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Tuta Desktop vs Proton Mail: catalog facts
Tuta Desktop	Proton Mail
Freemium A free account with limited storage and one address. Paid plans add custom domains…	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
End-to-end encrypts mail bodies, subject lines, calendar and contacts Password-protected messages to recipients who are not Tuta users	End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web
No IMAP or SMTP, so third-party mail clients cannot be used A Tuta account is required; it is not a general mail client	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
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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