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Proton Mail vs Mailfence: catalog facts
Proton Mail	Mailfence
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Freemium A free account is available, with paid plans for more features.
Windows, macOS, Linux, Android, iOS, Web	Android, iOS, Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	OpenPGP encryption and signing in the browser Standard IMAP, POP and SMTP access
Only works with a Proton account Desktop apps need a paid plan after the trial	Hosted service only Advanced features sit on paid plans
Downloadable app, Web application, Hosted service	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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