Compare software

Infomaniak MailK-9 Mail
Freemium

A free address with 20 GB storage is available; other Infomaniak mail plans are paid.

 Free

Free and open source.

Android Android
  • Open-source Android client
  • Free address with 20 GB of storage and no ads
  • Open source with a long track record on Android
  • Now the foundation for Thunderbird's official mobile app
  • Only works with Infomaniak-hosted addresses
  • F-Droid version lacks push notifications
  • Android only, no iOS version
  • Interface is more utilitarian than modern polished mail apps
Downloadable app, Hosted service Downloadable app
Open source Open source
License: GPL-3.0 License: Apache-2.0
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.