This comes straight from Proton Mail’s own GitHub page, and it’s free. Need help installing?
About this app
Proton Mail is the official Android app for a Proton Mail inbox, the encrypted email service run by Proton in Switzerland. The encryption happens on your phone, so you read and write mail as normal while the contents stay unreadable to anyone in between.
The app was rebuilt from scratch and the whole source is published here under the GPL. The team is working through its own roadmap at the moment and is not accepting outside issues or pull requests, so this is code you can read and build rather than a community project.
You need a Proton account to use it, and it will not connect to Gmail, Outlook or other mailboxes. Proton's servers are not open source, and release builds send crash reports to Sentry.
From the app’s home page
- See the codeHow it’s made, every line is public
- WebsiteThe app’s own home page
- Questions & commentsTalk with the people who make it
- Report a problemTell the makers something is broken
- All versionsOlder downloads and what changed
- LicenseThe rules for using and sharing it
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