Privacy Policy
Effective 2026-10-02
This privacy policy applies to the Mailtrove app (the “Application”) for mobile devices, created by HO CHIU FUNG (the “Service Provider”). The Application is provided “AS IS”.
What the Application stores, and where
Everything you add is stored locally on your device only:
- Photos of your letters
- The text read from them and their details (date, sender, receiver, category, summary)
- Your corrections, deleted letters (kept in Recently Deleted for 30 days) and settings such as language and app lock
The Application’s data is protected by iOS file encryption, and you can additionally lock the Application with Face ID, Touch ID or your passcode. If iCloud Backup is turned on for your iPhone, this data is included in your iPhone’s backup under Apple’s terms. The Application does not require an account.
What leaves your device, and why
Reading a letter. To transcribe a letter, each page photo is reduced in size and sent over an encrypted HTTPS connection to the Service Provider’s server (hosted on Google Cloud), which forwards it to Google’s Gemini model on Vertex AI and returns the result to your device.
Asking a question. Your question, and the details or text of the letters the assistant looks up to answer it, are sent the same way. Earlier questions and answers in the same conversation are included so follow-up questions make sense.
The Service Provider’s server does not store your photos, letter text or questions, and does not log their contents. Under Google Cloud’s terms, Google does not use this data to train its models. Vertex AI data caching has been turned off for the Service Provider’s project. Google may retain request data for a limited time for abuse monitoring as described in Google Cloud’s service terms; requests are processed through Google’s global endpoint.
Does the Application collect location information?
No. The Application does not request or collect location information.
Do third parties see your information?
Only Google, as the AI processor described above, and only the photos or text needed to read a letter or answer your question.
Your choices and rights
- Export: Settings → Export all letters creates a ZIP file with every photo and all text, which you can keep anywhere.
- Delete: deleting a letter moves it to Recently Deleted; it is removed for good after 30 days, or immediately if you choose “Delete now”.
- Remove everything: uninstalling the Application deletes all data stored in it (other than any iPhone backups you have made).
Because your letters are not stored on the Service Provider’s servers, there is no server-side data to access or delete. Questions about your data can be sent to support@mailtrove.app.
Children
The Application is not directed to children under the age of 13 and does not knowingly collect personally identifiable information from children. If you believe a child has provided personal information through the Application, please contact support@mailtrove.app. Users in the EEA and UK must be at least 16 years of age (or the equivalent local digital-consent age) to use the Application without parental consent.
Security
Data sent from the Application is encrypted in transit (HTTPS). Requests to the Service Provider’s server require an application key and are rate-limited. Data on your device is protected by iOS file encryption and, optionally, the in-app lock.
Changes
This Privacy Policy may be updated from time to time, for example if accounts, cloud backup or paid plans are introduced. Changes will be posted on this page with a new effective date. Continued use of the Application after any change constitutes acceptance of the change.
Contact
Questions about this policy: support@mailtrove.app.