diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36b6aec2..08447caa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - **A leaked `serve.token` is rotated on Windows, not just Unix.** After SBS-953, a world-readable token was replaced on Unix, but Windows still tightened the DACL and reused the same secret. The ACL is now inspected before tightening; if anyone other than the current user, SYSTEM, or Administrators can read the file, the token is replaced. Closes SBS-1043.
 
 ### Fixed
+- **Frontend tests now catch accessibility regressions automatically.** A shared axe assertion checks representative quota cards, mini charts, and update banners in the existing Frontend CI job. Color contrast remains outside jsdom coverage because it requires a rendered browser. Fixes #222.
 - **`usage --all-accounts` now fetches every configured Codex and Claude account.** Account fetches run with bounded concurrency, preserve configured order, and report failures independently. Text and JSON identify each configured account while the default output remains unchanged. Fixes #274.
 - **The detached Settings window now reopens where you left it.** Its saved size and position are restored and clamped on screen instead of being overwritten by a second frontend resize on every open. Closes #275.
 - **`serve --refresh-interval` now controls response caching.** Successful usage and cost responses are cached separately by provider selection for the requested TTL. A zero interval disables caching, and provider failures are retried on the next request. Fixes #273.
diff --git a/apps/desktop-tauri/package.json b/apps/desktop-tauri/package.json
index 302c2f82..b31d5832 100644
--- a/apps/desktop-tauri/package.json
+++ b/apps/desktop-tauri/package.json
@@ -34,6 +34,7 @@
     "jsdom": "25.0.1",
     "typescript": "5.6.3",
     "vite": "6.4.3",
-    "vitest": "3.2.6"
+    "vitest": "3.2.6",
+    "vitest-axe": "^0.1.0"
   }
 }
diff --git a/apps/desktop-tauri/pnpm-lock.yaml b/apps/desktop-tauri/pnpm-lock.yaml
index 649b7886..e870f3f3 100644
--- a/apps/desktop-tauri/pnpm-lock.yaml
+++ b/apps/desktop-tauri/pnpm-lock.yaml
@@ -48,6 +48,9 @@ importers:
       vitest:
         specifier: 3.2.6
         version: 3.2.6(jsdom@25.0.1)
+      vitest-axe:
+        specifier: ^0.1.0
+        version: 0.1.0(vitest@3.2.6(jsdom@25.0.1))
 
 packages:
 
@@ -688,6 +691,10 @@ packages:
   asynckit@0.4.0:
     resolution: {integrity: sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==}
 
+  axe-core@4.13.0:
+    resolution: {integrity: sha512-UzGt8zg7Ny8djbYMhxl2zuEevVa7r2gJjYY5Lwr1xM7+XU2nd6CkIWFTVcCIbAP63vSz71NaVyyuSk9lHKcy0A==}
+    engines: {node: '>=4'}
+
   baseline-browser-mapping@2.10.43:
     resolution: {integrity: sha512-AjYpR78kDWAY3Efj+cDTFH9t9SCoL7OoTp1BOb0mQV7S+6CiLwnWM3FyxhJtdPufDFKzmCSFoUncKjWgJEZTCQ==}
     engines: {node: '>=6.0.0'}
@@ -717,6 +724,10 @@ packages:
     resolution: {integrity: sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==}
     engines: {node: '>=8'}
 
+  chalk@5.6.2:
+    resolution: {integrity: sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA==}
+    engines: {node: ^12.17.0 || ^14.13 || >=16.0.0}
+
   check-error@2.1.3:
     resolution: {integrity: sha512-PAJdDJusoxnwm1VwW07VWwUN1sl7smmC3OKggvndJFadxxDRyFJBX/ggnu/KE4kQAB7a3Dp8f/YXC1FlUprWmA==}
     engines: {node: '>= 16'}
@@ -926,6 +937,9 @@ packages:
     engines: {node: '>=6'}
     hasBin: true
 
+  lodash-es@4.18.1:
+    resolution: {integrity: sha512-J8xewKD/Gk22OZbhpOVSwcs60zhd95ESDwezOFuA3/099925PdHJ7OFHNTGtajL3AlZkykD32HykiMo+BIBI8A==}
+
   lodash@4.18.1:
     resolution: {integrity: sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==}
 
@@ -1174,6 +1188,11 @@ packages:
       yaml:
         optional: true
 
+  vitest-axe@0.1.0:
+    resolution: {integrity: sha512-jvtXxeQPg8R/2ANTY8QicA5pvvdRP4F0FsVUAHANJ46YCDASie/cuhlSzu0DGcLmZvGBSBNsNuK3HqfaeknyvA==}
+    peerDependencies:
+      vitest: '>=0.16.0'
+
   vitest@3.2.6:
     resolution: {integrity: sha512-xejya+bT/j/+R/AGa1XOfRxLmNUlLtlwjRsFUILF+xHfzElmGcmFydy2gqqIrd62ptIEfwVMofd19uNWD9L7Nw==}
     engines: {node: ^18.0.0 || ^20.0.0 || >=22.0.0}
@@ -1771,6 +1790,8 @@ snapshots:
 
   asynckit@0.4.0: {}
 
+  axe-core@4.13.0: {}
+
   baseline-browser-mapping@2.10.43: {}
 
   browserslist@4.28.6:
@@ -1803,6 +1824,8 @@ snapshots:
       ansi-styles: 4.3.0
       supports-color: 7.2.0
 
+  chalk@5.6.2: {}
+
   check-error@2.1.3: {}
 
   color-convert@2.0.1:
@@ -2024,6 +2047,8 @@ snapshots:
 
   json5@2.2.3: {}
 
+  lodash-es@4.18.1: {}
+
   lodash@4.18.1: {}
 
   loose-envify@1.4.0:
@@ -2245,6 +2270,16 @@ snapshots:
     optionalDependencies:
       fsevents: 2.3.3
 
+  vitest-axe@0.1.0(vitest@3.2.6(jsdom@25.0.1)):
+    dependencies:
+      aria-query: 5.3.2
+      axe-core: 4.13.0
+      chalk: 5.6.2
+      dom-accessibility-api: 0.5.16
+      lodash-es: 4.18.1
+      redent: 3.0.0
+      vitest: 3.2.6(jsdom@25.0.1)
+
   vitest@3.2.6(jsdom@25.0.1):
     dependencies:
       '@types/chai': 5.2.3
diff --git a/apps/desktop-tauri/src/components/MiniBarChart.test.tsx b/apps/desktop-tauri/src/components/MiniBarChart.test.tsx
index 177e3d9e..3590a831 100644
--- a/apps/desktop-tauri/src/components/MiniBarChart.test.tsx
+++ b/apps/desktop-tauri/src/components/MiniBarChart.test.tsx
@@ -1,6 +1,7 @@
 import { render, screen } from "@testing-library/react";
 import { describe, expect, it, vi } from "vitest";
 import { SimpleBarChart, StackedBarChart } from "./MiniBarChart";
+import { expectNoAccessibilityViolations } from "../test/accessibility";
 
 vi.mock("../hooks/useLocale", () => ({
   useLocale: () => ({ t: () => "No data" }),
@@ -18,4 +19,18 @@ describe("MiniBarChart empty state", () => {
 
     expect(screen.getByRole("img", { name: "No data" })).toBeTruthy();
   });
+
+  it("has no detectable accessibility violations", async () => {
+    const { container } = render(
+      <SimpleBarChart
+        label="Daily cost"
+        points={[
+          { date: "2026-08-18", value: 3 },
+          { date: "2026-08-19", value: 5 },
+        ]}
+      />,
+    );
+
+    await expectNoAccessibilityViolations(container);
+  });
 });
diff --git a/apps/desktop-tauri/src/components/PlanStatusCard.test.tsx b/apps/desktop-tauri/src/components/PlanStatusCard.test.tsx
index 944b4c4b..b136e7d5 100644
--- a/apps/desktop-tauri/src/components/PlanStatusCard.test.tsx
+++ b/apps/desktop-tauri/src/components/PlanStatusCard.test.tsx
@@ -2,6 +2,7 @@ import { render, screen } from "@testing-library/react";
 import { describe, expect, it, vi } from "vitest";
 import PlanStatusCard from "./PlanStatusCard";
 import type { ProviderUsageSnapshot, RateWindowSnapshot } from "../types/bridge";
+import { expectNoAccessibilityViolations } from "../test/accessibility";
 
 vi.mock("../hooks/useLocale", () => ({
   useLocale: () => ({
@@ -67,6 +68,19 @@ function provider(
 }
 
 describe("PlanStatusCard", () => {
+  it("has no detectable accessibility violations", async () => {
+    const { container } = render(
+      <PlanStatusCard
+        provider={provider()}
+        resetTimeRelative
+        showAsUsed
+        onSelect={vi.fn()}
+      />,
+    );
+
+    await expectNoAccessibilityViolations(container);
+  });
+
   it("includes displayed quota windows in the card button name", () => {
     render(
       <PlanStatusCard
diff --git a/apps/desktop-tauri/src/components/UpdateBanner.test.tsx b/apps/desktop-tauri/src/components/UpdateBanner.test.tsx
index d07ed1f9..5198f4c7 100644
--- a/apps/desktop-tauri/src/components/UpdateBanner.test.tsx
+++ b/apps/desktop-tauri/src/components/UpdateBanner.test.tsx
@@ -2,6 +2,7 @@ import { render, screen } from "@testing-library/react";
 import { describe, expect, it, vi } from "vitest";
 import type { UpdateStatePayload } from "../types/bridge";
 import UpdateBanner from "./UpdateBanner";
+import { expectNoAccessibilityViolations } from "../test/accessibility";
 
 vi.mock("../hooks/useLocale", () => ({
   useLocale: () => ({ t: (key: string) => key }),
@@ -81,4 +82,12 @@ describe("UpdateBanner accessibility", () => {
     );
     expect(screen.getByRole("alert").textContent).toContain("network failed");
   });
+
+  it("has no detectable accessibility violations", async () => {
+    const { container } = render(
+      <UpdateBanner updateState={state("available")} {...handlers} />,
+    );
+
+    await expectNoAccessibilityViolations(container);
+  });
 });
diff --git a/apps/desktop-tauri/src/test/accessibility.ts b/apps/desktop-tauri/src/test/accessibility.ts
new file mode 100644
index 00000000..7e609ec6
--- /dev/null
+++ b/apps/desktop-tauri/src/test/accessibility.ts
@@ -0,0 +1,17 @@
+import { axe } from "vitest-axe";
+import type { AxeMatchers } from "vitest-axe";
+import { expect } from "vitest";
+
+export async function expectNoAccessibilityViolations(
+  container: Element,
+): Promise<void> {
+  const results = await axe(container, {
+    rules: {
+      // jsdom does not implement the canvas API axe uses for contrast.
+      "color-contrast": { enabled: false },
+    },
+  });
+  (
+    expect(results) as unknown as ReturnType<typeof expect> & AxeMatchers
+  ).toHaveNoViolations();
+}
diff --git a/apps/desktop-tauri/src/test/setup.ts b/apps/desktop-tauri/src/test/setup.ts
index f149f27a..50b4fcf4 100644
--- a/apps/desktop-tauri/src/test/setup.ts
+++ b/apps/desktop-tauri/src/test/setup.ts
@@ -1 +1,6 @@
 import "@testing-library/jest-dom/vitest";
+import "vitest-axe/extend-expect";
+import * as axeMatchers from "vitest-axe/matchers";
+import { expect } from "vitest";
+
+expect.extend(axeMatchers);