diff --git a/packages/tanstackstart-react/src/client/index.ts b/packages/tanstackstart-react/src/client/index.ts
index c45aad673ad0..7c603d040693 100644
--- a/packages/tanstackstart-react/src/client/index.ts
+++ b/packages/tanstackstart-react/src/client/index.ts
@@ -1 +1,3 @@
 export * from '@sentry/react';
+
+export { init } from './sdk';
diff --git a/packages/tanstackstart-react/src/client/sdk.ts b/packages/tanstackstart-react/src/client/sdk.ts
new file mode 100644
index 000000000000..b0ee3b53053f
--- /dev/null
+++ b/packages/tanstackstart-react/src/client/sdk.ts
@@ -0,0 +1,20 @@
+import type { Client } from '@sentry/core';
+import { applySdkMetadata } from '@sentry/core';
+import type { BrowserOptions as ReactBrowserOptions } from '@sentry/react';
+import { getDefaultIntegrations as getReactDefaultIntegrations, init as initReactSDK } from '@sentry/react';
+
+/**
+ * Initializes the TanStack Start React SDK
+ *
+ * @param options Configuration options for the SDK.
+ */
+export function init(options: ReactBrowserOptions): Client | undefined {
+  const sentryOptions: ReactBrowserOptions = {
+    defaultIntegrations: [...getReactDefaultIntegrations(options)],
+    ...options,
+  };
+
+  applySdkMetadata(sentryOptions, 'tanstackstart-react', ['tanstackstart-react', 'react']);
+
+  return initReactSDK(sentryOptions);
+}
diff --git a/packages/tanstackstart-react/src/server/index.ts b/packages/tanstackstart-react/src/server/index.ts
index c79572a7f318..f377305d429f 100644
--- a/packages/tanstackstart-react/src/server/index.ts
+++ b/packages/tanstackstart-react/src/server/index.ts
@@ -1,5 +1,7 @@
 export * from '@sentry/node';
 
+export { init } from './sdk';
+
 /**
  * A passthrough error boundary for the server that doesn't depend on any react. Error boundaries don't catch SSR errors
  * so they should simply be a passthrough.
diff --git a/packages/tanstackstart-react/src/server/sdk.ts b/packages/tanstackstart-react/src/server/sdk.ts
new file mode 100644
index 000000000000..1bf2b5e65be2
--- /dev/null
+++ b/packages/tanstackstart-react/src/server/sdk.ts
@@ -0,0 +1,17 @@
+import { applySdkMetadata } from '@sentry/core';
+import type { NodeClient, NodeOptions } from '@sentry/node';
+import { getDefaultIntegrations as getDefaultNodeIntegrations, init as initNodeSdk } from '@sentry/node';
+
+/**
+ * Initializes the server side of the TanStack Start React SDK
+ */
+export function init(options: NodeOptions): NodeClient | undefined {
+  const sentryOptions: NodeOptions = {
+    defaultIntegrations: [...getDefaultNodeIntegrations(options)],
+    ...options,
+  };
+
+  applySdkMetadata(sentryOptions, 'tanstackstart-react', ['tanstackstart-react', 'node']);
+
+  return initNodeSdk(sentryOptions);
+}
diff --git a/packages/tanstackstart-react/test/client/sdk.test.ts b/packages/tanstackstart-react/test/client/sdk.test.ts
new file mode 100644
index 000000000000..4cba4a199ef5
--- /dev/null
+++ b/packages/tanstackstart-react/test/client/sdk.test.ts
@@ -0,0 +1,45 @@
+import * as SentryReact from '@sentry/react';
+import { SDK_VERSION } from '@sentry/react';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { init } from '../../src/client';
+
+const reactInit = vi.spyOn(SentryReact, 'init');
+
+describe('TanStack Start React Client SDK', () => {
+  describe('init', () => {
+    beforeEach(() => {
+      vi.clearAllMocks();
+    });
+
+    it('Adds TanStack Start React client metadata to the SDK options', () => {
+      expect(reactInit).not.toHaveBeenCalled();
+
+      init({
+        dsn: 'https://public@dsn.ingest.sentry.io/1337',
+      });
+
+      const expectedMetadata = {
+        _metadata: {
+          sdk: {
+            name: 'sentry.javascript.tanstackstart-react',
+            version: SDK_VERSION,
+            packages: [
+              { name: 'npm:@sentry/tanstackstart-react', version: SDK_VERSION },
+              { name: 'npm:@sentry/react', version: SDK_VERSION },
+            ],
+            settings: {
+              infer_ip: 'never',
+            },
+          },
+        },
+      };
+
+      expect(reactInit).toHaveBeenCalledTimes(1);
+      expect(reactInit).toHaveBeenLastCalledWith(expect.objectContaining(expectedMetadata));
+    });
+
+    it('returns client from init', () => {
+      expect(init({})).not.toBeUndefined();
+    });
+  });
+});
diff --git a/packages/tanstackstart-react/test/server/sdk.test.ts b/packages/tanstackstart-react/test/server/sdk.test.ts
new file mode 100644
index 000000000000..f95d970ce8cc
--- /dev/null
+++ b/packages/tanstackstart-react/test/server/sdk.test.ts
@@ -0,0 +1,42 @@
+import * as SentryNode from '@sentry/node';
+import { SDK_VERSION } from '@sentry/node';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { init } from '../../src/server';
+
+const nodeInit = vi.spyOn(SentryNode, 'init');
+
+describe('TanStack Start React Server SDK', () => {
+  describe('init', () => {
+    beforeEach(() => {
+      vi.clearAllMocks();
+    });
+
+    it('Adds TanStack Start React server metadata to the SDK options', () => {
+      expect(nodeInit).not.toHaveBeenCalled();
+
+      init({
+        dsn: 'https://public@dsn.ingest.sentry.io/1337',
+      });
+
+      const expectedMetadata = {
+        _metadata: {
+          sdk: {
+            name: 'sentry.javascript.tanstackstart-react',
+            version: SDK_VERSION,
+            packages: [
+              { name: 'npm:@sentry/tanstackstart-react', version: SDK_VERSION },
+              { name: 'npm:@sentry/node', version: SDK_VERSION },
+            ],
+          },
+        },
+      };
+
+      expect(nodeInit).toHaveBeenCalledTimes(1);
+      expect(nodeInit).toHaveBeenLastCalledWith(expect.objectContaining(expectedMetadata));
+    });
+
+    it('returns client from init', () => {
+      expect(init({})).not.toBeUndefined();
+    });
+  });
+});
diff --git a/packages/tanstackstart-react/test/temp.test.ts b/packages/tanstackstart-react/test/temp.test.ts
deleted file mode 100644
index dc8614cad037..000000000000
--- a/packages/tanstackstart-react/test/temp.test.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { describe, expect, it } from 'vitest';
-
-describe('Basic test suite', () => {
-  it('should pass', () => {
-    expect(true).toBe(true);
-  });
-});