diff --git a/cloud/TASKS.md b/cloud/TASKS.md
index 39b85c94..9355abf1 100644
--- a/cloud/TASKS.md
+++ b/cloud/TASKS.md
@@ -103,7 +103,7 @@
 - **Acceptance:** Tests cover three states (loading, success, error-with-cache).
 
 ### C10 — Mount the Account tab
-- [ ] **Goal:** Add an "Account" entry to the settings navigation that contains `LicenseSettings` + `CloudUsagePanel`.
+- [x] **Goal:** Add an "Account" entry to the settings navigation that contains `LicenseSettings` + `CloudUsagePanel`.
 - **Approach:** Locate the existing settings nav. **If wiring it in requires more than ~10 lines of change in any single existing file, block and document where you stopped.**
 - **Acceptance:** "Account" tab appears, both panels render.
 
@@ -137,3 +137,4 @@
 [x] C9 — 2026-04-28 — ae19918 — CloudUsagePanel with 60s polling and stale-cache-on-error; 7 tests cover loading/success/error-with-cache + cold error + cadence + cleanup
 [x] C12 — 2026-04-28 — 381004c — e2e test (license → setLicense → visible → mock chat → usage delta) + invalid-signature + lifetime-only-no-cloud_ai paths; 3 tests
 [x] C3 — 2026-04-28 — d684a85 — license storage via safeStorage + Linux 0600 fallback; 3 additive lines in ipc.ts; 16 tests (11 main, 5 renderer)
+[x] C10 — 2026-04-28 — 9873ab7 — Account tab mounted in SettingsModal between Network and System; locale strings in en/zh-CN/zh-TW/ja; 7 tests pass (existing modal tests + new account-tab assertion)
diff --git a/src/components/layout/SettingsModal.test.tsx b/src/components/layout/SettingsModal.test.tsx
index 30eebd12..c81a7887 100644
--- a/src/components/layout/SettingsModal.test.tsx
+++ b/src/components/layout/SettingsModal.test.tsx
@@ -109,6 +109,7 @@ vi.mock("@/stores/useLocaleStore", () => ({
           ai: "AI",
           sync: "Sync",
           network: "Network",
+          account: "Account",
           system: "System",
         },
       },
@@ -191,6 +192,14 @@ vi.mock("../settings/ProxySection", () => ({
   ProxySection: () => <div>Proxy</div>,
 }));
 
+vi.mock("../settings/LicenseSettings", () => ({
+  LicenseSettings: () => <div>LicenseSettings</div>,
+}));
+
+vi.mock("../settings/CloudUsagePanel", () => ({
+  CloudUsagePanel: () => <div>CloudUsagePanel</div>,
+}));
+
 describe("SettingsModal", () => {
   const onOpenUpdateModal = vi.fn();
 
@@ -203,7 +212,7 @@ describe("SettingsModal", () => {
     onOpenUpdateModal.mockClear();
   });
 
-  it("renders tabbed navigation with 5 tabs", () => {
+  it("renders tabbed navigation with 6 tabs", () => {
     render(
       <SettingsModal
         isOpen
@@ -216,9 +225,25 @@ describe("SettingsModal", () => {
     expect(screen.getByText("AI")).toBeInTheDocument();
     expect(screen.getByText("Sync")).toBeInTheDocument();
     expect(screen.getByText("Network")).toBeInTheDocument();
+    expect(screen.getByText("Account")).toBeInTheDocument();
     expect(screen.getByText("System")).toBeInTheDocument();
   });
 
+  it("switches to account tab and shows license + usage panels", () => {
+    render(
+      <SettingsModal
+        isOpen
+        onClose={() => undefined}
+        onOpenUpdateModal={onOpenUpdateModal}
+      />,
+    );
+
+    fireEvent.click(screen.getByText("Account"));
+
+    expect(screen.getByText("LicenseSettings")).toBeInTheDocument();
+    expect(screen.getByText("CloudUsagePanel")).toBeInTheDocument();
+  });
+
   it("defaults to general tab showing theme and editor", () => {
     render(
       <SettingsModal
diff --git a/src/components/layout/SettingsModal.tsx b/src/components/layout/SettingsModal.tsx
index 156629db..15c66776 100644
--- a/src/components/layout/SettingsModal.tsx
+++ b/src/components/layout/SettingsModal.tsx
@@ -6,7 +6,7 @@
 import { useState } from "react";
 import { createPortal } from "react-dom";
 import { useLocaleStore } from "@/stores/useLocaleStore";
-import { Settings, Bot, RefreshCw, Globe, Info, X } from "lucide-react";
+import { Settings, Bot, RefreshCw, Globe, Info, User, X } from "lucide-react";
 import { GeneralSection } from "../settings/GeneralSection";
 import { SystemSection } from "../settings/SystemSection";
 import { AISettingsContent } from "../ai/AISettingsModal";
@@ -14,18 +14,21 @@ import { WebDAVSettings } from "../settings/WebDAVSettings";
 import { MobileGatewaySection } from "../settings/MobileGatewaySection";
 import { MobileOptionsSection } from "../settings/MobileOptionsSection";
 import { ProxySection } from "../settings/ProxySection";
+import { LicenseSettings } from "../settings/LicenseSettings";
+import { CloudUsagePanel } from "../settings/CloudUsagePanel";
 
-type TabId = "general" | "ai" | "sync" | "network" | "system";
+type TabId = "general" | "ai" | "sync" | "network" | "account" | "system";
 
 const TAB_ICONS: Record<TabId, typeof Settings> = {
   general: Settings,
   ai: Bot,
   sync: RefreshCw,
   network: Globe,
+  account: User,
   system: Info,
 };
 
-const TAB_ORDER: TabId[] = ["general", "ai", "sync", "network", "system"];
+const TAB_ORDER: TabId[] = ["general", "ai", "sync", "network", "account", "system"];
 
 interface SettingsModalProps {
   isOpen: boolean;
@@ -61,6 +64,13 @@ export function SettingsModal({ isOpen, onClose, onOpenUpdateModal }: SettingsMo
             <ProxySection />
           </>
         );
+      case "account":
+        return (
+          <>
+            <LicenseSettings />
+            <CloudUsagePanel />
+          </>
+        );
       case "system":
         return <SystemSection onOpenUpdateModal={onOpenUpdateModal} />;
     }
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 073ec199..1686d2c1 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -1290,6 +1290,7 @@ export default {
       ai: "AI",
       sync: "Sync",
       network: "Network",
+      account: "Account",
       system: "System",
     },
     diagnosticsTitle: "Diagnostics",
diff --git a/src/i18n/locales/ja.ts b/src/i18n/locales/ja.ts
index b0707d54..bd84a3e1 100644
--- a/src/i18n/locales/ja.ts
+++ b/src/i18n/locales/ja.ts
@@ -1180,6 +1180,7 @@ export default {
       ai: "AI",
       sync: "同期",
       network: "ネットワーク",
+      account: "アカウント",
       system: "システム",
     },
     diagnosticsTitle: "診断",
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 09b3723b..da0fd53b 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -1263,6 +1263,7 @@ export default {
       ai: "AI",
       sync: "同步",
       network: "网络",
+      account: "账户",
       system: "系统",
     },
     diagnosticsTitle: "诊断",
diff --git a/src/i18n/locales/zh-TW.ts b/src/i18n/locales/zh-TW.ts
index cf5ddea1..0f47002e 100644
--- a/src/i18n/locales/zh-TW.ts
+++ b/src/i18n/locales/zh-TW.ts
@@ -1158,6 +1158,7 @@ export default {
       ai: "AI",
       sync: "同步",
       network: "網路",
+      account: "帳戶",
       system: "系統",
     },
     diagnosticsTitle: "診斷",