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Proton Mail vs Mailvelope: catalog facts
Proton Mail	Mailvelope
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Free Free and open source for personal use. Business products are paid.
Windows, macOS, Linux, Android, iOS, Web	Browser extension
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Works inside existing webmail rather than requiring a desktop mail client Keys stay in the browser under your control
Only works with a Proton account Desktop apps need a paid plan after the trial	Only supports a defined list of webmail sites Browser-based key storage is weaker than a dedicated client or smartcard
Downloadable app, Web application, Hosted service	Browser extension
Closed source	Open source
License not stated	License: AGPL-3.0
Account needed	Not stated if an account is 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 22, 2026

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