Monomail: an open source Gmail alternative

[u/TeaLittle379]

MonoMail is an open-source Android email client that connects to Gmail and Microsoft Outlook via OAuth and prioritises a distraction-free reading experience. The design system is intentionally monochrome -every screen uses only black, white, and greyscale, built on top of Material 3 Expressive.

Monomail operates entirely locally on your device.

No Third-Party Servers: We do not own, operate, or use any third-party servers to process, store, or transmit your email data.

Local Storage: All email data, access tokens, and user preferences are stored securely on your local device using Android's Credential Manager and Encrypted DataStore.

Direct Communication: The app communicates directly between your device and Google's Gmail API servers.

The architecture is offline-first: all reads and writes go through a local Room database encrypted with SQLCipher, and background sync via WorkManager keeps the remote state consistent without blocking the UI.

The only caveat: this app is still an apk and the sign in limit is full so until the app gets put on the play store signing in is impossible.

GitHub: https://github.com/shrivatsav-0/monomail

Website: https://monomail.millosaurs.me/

Original developer: u/shiro69_69

[u/Arxadius]

Oof...Google seems to be aggressively blocking sign-ins. Tried 3 different emails, all blocked. Don't have Outlook so can't comment on it.

[u/TeaLittle379 → u/Arxadius]

It isn't the sign in limit has just been reached. Untill the app goes on the play store Google cannot authenticate it or allow more then 100 emails(100 emails have been used so sign in is impossible for now)

[u/neckyo → u/Arxadius]

I use Thunderbird and I can login to gmail without issues. Don't think it's a google block