Sentence Studio Privacy Policy
1. Who we are
Sentence Studio is an independent project by an independent developer. It is not affiliated with or endorsed by OpenAI or Anthropic. Contact details are in section 10.
2. What data the extension handles
| Data | When and why | Where it goes |
|---|---|---|
| Text you select or paste | Only when you click Rephrase with AI, use the right-click menu, press the desktop shortcut or use the popup text box. Used to create three rewritten versions. | Sent to your chosen AI provider for that one request. Not stored by the extension. |
| ChatGPT account information (name, email, account ID) | When you sign in with ChatGPT, to show which account is connected and to verify the sign-in. | Chrome session storage on your device (cleared when Chrome closes). Your email, account ID and the app registration ID from your last login are kept in Chrome local storage to reconnect the same app registration. |
| ChatGPT sign-in tokens | To make rewrite requests with your ChatGPT plan. | Kept only in memory inside the extension. Never written to disk, never shown to web pages, never sent to the desktop helper or to the developer. Sent only to OpenAI. |
| Settings | Your chosen AI provider, model choices and whether the desktop helper is enabled. | Chrome local storage on your device. |
| Web page content | The extension reads your current selection to show the Rephrase with AI button and to replace text when you click Replace. | Stays on your device. Pages are not scanned or collected, and only the text you choose to rewrite is sent anywhere. |
The extension does not collect browsing history, location, financial or health information, keystrokes, or the content of pages you do not select text on.
3. AI providers
ChatGPT (OpenAI). When you use ChatGPT, the selected text and the rewrite instructions are sent directly from your browser to OpenAI (api.openai.com) using your own ChatGPT account. Sign-in happens through auth.openai.com. Requests are made with OpenAI's store: false option. OpenAI's handling of this data is governed by OpenAI's Privacy Policy.
Claude (Anthropic). When you choose Claude, the selected text is passed to the Sentence Studio desktop app on your own computer, which runs the official Claude Code app that you installed and signed into yourself. Claude Code sends the text to Anthropic under your own Claude account. Sentence Studio never sees your Claude credentials. Anthropic's handling of this data is governed by Anthropic's Privacy Policy and your Claude plan's terms.
4. Optional desktop helper apps
The optional Sentence Studio apps for Windows and macOS let you rephrase text in other programs, such as Microsoft Teams. They talk to the extension only through Chrome's private native-messaging connection on your computer, and no network listener is opened. They read the selected text only when you press the shortcut or use their text box. They may briefly use the clipboard to copy or paste your selection, and they try to restore your previous clipboard contents afterwards. Selected text and results are kept in memory and cleared when the window closes. Nothing is logged or saved to disk.
5. What we do not do
- No developer-operated servers: your text, account details and tokens are never sent to the developer.
- No analytics, telemetry, advertising or third-party tracking code.
- No rewrite history.
- No selling, renting or sharing of user data, and no use of it for creditworthiness, lending or advertising.
- No use or transfer of user data for purposes unrelated to rewriting your text.
6. Donations
The Donate with PayPal button opens PayPal's own website in a new tab. No account data or text is passed to PayPal. Any donation is handled under PayPal's privacy policy.
7. Retention and deletion
Selected text is held only while a rewrite runs. ChatGPT tokens disappear when you sign out, restart Chrome or reload the extension. To delete everything the extension stores, remove it from Chrome. Signing out also asks OpenAI to revoke the session. You can disconnect the app's ChatGPT access in ChatGPT under Settings → Security. Data already sent to OpenAI or Anthropic is handled under their policies.
8. Security
Credentials are kept in memory in an isolated extension worker and never exposed to web pages. Network requests are limited to the OpenAI addresses the extension needs. The desktop helpers accept connections only from this extension.
9. Children
Sentence Studio is not directed to children under 13 and does not knowingly collect their data. Use of ChatGPT and Claude is subject to the age requirements of OpenAI and Anthropic.
10. Changes and contact
If this policy changes, the updated version will be posted on this page with a new effective date. Questions or requests: sentence.studio.ai@gmail.com.
Sentence Studio's use of user data complies with the Chrome Web Store User Data Policy, including the Limited Use requirements.