diff --git a/cmd/artex/main.go b/cmd/artex/main.go
index a2b6611..30440d4 100644
--- a/cmd/artex/main.go
+++ b/cmd/artex/main.go
@@ -48,6 +48,10 @@ func main() {
 	)
 	flag.Parse()
 
+	// hand the build version to the server package so GET /api/health can report it
+	// to the frontend top bar.
+	server.BuildVersion = version
+
 	printBanner(*addr)
 
 	// capture backend logs into the in-memory sink (still to stderr) so the /logs
diff --git a/server/server.go b/server/server.go
index c89a5cd..2fff186 100644
--- a/server/server.go
+++ b/server/server.go
@@ -27,6 +27,11 @@ import (
 	"github.com/Autumn-27/norma/transcript"
 )
 
+// BuildVersion is the backend application version, injected from cmd/artex at
+// startup (which in turn gets it from -ldflags "-X main.version=<tag>").
+// Defaults to "dev" for local builds. Exposed to the frontend via GET /api/health.
+var BuildVersion = "dev"
+
 // Server exposes the ARTEX backend over a JSON HTTP API for the shadcn/ui
 // frontend.
 type Server struct {
@@ -741,7 +746,7 @@ func (s *Server) Handler() http.Handler {
 // --- handlers ---
 
 func (s *Server) health(w http.ResponseWriter, r *http.Request) {
-	writeJSON(w, 200, map[string]any{"ok": true, "service": "artex"})
+	writeJSON(w, 200, map[string]any{"ok": true, "service": "artex", "version": BuildVersion})
 }
 
 func (s *Server) stats(w http.ResponseWriter, r *http.Request) {
diff --git a/web/src/app/(main)/_components/main-content.tsx b/web/src/app/(main)/_components/main-content.tsx
index 7524969..8c08bab 100644
--- a/web/src/app/(main)/_components/main-content.tsx
+++ b/web/src/app/(main)/_components/main-content.tsx
@@ -1,11 +1,12 @@
 "use client";
 
-import type { ReactNode } from "react";
+import { type ReactNode, useEffect, useState } from "react";
 
 import { usePathname } from "next/navigation";
 
 import { Separator } from "@/components/ui/separator";
 import { SidebarTrigger } from "@/components/ui/sidebar";
+import { api } from "@/lib/api";
 import { cn } from "@/lib/utils";
 import { useCurrentUser } from "@/hooks/use-current-user";
 
@@ -29,6 +30,14 @@ function isFullBleed(pathname: string) {
 export function MainContent({ children }: { children: ReactNode }) {
   const currentUser = useCurrentUser();
   const pathname = usePathname();
+  const [version, setVersion] = useState("");
+
+  useEffect(() => {
+    api
+      .health()
+      .then((h) => setVersion(h.version ?? ""))
+      .catch(() => setVersion(""));
+  }, []);
 
   if (isFullBleed(pathname)) {
     return <>{children}</>;
@@ -52,6 +61,9 @@ export function MainContent({ children }: { children: ReactNode }) {
             <SearchDialog />
           </div>
           <div className="flex items-center gap-2">
+            {version && (
+              <span className="text-muted-foreground text-xs font-medium tabular-nums">版本·v{version}</span>
+            )}
             <LayoutControls />
             <ThemeSwitcher />
             <AccountSwitcher users={[currentUser]} />
diff --git a/web/src/lib/api.ts b/web/src/lib/api.ts
index c67cb45..92f04ca 100644
--- a/web/src/lib/api.ts
+++ b/web/src/lib/api.ts
@@ -99,6 +99,9 @@ const arr = <T>(x: T[] | null | undefined): T[] => x ?? [];
 const tq = (task?: string, sep: "?" | "&" = "?") => (task ? `${sep}task=${encodeURIComponent(task)}` : "");
 
 export const api = {
+  // 后端应用版本号（release 时由 ldflags 注入，默认 "dev"）。
+  health: () => get<{ ok: boolean; service: string; version: string }>("/health"),
+
   // ---- auth ----
   authStatus: () => get<{ initialized: boolean }>("/auth/status"),
   login: (username: string, password: string) =>