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Proton Mail vs GMX Mail: catalog facts
Proton Mail	GMX Mail
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Free Free, supported by advertising and sponsored content.
Windows, macOS, Linux, Android, iOS, Web	Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Up to 10 addresses on one free account Mail collector for other email accounts
Only works with a Proton account Desktop apps need a paid plan after the trial	Web portal shows sponsored news and ads Hosted service, so you rely on the provider for your mail
Downloadable app, Web application, Hosted service	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 24, 2026

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