diff --git a/apps/readest-app/src/__tests__/services/readwise/ReadwiseClient.test.ts b/apps/readest-app/src/__tests__/services/readwise/ReadwiseClient.test.ts
index 639c7fd0..801d5f88 100644
--- a/apps/readest-app/src/__tests__/services/readwise/ReadwiseClient.test.ts
+++ b/apps/readest-app/src/__tests__/services/readwise/ReadwiseClient.test.ts
@@ -1,9 +1,19 @@
 import { describe, test, expect, vi, beforeEach, afterEach } from 'vitest';
+import { fetch as tauriFetch } from '@tauri-apps/plugin-http';
 import { ReadwiseClient } from '@/services/readwise/ReadwiseClient';
 import { READWISE_API_BASE_URL } from '@/services/constants';
+import { isTauriAppPlatform } from '@/services/environment';
 import type { ReadwiseSettings } from '@/types/settings';
 import type { Book, BookNote } from '@/types/book';
 
+vi.mock('@tauri-apps/plugin-http', () => ({
+  fetch: vi.fn(),
+}));
+
+vi.mock('@/services/environment', () => ({
+  isTauriAppPlatform: vi.fn(() => false),
+}));
+
 const makeSettings = (overrides: Partial<ReadwiseSettings> = {}): ReadwiseSettings => ({
   enabled: true,
   accessToken: 'test-token',
@@ -37,6 +47,10 @@ describe('ReadwiseClient base URL', () => {
   beforeEach(() => {
     fetchMock = vi.fn().mockResolvedValue(new Response(null, { status: 204 }));
     vi.stubGlobal('fetch', fetchMock);
+    vi.mocked(tauriFetch)
+      .mockReset()
+      .mockResolvedValue(new Response(null, { status: 204 }));
+    vi.mocked(isTauriAppPlatform).mockReturnValue(false);
   });
 
   afterEach(() => {
@@ -79,4 +93,20 @@ describe('ReadwiseClient base URL', () => {
     expect(init.method).toBe('POST');
     expect((init.headers as Record<string, string>)['Authorization']).toBe('Token test-token');
   });
+
+  test('validateToken uses the Tauri HTTP transport in the desktop app', async () => {
+    vi.mocked(isTauriAppPlatform).mockReturnValue(true);
+    const client = new ReadwiseClient(makeSettings({ baseUrl: 'https://example.com/api/v2' }));
+
+    await client.validateToken();
+
+    expect(tauriFetch).toHaveBeenCalledWith('https://example.com/api/v2/auth/', {
+      method: 'GET',
+      headers: {
+        Authorization: 'Token test-token',
+      },
+      body: undefined,
+    });
+    expect(fetchMock).not.toHaveBeenCalled();
+  });
 });
diff --git a/apps/readest-app/src/services/readwise/ReadwiseClient.ts b/apps/readest-app/src/services/readwise/ReadwiseClient.ts
index c6e4202e..4a8e8a8f 100644
--- a/apps/readest-app/src/services/readwise/ReadwiseClient.ts
+++ b/apps/readest-app/src/services/readwise/ReadwiseClient.ts
@@ -1,7 +1,9 @@
 import { Book, BookNote, HighlightColor } from '@/types/book';
 import { ReadwiseSettings } from '@/types/settings';
 import { READWISE_API_BASE_URL } from '@/services/constants';
+import { isTauriAppPlatform } from '@/services/environment';
 import { buildAnnotationWebUrl } from '@/utils/deeplink';
+import { fetch as tauriFetch } from '@tauri-apps/plugin-http';
 
 const READEST_TO_READWISE_COLOR: Record<HighlightColor, string> = {
   red: 'pink',
@@ -34,7 +36,8 @@ export class ReadwiseClient {
     options: { method?: 'GET' | 'POST'; body?: string } = {},
   ): Promise<Response> {
     const { method = 'GET', body } = options;
-    return fetch(`${this.baseUrl}${endpoint}`, {
+    const fetchFn = isTauriAppPlatform() ? tauriFetch : globalThis.fetch;
+    return fetchFn(`${this.baseUrl}${endpoint}`, {
       method,
       headers: {
         Authorization: `Token ${this.config.accessToken}`,