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Proton Mail vs HEY: catalog facts
Proton Mail	HEY
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Paid Paid subscription service.
Windows, macOS, Linux, Android, iOS, Web	Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Screens first-time senders before they reach the inbox Email and calendar from one provider
Only works with a Proton account Desktop apps need a paid plan after the trial	Opinionated workflow that differs from traditional email Hosted service that requires a paid account
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 23, 2026

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