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Mailvelope vs Proton Mail: catalog facts
Mailvelope	Proton Mail
Free Free and open source for personal use. Business products are paid.	Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…
Browser extension	Windows, macOS, Linux, Android, iOS, Web
Works inside existing webmail rather than requiring a desktop mail client Keys stay in the browser under your control	End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web
Only supports a defined list of webmail sites Browser-based key storage is weaker than a dedicated client or smartcard	Only works with a Proton account Desktop apps need a paid plan after the trial
Browser extension	Downloadable app, Web application, Hosted service
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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