PRIVACY POLICY – MAILBRIEF
Last updated: March 2026
1. OVERVIEW
MailBrief ("the Extension") is a Chrome extension that summarises Gmail email threads using on-device artificial intelligence. This policy explains what data the Extension accesses, how it is used, and your rights.
2. DATA WE DO NOT COLLECT
MailBrief does not collect, transmit, store, or share:
- The content of any email you summarise
- Your Gmail address or account information
- Any browsing history or usage analytics
- Any personal information of any kind
Email text is processed entirely on your device by Chrome's built-in Gemini Nano AI model. It is never sent to our servers or any third-party server.
3. DATA WE DO STORE LOCALLY
The Extension stores the following data in your browser's local storage (chrome.storage.local). This data never leaves your device:
- Your UI preferences (e.g. button position, reply toggle setting)
- A cached copy of your subscription status (paid/free)
4. PAYMENT PROCESSING
Premium subscriptions are handled by ExtPay (https://extensionpay.com), which uses Stripe for payment processing. When you subscribe or when the Extension checks your subscription status, your unique Extension ID is sent to extensionpay.com. No email content or personal browsing data is transmitted.
Stripe's privacy policy applies to any payment information you provide: https://stripe.com/privacy
ExtPay's privacy policy: https://extensionpay.com/privacy
5. PERMISSIONS USED
activeTab: To read the Gmail thread you have open, for the purpose of summarisation. Used only when you explicitly trigger the summarise action.
scripting: To display the MailBrief button and summary overlay within Gmail.
storage: To save your preferences and subscription status locally on your device.
Access to mail.google.com: The Extension only operates on Gmail. It does not access any other websites.
Access to extensionpay.com: To verify your subscription status with ExtPay/Stripe.
6. CHILDREN'S PRIVACY
MailBrief is not directed at children under the age of 13 and we do not knowingly collect any information from children.
7. CHANGES TO THIS POLICY
If this policy changes materially, we will update the "Last updated" date above. Continued use of the Extension after changes constitutes acceptance of the revised policy.
8. CONTACT
For privacy questions, please use the support link on the Chrome Web Store listing