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Proton Mail vs Mailo: catalog facts
Proton Mail	Mailo
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Freemium Free sign-up, with a paid Pro offer for businesses and organisations.
Windows, macOS, Linux, Android, iOS, Web	Android, Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Data stored on servers in France and not used or sold Choice of address domain
Only works with a Proton account Desktop apps need a paid plan after the trial	Mainly aimed at French-speaking users No end-to-end encryption mentioned
Downloadable app, Web application, Hosted service	Downloadable app, 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 October 2, 2026

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