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Seznam Email vs Proton Mail: catalog facts
Seznam Email	Proton Mail
Free Free email accounts.	Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…
Web	Windows, macOS, Linux, Android, iOS, Web
Free addresses on several Czech domains One account covers other Seznam services	End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web
Interface and service aimed at Czech speakers Requires a mobile phone number to register	Only works with a Proton account Desktop apps need a paid plan after the trial
Web application, Hosted service	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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