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HEY vs Proton Mail: catalog facts
HEY	Proton Mail
Paid Paid subscription service.	Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…
Web	Windows, macOS, Linux, Android, iOS, Web
Screens first-time senders before they reach the inbox Email and calendar from one provider	End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web
Opinionated workflow that differs from traditional email Hosted service that requires a paid account	Only works with a Proton account Desktop apps need a paid plan after the trial
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.