diff --git a/evalscope/service/api_models/common.py b/evalscope/service/api_models/common.py
index 1d22882ce..dd30b9852 100644
--- a/evalscope/service/api_models/common.py
+++ b/evalscope/service/api_models/common.py
@@ -11,6 +11,7 @@ class ApiResponseModel(BaseModel):
 
 class ConfigResponse(ApiResponseModel):
     outputs_root: str
+    version: str
 
 
 class DataFrameResponse(ApiResponseModel):
diff --git a/evalscope/service/app.py b/evalscope/service/app.py
index 6b750faae..453d23150 100644
--- a/evalscope/service/app.py
+++ b/evalscope/service/app.py
@@ -8,6 +8,7 @@
 from flask import Flask, jsonify, send_from_directory
 
 from evalscope.utils.logger import get_logger
+from evalscope.version import __version__
 
 from .api_models import ConfigResponse
 from .blueprints import bp_eval, bp_perf, bp_reports
@@ -67,6 +68,7 @@ def get_config():
             ConfigResponse,
             {
                 'outputs_root': outputs_root or _DEFAULT_ROOT,
+                'version': __version__,
             },
         )
 
diff --git a/evalscope/web/src/api/generated/contracts.schema.json b/evalscope/web/src/api/generated/contracts.schema.json
index c458b83ed..955324053 100644
--- a/evalscope/web/src/api/generated/contracts.schema.json
+++ b/evalscope/web/src/api/generated/contracts.schema.json
@@ -485,10 +485,14 @@
       "properties": {
         "outputs_root": {
           "type": "string"
+        },
+        "version": {
+          "type": "string"
         }
       },
       "required": [
-        "outputs_root"
+        "outputs_root",
+        "version"
       ],
       "type": "object"
     },
diff --git a/evalscope/web/src/api/generated/contracts.ts b/evalscope/web/src/api/generated/contracts.ts
index 6215c576b..79bdda059 100644
--- a/evalscope/web/src/api/generated/contracts.ts
+++ b/evalscope/web/src/api/generated/contracts.ts
@@ -167,6 +167,7 @@ export interface PredictionToolCall {
 }
 export interface ConfigResponse {
   outputs_root: string;
+  version: string;
 }
 export interface DataFrameResponse {
   columns: string[];
diff --git a/evalscope/web/src/components/nav/TopNav.tsx b/evalscope/web/src/components/nav/TopNav.tsx
index b5ee82bf0..43b285311 100644
--- a/evalscope/web/src/components/nav/TopNav.tsx
+++ b/evalscope/web/src/components/nav/TopNav.tsx
@@ -1,6 +1,8 @@
 import { useState } from 'react'
 import { NavLink } from 'react-router-dom'
+import Badge from '@/components/ui/Badge'
 import { useLocale } from '@/contexts/LocaleContext'
+import { useAppConfig } from '@/contexts/ReportsContext'
 import LocaleToggle from './LocaleToggle'
 import ThemeToggle from './ThemeToggle'
 import { BarChart3, Gauge, FlaskConical, BookOpen, FileText, Menu, X } from 'lucide-react'
@@ -28,6 +30,7 @@ const mobileLinkClass = ({ isActive }: { isActive: boolean }) =>
 
 export default function TopNav() {
   const { t } = useLocale()
+  const { config } = useAppConfig()
   const [mobileOpen, setMobileOpen] = useState(false)
 
   const navItems = [
@@ -58,6 +61,11 @@ export default function TopNav() {
             <span className="font-bold text-base tracking-tight text-[var(--text)]">
               Eval<span className="text-[var(--accent)]">Scope</span>
             </span>
+            {config?.version && (
+              <Badge title={`EvalScope version ${config.version}`}>
+                v{config.version}
+              </Badge>
+            )}
           </div>
           {/* Desktop nav — full text, lg+ */}
           <nav className="hidden lg:flex items-center gap-0.5">
diff --git a/evalscope/web/src/components/ui/Badge.tsx b/evalscope/web/src/components/ui/Badge.tsx
index 0fceb9647..167562eed 100644
--- a/evalscope/web/src/components/ui/Badge.tsx
+++ b/evalscope/web/src/components/ui/Badge.tsx
@@ -1,12 +1,11 @@
-import type { ReactNode } from 'react'
+import type { ComponentPropsWithoutRef, ReactNode } from 'react'
 import { cn } from '@/lib/utils'
 
 type BadgeVariant = 'default' | 'success' | 'warning' | 'danger'
 
-interface BadgeProps {
+interface BadgeProps extends ComponentPropsWithoutRef<'span'> {
   children: ReactNode
   variant?: BadgeVariant
-  className?: string
 }
 
 const variantStyles: Record<BadgeVariant, string> = {
@@ -16,7 +15,7 @@ const variantStyles: Record<BadgeVariant, string> = {
   danger: 'bg-[var(--danger-bg)] text-[var(--danger)]',
 }
 
-export default function Badge({ children, variant = 'default', className }: BadgeProps) {
+export default function Badge({ children, variant = 'default', className, ...rest }: BadgeProps) {
   return (
     <span
       className={cn(
@@ -24,6 +23,7 @@ export default function Badge({ children, variant = 'default', className }: Badg
         variantStyles[variant],
         className,
       )}
+      {...rest}
     >
       {children}
     </span>
diff --git a/evalscope/web/src/contexts/ReportsContext.tsx b/evalscope/web/src/contexts/ReportsContext.tsx
index ed1cb7e88..f9f1c2ae9 100644
--- a/evalscope/web/src/contexts/ReportsContext.tsx
+++ b/evalscope/web/src/contexts/ReportsContext.tsx
@@ -13,18 +13,41 @@ import * as reportsApi from '@/api/reports'
 import { apiValidated } from '@/api/client'
 
 /**
- * Report-scoped application state, split into three independent contexts.
- *
- * The three concerns below change at unrelated times, so they are published
- * separately: a compare-selection toggle on the reports list must not re-render
- * the dashboard, and a report landing in the cache must not re-render the
- * scan-path bar. `ReportsProvider` composes all three so callers still mount a
- * single provider.
+ * Application and report state are split into contexts with unrelated update
+ * times. `ReportsProvider` composes them so callers still mount a single
+ * provider while consumers subscribe only to the state they need.
  */
 
 const INITIAL_ROOT = './outputs' // fallback; will be overridden by /api/v1/config
 const REPORT_CACHE_LIMIT = 32 // bound the in-memory cache so long sessions don't grow unbounded
 
+// ------------------------------------------------------------------ //
+// Application configuration: backend metadata shared across the shell   //
+// ------------------------------------------------------------------ //
+
+interface AppConfigCtx {
+  config: ConfigResponse | null
+}
+
+const AppConfigContext = createContext<AppConfigCtx>({ config: null })
+
+function AppConfigProvider({ children }: { children: ReactNode }) {
+  const [config, setConfig] = useState<ConfigResponse | null>(null)
+
+  useEffect(() => {
+    let cancelled = false
+    apiValidated<ConfigResponse>('/api/v1/config')
+      .then((response) => {
+        if (!cancelled) setConfig(response)
+      })
+      .catch(() => {/* retain the empty config when the service is unavailable */})
+    return () => { cancelled = true }
+  }, [])
+
+  const value = useMemo(() => ({ config }), [config])
+  return <AppConfigContext.Provider value={value}>{children}</AppConfigContext.Provider>
+}
+
 // ------------------------------------------------------------------ //
 // Scan scope: which directory is being read, and when to re-read it   //
 // ------------------------------------------------------------------ //
@@ -96,6 +119,7 @@ function withCacheLimit(
 }
 
 function ScanProvider({ children }: { children: ReactNode }) {
+  const { config } = useAppConfig()
   const [rootPath, setRootPathState] = useState(INITIAL_ROOT)
   const [scanToken, setScanToken] = useState(0)
 
@@ -104,20 +128,12 @@ function ScanProvider({ children }: { children: ReactNode }) {
   const rootRef = useRef(rootPath)
   useEffect(() => { rootRef.current = rootPath }, [rootPath])
 
-  // Fetch the server-side default outputs_root from /api/v1/config on mount.
-  // Only apply it when the user has not already changed the root away from the
-  // initial default (checked at resolve time via the ref).
+  // Apply the server-side default unless the user has already changed the root.
   useEffect(() => {
-    let cancelled = false
-    apiValidated<ConfigResponse>('/api/v1/config')
-      .then((cfg) => {
-        if (!cancelled && cfg.outputs_root && rootRef.current === INITIAL_ROOT) {
-          setRootPathState(cfg.outputs_root)
-        }
-      })
-      .catch(() => {/* ignore; keep default */})
-    return () => { cancelled = true }
-  }, [])
+    if (config?.outputs_root && rootRef.current === INITIAL_ROOT) {
+      setRootPathState(config.outputs_root)
+    }
+  }, [config?.outputs_root])
 
   const setRootPath = useCallback((path: string) => setRootPathState(path), [])
 
@@ -205,16 +221,23 @@ function ReportCacheProvider({ children }: { children: ReactNode }) {
 
 export function ReportsProvider({ children }: { children: ReactNode }) {
   return (
-    <ScanProvider>
-      <CompareSelectionProvider>
-        <ReportCacheProvider>{children}</ReportCacheProvider>
-      </CompareSelectionProvider>
-    </ScanProvider>
+    <AppConfigProvider>
+      <ScanProvider>
+        <CompareSelectionProvider>
+          <ReportCacheProvider>{children}</ReportCacheProvider>
+        </CompareSelectionProvider>
+      </ScanProvider>
+    </AppConfigProvider>
   )
 }
 
 /* eslint-disable react-refresh/only-export-components */
 
+/** Backend configuration shared by the application shell and scan controls. */
+export function useAppConfig(): AppConfigCtx {
+  return useContext(AppConfigContext)
+}
+
 /** Which output directory is being read, and the token that fans out a rescan. */
 export function useScan(): ScanCtx {
   return useContext(ScanContext)
diff --git a/evalscope/web/src/layouts/MainLayout.test.tsx b/evalscope/web/src/layouts/MainLayout.test.tsx
new file mode 100644
index 000000000..4dc711aad
--- /dev/null
+++ b/evalscope/web/src/layouts/MainLayout.test.tsx
@@ -0,0 +1,40 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { act, cleanup, render, screen } from '@testing-library/react'
+import { MemoryRouter, Route, Routes } from 'react-router-dom'
+
+vi.mock('@/api/client', () => ({
+  apiValidated: vi.fn().mockResolvedValue({ outputs_root: '', version: '1.2.3' }),
+}))
+
+import { LocaleProvider } from '@/contexts/LocaleContext'
+import { ReportsProvider } from '@/contexts/ReportsContext'
+import MainLayout from './MainLayout'
+
+afterEach(() => {
+  cleanup()
+  vi.clearAllMocks()
+})
+
+describe('MainLayout', () => {
+  it('shows the backend EvalScope version', async () => {
+    vi.stubGlobal('scrollTo', vi.fn())
+
+    render(
+      <LocaleProvider>
+        <ReportsProvider>
+          <MemoryRouter initialEntries={['/dashboard']}>
+            <Routes>
+              <Route element={<MainLayout />}>
+                <Route path="/dashboard" element={null} />
+              </Route>
+            </Routes>
+          </MemoryRouter>
+        </ReportsProvider>
+      </LocaleProvider>,
+    )
+
+    await act(async () => { await Promise.resolve() })
+
+    expect(screen.getByTitle('EvalScope version 1.2.3')).toHaveTextContent('v1.2.3')
+  })
+})
diff --git a/tests/service/test_api_contracts.py b/tests/service/test_api_contracts.py
index 48ba31f21..323fe1be1 100644
--- a/tests/service/test_api_contracts.py
+++ b/tests/service/test_api_contracts.py
@@ -36,6 +36,7 @@
     WebApiContracts,
 )
 from evalscope.service.responses import json_response
+from evalscope.version import __version__
 
 ROOT = Path(__file__).parents[2]
 
@@ -116,7 +117,7 @@ def client(tmp_path):
 def test_config_and_idle_task_endpoints_use_response_contracts(client, tmp_path) -> None:
     config = client.get('/api/v1/config')
     assert config.status_code == 200
-    assert config.get_json() == {'outputs_root': str(tmp_path)}
+    assert config.get_json() == {'outputs_root': str(tmp_path), 'version': __version__}
 
     for scope in ('eval', 'perf'):
         progress = client.get(f'/api/v1/{scope}/progress', query_string={'task_id': 'missing-task'})