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Proton Mail vs mailbox.org: catalog facts
Proton Mail	mailbox.org
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Paid Subscription email and workspace service that can be tried before committing.
Windows, macOS, Linux, Android, iOS, Web	Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Email, storage, meetings and office tools in one account Data hosted in Germany under GDPR
Only works with a Proton account Desktop apps need a paid plan after the trial	A hosted service, not software you run yourself Requires a paid subscription after the trial
Downloadable app, Web application, Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
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.