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ElectronMailProton Mail
Free

The open-source software is available without a license fee. Hosting, hardware and…

 Freemium

Free accounts work in the mobile and web apps; the desktop apps are offered as a free…

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS, Web
  • Adds desktop-oriented features around Proton Mail.
  • End-to-end encrypted email by default
  • Apps for iOS, Android, macOS, Windows, Linux and the web
  • Requires a Proton account and depends on an external mail service.
  • Only works with a Proton account
  • Desktop apps need a paid plan after the trial
Downloadable app Downloadable app, Web application, Hosted service
Open source Closed source
License: GPL-3.0 License not stated
Not stated if an account is needed Account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 23, 2026

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