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Proton Mail vs AOL Mail: catalog facts
Proton Mail	AOL Mail
Freemium Free accounts work in the mobile and web apps; the desktop apps are offered as a free…	Free Free email account.
Windows, macOS, Linux, Android, iOS, Web	Web
End-to-end encrypted email by default Apps for iOS, Android, macOS, Windows, Linux and the web	Free mailbox from a long-established provider Built-in spam filtering
Only works with a Proton account Desktop apps need a paid plan after the trial	Hosted service, so you rely on AOL for your mail Few distinguishing features compared with other free providers
Downloadable app, Web application, Hosted service	Web application, 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 September 24, 2026

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