis", a.chartYAxisModeText())
+	addKV("realtime_points", a.realtimePointsText())
+	addKV("warnings", fmt.Sprintf("cpu %.0f%%  ram %.0f%%  disk %.0f%%  expiry %dd", a.warnCPU, a.warnRAM, a.warnDisk, a.warnExpiryDays))
+
+	addSection("ktui Update")
+	addKV("status", a.aboutUpdateText())
+	if a.update.Latest != "" {
+		addKV("latest", a.update.Latest)
+	}
+	if a.update.AssetName != "" {
+		addKV("asset", a.update.AssetName)
+	}
+
+	addSection("Komari Update")
+	addKV("status", a.aboutKomariUpdateText())
+	if a.komariUpdate.Current != "" {
+		addKV("current", a.komariUpdate.Current)
+	}
+	if a.komariUpdate.Latest != "" {
+		addKV("latest", a.komariUpdate.Latest)
+	}
+	if a.komariUpdate.ReleaseCount > 0 {
+		addKV("releases", fmt.Sprintf("%d newer", a.komariUpdate.ReleaseCount))
+	}
+	if a.komariUpdate.ReleaseURL != "" {
+		addKV("github", a.komariUpdate.ReleaseURL)
+	}
+
+	addSection("Commands")
+	for _, command := range []string{
+		"ktui version",
+		"ktui status",
+		"ktui update check",
+		"ktui help keys",
+	} {
+		lines = append(lines, fitLine(" "+command, width))
+	}
+	return lines
+}
+
+func (a *App) aboutKVLine(label string, value string, width int) string {
+	label = strings.TrimSpace(label)
+	value = strings.TrimSpace(value)
+	if value == "" {
+		value = "-"
+	}
+	prefix := fmt.Sprintf(" %-15s", label)
+	return fitLine(a.style.dim(prefix)+value, width)
+}
+
+func (a *App) aboutStatusText() string {
+	switch {
+	case a.loading:
+		return "loading"
+	case a.fetching:
+		return "refreshing"
+	case a.err != nil:
+		return "error: " + a.err.Error()
+	default:
+		return "ready"
+	}
+}
+
+func (a *App) aboutUpdateText() string {
+	switch {
+	case a.update.Checking:
+		return "checking"
+	case a.update.Err != nil:
+		return "check failed: " + a.update.Err.Error()
+	case a.update.Available:
+		return "available"
+	case a.update.Checked:
+		return "up to date"
+	default:
+		return "not checked"
+	}
+}
+
+func (a *App) aboutKomariUpdateText() string {
+	switch {
+	case a.komariUpdate.Checking:
+		return "checking"
+	case a.komariUpdate.Err != nil:
+		return "check failed: " + a.komariUpdate.Err.Error()
+	case a.komariUpdate.Available:
+		return "available"
+	case a.komariUpdate.Checked:
+		return "up to date"
+	case strings.TrimSpace(a.snapshot.Version.Version) == "":
+		return "waiting for server version"
+	default:
+		return "not checked"
+	}
+}
+
+func configuredText(value string) string {
+	if strings.TrimSpace(value) == "" {
+		return "not configured"
+	}
+	return "configured"
+}

internal/tui/about_test.go

@@ -0,0 +1,134 @@
+package tui
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"ktui/internal/komari"
+)
+
+func TestAboutKeyOpensAndRendersAboutPage(t *testing.T) {
+	keys := parseKeys([]byte("?"))
+	if len(keys) != 1 || keys[0].name != "about" || keys[0].text != "?" {
+		t.Fatalf("keys = %#v, want about key with text", keys)
+	}
+
+	app := NewWithOptions(nil, Options{
+		URL:       "https://komari.example.com",
+		APIKey:    "secret-token",
+		Version:   "v1.2.3",
+		Commit:    "abc123",
+		BuildDate: "2026-07-06",
+		ASCII:     true,
+		NoColor:   true,
+	})
+	app.snapshot = komari.Snapshot{
+		SourceURL:  "https://snapshot.example.com",
+		Online:     1,
+		Total:      2,
+		Version:    komari.VersionInfo{Version: "1.0.0", Hash: "hash"},
+		RPCVersion: "2.0",
+		Public:     komari.PublicInfo{SiteName: "Lab"},
+	}
+	app.komariUpdate = komariUpdateState{
+		Checked:      true,
+		Available:    true,
+		Current:      "1.0.0",
+		Latest:       "1.1.0",
+		ReleaseURL:   "https://github.com/komari-monitor/komari/releases/tag/v1.1.0",
+		ReleaseCount: 1,
+	}
+
+	app.handleKey(context.Background(), keys[0])
+	if !app.about {
+		t.Fatal("about page was not opened")
+	}
+
+	lines := app.renderAboutBody(100, 60)
+	joined := strings.Join(lines, "\n")
+	for _, want := range []string{
+		"ktui",
+		"v1.2.3",
+		"abc123",
+		"2026-07-06",
+		"Komari",
+		"Lab",
+		"https://komari.example.com",
+		"configured",
+		"1/2 online",
+		"Komari Update",
+		"1.1.0",
+		"https://github.com/komari-monitor/komari/releases/tag/v1.1.0",
+		"ktui help keys",
+	} {
+		if !strings.Contains(joined, want) {
+			t.Fatalf("about body missing %q:\n%s", want, joined)
+		}
+	}
+	if strings.Contains(joined, "secret-token") {
+		t.Fatalf("about body leaked API key:\n%s", joined)
+	}
+}
+
+func TestSearchCanTypeQuestionMark(t *testing.T) {
+	app := NewWithOptions(nil, Options{})
+	app.searchEditing = true
+
+	app.handleKey(context.Background(), keyEvent{name: "about", text: "?"})
+	if app.about {
+		t.Fatal("about key event should be treated as text while search is editing")
+	}
+	if app.searchDraft != "?" {
+		t.Fatalf("searchDraft = %q, want ?", app.searchDraft)
+	}
+}
+
+func TestAboutBackRestoresPreviousLayer(t *testing.T) {
+	app := NewWithOptions(nil, Options{})
+	app.detail = true
+	app.chartFocus = true
+
+	app.handleKey(context.Background(), keyEvent{name: "about", text: "?"})
+	if !app.about || app.detail || app.chartFocus {
+		t.Fatalf("about=%t detail=%t chart=%t, want about only", app.about, app.detail, app.chartFocus)
+	}
+
+	app.handleAboutKey(keyEvent{name: "back"})
+	if app.about || !app.detail || !app.chartFocus {
+		t.Fatalf("about=%t detail=%t chart=%t, want detail chart restored", app.about, app.detail, app.chartFocus)
+	}
+
+	app.settings = true
+	app.handleKey(context.Background(), keyEvent{name: "about", text: "?"})
+	app.handleAboutKey(keyEvent{name: "quit"})
+	if app.about || !app.settings {
+		t.Fatalf("about=%t settings=%t, want settings restored", app.about, app.settings)
+	}
+}
+
+func TestAboutScrollAndFooterActions(t *testing.T) {
+	app := NewWithOptions(nil, Options{ASCII: true, NoColor: true})
+	app.about = true
+
+	app.handleAboutKey(keyEvent{name: "down"})
+	if app.aboutScroll != 1 {
+		t.Fatalf("aboutScroll = %d, want 1", app.aboutScroll)
+	}
+	app.handleAboutKey(keyEvent{name: "up"})
+	if app.aboutScroll != 0 {
+		t.Fatalf("aboutScroll = %d, want clamped 0", app.aboutScroll)
+	}
+
+	_, height := terminalSize()
+	x, ok := footerActionPosition(app, footerRefresh)
+	if !ok {
+		t.Fatalf("missing refresh footer action in %q", app.footerText())
+	}
+	app.handleKey(context.Background(), keyEvent{name: "mouse-left", x: x, y: height})
+	select {
+	case <-app.refreshCh:
+	default:
+		t.Fatal("clicking about refresh footer action should request refresh")
+	}
+}

internal/tui/app.go

@@ -3,6 +3,7 @@ package tui
 import (
 	"context"
 	"fmt"
+	"strings"
 	"time"
 
 	"ktui/internal/komari"
@@ -17,6 +18,10 @@ type App struct {
 	realtimePoints    int
 	saveSettings      func(PersistentSettings) error
 	checkUpdate       func(context.Context) (UpdateCheckResult, error)
+	checkKomariUpdate func(context.Context, string) (KomariUpdateCheckResult, error)
+	appVersion        string
+	appCommit         string
+	appBuildDate      string
 	style             Style
 	mode              Mode
 
@@ -24,18 +29,23 @@ type App struct {
 	listScroll        int
 	detailScroll      int
 	settingsScroll    int
+	aboutScroll       int
 	tab               int
 	window            int
 	detail            bool
 	chartFocus        bool
 	chartFocusIndex   int
 	settings          bool
+	about             bool
 	cardStep          int
 	settingsWasDetail bool
 	settingsSelected  int
 	settingsStatus    string
 	settingsURL       string
 	settingsAPIKey    string
+	aboutWasDetail    bool
+	aboutWasSettings  bool
+	aboutWasChart     bool
 	chartYAxisMode    chartYAxisMode
 	warnCPU           float64
 	warnRAM           float64
@@ -59,6 +69,7 @@ type App struct {
 	loading      bool
 	fetching     bool
 	update       updateState
+	komariUpdate komariUpdateState
 	// At most one refresh is queued while an in-flight request is finishing.
 	refreshPending  bool
 	intervalChanged bool
@@ -76,6 +87,7 @@ type App struct {
 	resultCh       chan fetchResult
 	detailCh       chan detailResult
 	updateCh       chan updateResult
+	komariUpdateCh chan komariUpdateResult
 	keyCh          chan keyEvent
 }
 
@@ -94,6 +106,10 @@ type Options struct {
 	WarnExpiryDays    int
 	SaveSettings      func(PersistentSettings) error
 	CheckUpdate       func(context.Context) (UpdateCheckResult, error)
+	CheckKomariUpdate func(context.Context, string) (KomariUpdateCheckResult, error)
+	Version           string
+	Commit            string
+	BuildDate         string
 	ASCII             bool
 	NoColor           bool
 	Mode              Mode
@@ -106,6 +122,14 @@ type UpdateCheckResult struct {
 	Available      bool
 }
 
+type KomariUpdateCheckResult struct {
+	CurrentVersion string
+	LatestVersion  string
+	ReleaseURL     string
+	ReleaseCount   int
+	Available      bool
+}
+
 type PersistentSettings struct {
 	Interval       string
 	Timeout        string
@@ -181,6 +205,11 @@ type updateResult struct {
 	err    error
 }
 
+type komariUpdateResult struct {
+	result KomariUpdateCheckResult
+	err    error
+}
+
 type updateState struct {
 	Checking  bool
 	Checked   bool
@@ -190,6 +219,17 @@ type updateState struct {
 	Err       error
 }
 
+type komariUpdateState struct {
+	Checking     bool
+	Checked      bool
+	Available    bool
+	Current      string
+	Latest       string
+	ReleaseURL   string
+	ReleaseCount int
+	Err          error
+}
+
 type detailKey struct {
 	UUID   string
 	Window int
@@ -278,6 +318,15 @@ func NewWithOptions(client *komari.Client, opts Options) *App {
 	if opts.Mode == "" {
 		opts.Mode = ModeSheet
 	}
+	if opts.Version == "" {
+		opts.Version = "dev"
+	}
+	if opts.Commit == "" {
+		opts.Commit = "none"
+	}
+	if opts.BuildDate == "" {
+		opts.BuildDate = "unknown"
+	}
 	if opts.WarnCPU <= 0 {
 		opts.WarnCPU = 90
 	}
@@ -298,6 +347,10 @@ func NewWithOptions(client *komari.Client, opts Options) *App {
 		detailCacheTTL:    opts.DetailCacheTTL,
 		realtimePoints:    opts.RealtimePoints,
 		checkUpdate:       opts.CheckUpdate,
+		checkKomariUpdate: opts.CheckKomariUpdate,
+		appVersion:        opts.Version,
+		appCommit:         opts.Commit,
+		appBuildDate:      opts.BuildDate,
 		settingsURL:       opts.URL,
 		settingsAPIKey:    opts.APIKey,
 		style:             Style{ASCII: opts.ASCII, NoColor: opts.NoColor},
@@ -313,6 +366,7 @@ func NewWithOptions(client *komari.Client, opts Options) *App {
 		resultCh:          make(chan fetchResult, 2),
 		detailCh:          make(chan detailResult, 4),
 		updateCh:          make(chan updateResult, 1),
+		komariUpdateCh:    make(chan komariUpdateResult, 1),
 		keyCh:             make(chan keyEvent, 16),
 		loading:           true,
 		nodeDetail:        map[detailKey]nodeDetail{},
@@ -378,6 +432,7 @@ func (a *App) Run(ctx context.Context) error {
 				if a.detail {
 					a.ensureSelectedDetail(ctx)
 				}
+				a.maybeStartKomariUpdateCheck(ctx)
 			} else {
 				a.recordRealtimeSample(a.realtimeNowOrTime(time.Now()))
 			}
@@ -401,6 +456,9 @@ func (a *App) Run(ctx context.Context) error {
 				}
 			}
 			a.render()
+		case update := <-a.komariUpdateCh:
+			a.applyKomariUpdateResult(update)
+			a.render()
 		case key := <-a.keyCh:
 			a.handleKey(ctx, key)
 			a.render()
@@ -411,6 +469,52 @@ func (a *App) Run(ctx context.Context) error {
 	return nil
 }
 
+func (a *App) maybeStartKomariUpdateCheck(ctx context.Context) {
+	if a.checkKomariUpdate == nil {
+		return
+	}
+	current := strings.TrimSpace(a.snapshot.Version.Version)
+	if current == "" || a.komariUpdate.Checking {
+		return
+	}
+	if a.komariUpdate.Checked && a.komariUpdate.Current == current {
+		return
+	}
+	a.komariUpdate = komariUpdateState{Checking: true, Current: current}
+	go func() {
+		result, err := a.checkKomariUpdate(ctx, current)
+		select {
+		case a.komariUpdateCh <- komariUpdateResult{result: result, err: err}:
+		case <-ctx.Done():
+		}
+	}()
+}
+
+func (a *App) applyKomariUpdateResult(update komariUpdateResult) {
+	current := update.result.CurrentVersion
+	if strings.TrimSpace(current) == "" {
+		current = a.komariUpdate.Current
+	}
+	a.komariUpdate.Checking = false
+	a.komariUpdate.Checked = true
+	a.komariUpdate.Current = current
+	a.komariUpdate.Err = update.err
+	if update.err != nil {
+		a.komariUpdate.Available = false
+		a.komariUpdate.Latest = ""
+		a.komariUpdate.ReleaseURL = ""
+		a.komariUpdate.ReleaseCount = 0
+		return
+	}
+	a.komariUpdate.Available = update.result.Available
+	a.komariUpdate.Latest = update.result.LatestVersion
+	a.komariUpdate.ReleaseURL = update.result.ReleaseURL
+	a.komariUpdate.ReleaseCount = update.result.ReleaseCount
+	if update.result.Available {
+		a.notice = ""
+	}
+}
+
 func (a *App) startUpdateCheck(ctx context.Context) {
 	if a.checkUpdate == nil {
 		return

internal/tui/app_test.go

@@ -90,8 +90,58 @@ func TestUpdateAvailableFooterAndHint(t *testing.T) {
 	}
 
 	app.handleKey(context.Background(), keyEvent{name: "update-hint"})
-	if !strings.Contains(app.notice, "ktui update") {
-		t.Fatalf("notice = %q, want update command", app.notice)
+	if !strings.Contains(app.notice, "ktui update install") {
+		t.Fatalf("notice = %q, want update details", app.notice)
+	}
+}
+
+func TestKomariServerUpdateAvailableFooterAndHint(t *testing.T) {
+	app := NewWithOptions(nil, Options{})
+	app.komariUpdate.Available = true
+	app.komariUpdate.Current = "v1.2.3"
+	app.komariUpdate.Latest = "v1.2.5"
+	app.komariUpdate.ReleaseURL = "https://github.com/komari-monitor/komari/releases/tag/v1.2.5"
+
+	if !strings.Contains(app.footerText(), "u update") {
+		t.Fatalf("footer = %q, want update action", app.footerText())
+	}
+
+	app.handleKey(context.Background(), keyEvent{name: "update-hint"})
+	if !strings.Contains(app.notice, "Komari server: v1.2.3 -> v1.2.5") {
+		t.Fatalf("notice = %q, want Komari server update", app.notice)
+	}
+	if !strings.Contains(app.updateHeaderText(), "KOMARI UPDATE v1.2.5") {
+		t.Fatalf("header update = %q, want Komari update", app.updateHeaderText())
+	}
+}
+
+func TestMaybeStartKomariUpdateCheckUsesSnapshotVersion(t *testing.T) {
+	seenCurrent := make(chan string, 1)
+	app := NewWithOptions(nil, Options{
+		CheckKomariUpdate: func(ctx context.Context, currentVersion string) (KomariUpdateCheckResult, error) {
+			seenCurrent <- currentVersion
+			return KomariUpdateCheckResult{
+				CurrentVersion: currentVersion,
+				LatestVersion:  "v1.2.5",
+				ReleaseURL:     "https://github.com/komari-monitor/komari/releases/tag/v1.2.5",
+				ReleaseCount:   2,
+				Available:      true,
+			}, nil
+		},
+	})
+	app.snapshot.Version.Version = "v1.2.3"
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	app.maybeStartKomariUpdateCheck(ctx)
+	result := <-app.komariUpdateCh
+	app.applyKomariUpdateResult(result)
+
+	if got := <-seenCurrent; got != "v1.2.3" {
+		t.Fatalf("currentVersion = %q, want v1.2.3", got)
+	}
+	if !app.komariUpdate.Available || app.komariUpdate.Latest != "v1.2.5" || app.komariUpdate.ReleaseCount != 2 {
+		t.Fatalf("komariUpdate = %+v, want available v1.2.5", app.komariUpdate)
 	}
 }
 

internal/tui/frame.go

@@ -118,7 +118,14 @@ func (a *App) headerLines(width int) []string {
 	if query := a.currentSearchQuery(); query != "" || a.searchEditing {
 		contextParts = append([]string{a.headerChip("search", valueOr(query, "-"))}, contextParts...)
 	}
-	if a.settings {
+	if a.about {
+		contextParts = []string{
+			a.headerChip("view", "about"),
+			a.headerChip("ktui", valueOr(a.appVersion, "dev")),
+			a.headerChip("komari", valueOr(a.snapshot.Version.Version, "-")),
+			a.headerChip("rpc", valueOr(a.snapshot.RPCVersion, "-")),
+		}
+	} else if a.settings {
 		contextParts = []string{
 			a.headerChip("view", "settings"),
 			a.headerChip("mode", string(a.mode)+"/"+mode),
@@ -146,9 +153,9 @@ func (a *App) headerLines(width int) []string {
 		context = a.style.red("ERROR " + a.err.Error())
 	} else if a.notice != "" {
 		context = a.style.yellow(a.notice)
-	} else if a.update.Available {
-		context = a.style.yellow(fmt.Sprintf("UPDATE %s available  run `ktui update`", valueOr(a.update.Latest, "latest")))
-	} else if a.update.Checking {
+	} else if updateText := a.updateHeaderText(); updateText != "" {
+		context = a.style.yellow(updateText)
+	} else if a.isCheckingUpdates() {
 		context = a.style.dim("checking for updates...")
 	}
 
@@ -254,6 +261,17 @@ func (a *App) footerItems() []footerItem {
 			{Action: footerNone, Labels: [footerLabelVariants]string{"Backspace delete", "Delete", "Del"}},
 		}
 	}
+	if a.about {
+		items := []footerItem{
+			{Action: footerBack, Labels: [footerLabelVariants]string{"Esc/q back", "Back", "B"}},
+			{Action: footerScroll, Labels: [footerLabelVariants]string{"j/k scroll", "Scroll", "J"}},
+			{Action: footerRefresh, Labels: [footerLabelVariants]string{"r refresh", "Refresh", "R"}},
+		}
+		if a.hasAvailableUpdate() {
+			items = append(items, footerItem{Action: footerUpdate, Labels: [footerLabelVariants]string{"u update", "Update", "U"}})
+		}
+		return items
+	}
 	if a.settings {
 		return []footerItem{
 			{Action: footerBack, Labels: [footerLabelVariants]string{"Esc/q back", "Back", "B"}},
@@ -280,7 +298,7 @@ func (a *App) footerItems() []footerItem {
 			{Action: footerSettings, Labels: [footerLabelVariants]string{"s settings", "Settings", "S"}},
 			{Action: footerRefresh, Labels: [footerLabelVariants]string{"r refresh", "Refresh", "R"}},
 		}
-		if a.update.Available {
+		if a.hasAvailableUpdate() {
 			items = append(items, footerItem{Action: footerUpdate, Labels: [footerLabelVariants]string{"u update", "Update", "U"}})
 		}
 		return items
@@ -297,7 +315,7 @@ func (a *App) footerItems() []footerItem {
 		{Action: footerASCII, Labels: [footerLabelVariants]string{"a ascii", "ASCII", "A"}},
 		{Action: footerQuit, Labels: [footerLabelVariants]string{"q quit", "Quit", "Q"}},
 	}
-	if a.update.Available {
+	if a.hasAvailableUpdate() {
 		items = append(items, footerItem{Action: footerUpdate, Labels: [footerLabelVariants]string{"u update", "Update", "U"}})
 	}
 	return items

internal/tui/keys.go

@@ -86,6 +86,8 @@ func parseKeysWithRemainder(data []byte) ([]keyEvent, []byte) {
 			out = append(out, keyEvent{name: "settings", text: string(data[i])})
 		case 'u', 'U':
 			out = append(out, keyEvent{name: "update-hint", text: string(data[i])})
+		case '?':
+			out = append(out, keyEvent{name: "about", text: string(data[i])})
 		case '/':
 			out = append(out, keyEvent{name: "search", text: "/"})
 		case 'c', 'C':
@@ -266,12 +268,19 @@ func (a *App) handleKey(ctx context.Context, key keyEvent) {
 		if a.settingsScroll < 0 {
 			a.settingsScroll = 0
 		}
+		if a.aboutScroll < 0 {
+			a.aboutScroll = 0
+		}
 		return
 	}
 	if a.searchEditing {
 		a.handleSearchKey(key)
 		return
 	}
+	if a.about {
+		a.handleAboutKey(key)
+		return
+	}
 	if a.settings {
 		a.handleSettingsKey(key)
 		return
@@ -301,6 +310,8 @@ func (a *App) handleKey(ctx context.Context, key keyEvent) {
 		a.openSettings()
 	case "update-hint":
 		a.showUpdateHint()
+	case "about":
+		a.openAbout()
 	case "search":
 		if !a.detail {
 			a.openSearch()
@@ -430,6 +441,9 @@ func (a *App) handleKey(ctx context.Context, key keyEvent) {
 	if a.detailScroll < 0 {
 		a.detailScroll = 0
 	}
+	if a.aboutScroll < 0 {
+		a.aboutScroll = 0
+	}
 	if a.detail && (previous != a.selected || previousTab != a.tab || previousWindow != a.window || a.tabNeedsDetail()) {
 		a.ensureSelectedDetail(ctx)
 	}
@@ -510,6 +524,8 @@ func (a *App) handleSettingsKey(key keyEvent) {
 		a.quit = true
 	case "quit", "back", "settings":
 		a.closeSettings()
+	case "about":
+		a.openAbout()
 	case "up":
 		a.moveSettingsSelection(-1)
 	case "down":
@@ -530,6 +546,34 @@ func (a *App) handleSettingsKey(key keyEvent) {
 	}
 }
 
+func (a *App) handleAboutKey(key keyEvent) {
+	switch key.name {
+	case "force-quit":
+		a.quit = true
+	case "quit", "back", "about":
+		a.closeAbout()
+	case "up":
+		a.aboutScroll--
+	case "down":
+		a.aboutScroll++
+	case "pageup":
+		a.aboutScroll -= 6
+	case "pagedown":
+		a.aboutScroll += 6
+	case "top":
+		a.aboutScroll = 0
+	case "bottom":
+		a.aboutScroll = 1 << 30
+	case "refresh":
+		a.requestFullRefresh()
+	case "update-hint":
+		a.showUpdateHint()
+	}
+	if a.aboutScroll < 0 {
+		a.aboutScroll = 0
+	}
+}
+
 func (a *App) cycleDetailTab(ctx context.Context, delta int) {
 	if len(tabNames) == 0 {
 		return

internal/tui/mouse.go

@@ -32,6 +32,13 @@ func (a *App) handleMouseWheel(ctx context.Context, delta int) {
 	previous := a.selected
 	previousTab := a.tab
 	previousWindow := a.window
+	if a.about {
+		a.aboutScroll += delta * 3
+		if a.aboutScroll < 0 {
+			a.aboutScroll = 0
+		}
+		return
+	}
 	if a.settings {
 		a.moveSettingsSelection(delta)
 		return
@@ -60,6 +67,9 @@ func (a *App) handleMouseClick(ctx context.Context, x int, y int) {
 	if a.clickFooter(ctx, x, y) {
 		return
 	}
+	if a.about {
+		return
+	}
 	if a.settings {
 		a.clickSettings(y)
 		return
@@ -116,6 +126,24 @@ func (a *App) clickFooter(ctx context.Context, x int, y int) bool {
 		}
 		return false
 	}
+	if a.about {
+		switch action {
+		case footerBack:
+			a.closeAbout()
+		case footerScroll:
+			a.aboutScroll += 3
+		case footerRefresh:
+			a.requestFullRefresh()
+		case footerUpdate:
+			a.showUpdateHint()
+		default:
+			return false
+		}
+		if a.aboutScroll < 0 {
+			a.aboutScroll = 0
+		}
+		return true
+	}
 	if a.settings {
 		switch action {
 		case footerBack:
@@ -304,12 +332,34 @@ func (a *App) closeSettings() {
 	a.settingsWasDetail = false
 }
 
+func (a *App) openAbout() {
+	a.aboutWasDetail = a.detail
+	a.aboutWasSettings = a.settings
+	a.aboutWasChart = a.chartFocus
+	a.about = true
+	a.aboutScroll = 0
+	a.settings = false
+	a.detail = false
+	a.chartFocus = false
+	a.notice = ""
+}
+
+func (a *App) closeAbout() {
+	a.about = false
+	a.detail = a.aboutWasDetail
+	a.settings = a.aboutWasSettings
+	a.chartFocus = a.aboutWasChart && a.detail
+	a.aboutWasDetail = false
+	a.aboutWasSettings = false
+	a.aboutWasChart = false
+}
+
 func (a *App) showUpdateHint() {
-	if !a.update.Available {
+	hint := a.updateHintText()
+	if hint == "" {
 		return
 	}
-	latest := valueOr(a.update.Latest, "latest")
-	a.notice = "update available: " + latest + "  quit and run `ktui update`"
+	a.notice = hint
 }
 
 func footerHit(footer string, label string, x int) bool {

internal/tui/render.go

@@ -36,7 +36,9 @@ func (a *App) render() {
 		bodyHeight = 1
 	}
 
-	if a.settings {
+	if a.about {
+		lines = append(lines, a.renderAboutBody(drawWidth, bodyHeight)...)
+	} else if a.settings {
 		lines = append(lines, a.renderSettingsBody(drawWidth, bodyHeight)...)
 	} else if a.detail {
 		lines = append(lines, a.renderDetailBody(drawWidth, bodyHeight)...)

internal/tui/settings.go

@@ -29,6 +29,7 @@ const (
 	settingsWarnRAM
 	settingsWarnDisk
 	settingsWarnExpiryDays
+	settingsAbout
 )
 
 func (a *App) renderSettingsBody(width int, bodyHeight int) []string {
@@ -95,6 +96,7 @@ func (a *App) settingsItems() []settingsItem {
 		{Label: "warn_ram", Value: percentSettingText(a.warnRAM), Kind: settingsWarnRAM},
 		{Label: "warn_disk", Value: percentSettingText(a.warnDisk), Kind: settingsWarnDisk},
 		{Label: "warn_expiry_days", Value: fmt.Sprintf("%d", a.warnExpiryDays), Kind: settingsWarnExpiryDays},
+		{Label: "about", Value: "open", Kind: settingsAbout},
 	}
 }
 
@@ -233,6 +235,9 @@ func (a *App) adjustSelectedSetting(delta int) {
 		a.warnDisk = adjustedPercent(a.warnDisk, delta)
 	case settingsWarnExpiryDays:
 		a.warnExpiryDays = adjustedExpiryDays(a.warnExpiryDays, delta)
+	case settingsAbout:
+		a.openAbout()
+		return
 	}
 	a.persistSettings()
 }

internal/tui/settings_test.go

@@ -23,7 +23,7 @@ func TestSettingsKeyOpensSettingsPage(t *testing.T) {
 
 	lines := app.renderSettingsBody(80, 18)
 	joined := strings.Join(lines, "\n")
-	for _, label := range []string{"url", "api_key", "interval", "timeout", "mode", "realtime_points", "chart_y_axis", "ascii", "no_color", "warn_cpu", "warn_ram", "warn_disk", "warn_expiry_days"} {
+	for _, label := range []string{"url", "api_key", "interval", "timeout", "mode", "realtime_points", "chart_y_axis", "ascii", "no_color", "warn_cpu", "warn_ram", "warn_disk", "warn_expiry_days", "about"} {
 		if !strings.Contains(joined, label) {
 			t.Fatalf("settings body missing %s: %#v", label, lines)
 		}
@@ -37,7 +37,7 @@ func TestSettingsItemsIncludeAllConfigFields(t *testing.T) {
 	for _, item := range items {
 		got = append(got, item.Label)
 	}
-	want := []string{"url", "api_key", "interval", "timeout", "mode", "realtime_points", "chart_y_axis", "ascii", "no_color", "warn_cpu", "warn_ram", "warn_disk", "warn_expiry_days"}
+	want := []string{"url", "api_key", "interval", "timeout", "mode", "realtime_points", "chart_y_axis", "ascii", "no_color", "warn_cpu", "warn_ram", "warn_disk", "warn_expiry_days", "about"}
 	if strings.Join(got, ",") != strings.Join(want, ",") {
 		t.Fatalf("settings labels = %#v, want %#v", got, want)
 	}
@@ -93,6 +93,45 @@ func TestReadOnlySettingsDoNotPersist(t *testing.T) {
 	}
 }
 
+func TestSettingsAboutItemOpensAboutWithoutPersisting(t *testing.T) {
+	called := false
+	app := NewWithOptions(nil, Options{
+		SaveSettings: func(settings PersistentSettings) error {
+			called = true
+			return nil
+		},
+	})
+	app.settings = true
+	selectSetting(t, app, "about")
+
+	app.handleSettingsKey(keyEvent{name: "open"})
+	if called {
+		t.Fatal("about setting should not persist settings")
+	}
+	if !app.about || app.settings {
+		t.Fatalf("about=%t settings=%t, want about open from settings", app.about, app.settings)
+	}
+	app.handleAboutKey(keyEvent{name: "back"})
+	if app.about || !app.settings {
+		t.Fatalf("about=%t settings=%t, want settings restored", app.about, app.settings)
+	}
+}
+
+func TestSettingsAboutReturnPreservesDetailRestore(t *testing.T) {
+	app := NewWithOptions(nil, Options{})
+	app.detail = true
+	app.handleKey(context.Background(), keyEvent{name: "settings"})
+	selectSetting(t, app, "about")
+
+	app.handleSettingsKey(keyEvent{name: "open"})
+	app.handleAboutKey(keyEvent{name: "back"})
+	app.handleSettingsKey(keyEvent{name: "back"})
+
+	if app.about || app.settings || !app.detail {
+		t.Fatalf("about=%t settings=%t detail=%t, want detail restored", app.about, app.settings, app.detail)
+	}
+}
+
 func TestSettingsAdjustConfigFields(t *testing.T) {
 	var saved PersistentSettings
 	app := NewWithOptions(nil, Options{

internal/tui/updates.go

@@ -0,0 +1,44 @@
+package tui
+
+import (
+	"fmt"
+	"strings"
+)
+
+func (a *App) hasAvailableUpdate() bool {
+	return a.update.Available || a.komariUpdate.Available
+}
+
+func (a *App) isCheckingUpdates() bool {
+	return a.update.Checking || a.komariUpdate.Checking
+}
+
+func (a *App) updateHeaderText() string {
+	switch {
+	case a.update.Available && a.komariUpdate.Available:
+		return fmt.Sprintf("UPDATES ktui %s, Komari %s available  press u", valueOr(a.update.Latest, "latest"), valueOr(a.komariUpdate.Latest, "latest"))
+	case a.update.Available:
+		return fmt.Sprintf("KTUI UPDATE %s available  run `ktui update install`", valueOr(a.update.Latest, "latest"))
+	case a.komariUpdate.Available:
+		return fmt.Sprintf("KOMARI UPDATE %s available  press u", valueOr(a.komariUpdate.Latest, "latest"))
+	default:
+		return ""
+	}
+}
+
+func (a *App) updateHintText() string {
+	parts := []string{}
+	if a.update.Available {
+		parts = append(parts, "ktui: "+valueOr(a.update.Latest, "latest")+" available  run `ktui update install`")
+	}
+	if a.komariUpdate.Available {
+		current := valueOr(a.komariUpdate.Current, valueOr(a.snapshot.Version.Version, "current"))
+		latest := valueOr(a.komariUpdate.Latest, "latest")
+		message := "Komari server: " + current + " -> " + latest + "  update from GitHub releases"
+		if a.komariUpdate.ReleaseURL != "" {
+			message += " " + a.komariUpdate.ReleaseURL
+		}
+		parts = append(parts, message)
+	}
+	return strings.Join(parts, "  |  ")
+}