Monomail

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 with Google Sans and Roboto.

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

Features

Inbox

- Pull-to-reveal loader that physically shifts inbox content to expose a refresh indicator - Swipe right to archive or unarchive a thread - Swipe left to star or unstar a thread - Long-press contextual menu to star, archive, mark unread, or delete - Smart undo toast with a 4-second window that cancels the network request if triggered

Email view

- Full thread rendering with inline attachments - Distraction-free compose with reply and forward support

Search

- Offline search across cached threads - Online search falling back to the Gmail and Outlook APIs

Multi-Account & Unified Inbox

- Support for multiple Gmail and Microsoft Outlook accounts simultaneously - Dedicated Unified Inbox view to see all emails from all accounts in one place - Quick account switching by swiping vertically on the profile avatar - Floating navigation bar to toggle between Primary Inbox and Unified Inbox

Account

- Google and Microsoft Sign-In, credentials never leave the device - Profile modal with account switching support and multi-provider "Add Account" dialog - Support for up to 10 connected accounts simultaneously

Settings

- Configurable swipe gesture actions - Notification preferences

License

GNU General Public License v3.0