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Mailfence vs Aster Mail: catalog facts
Mailfence	Aster Mail
Freemium A free account is available, with paid plans for more features.	Freemium Free plan with 10 GB of storage; paid plans start at $2.99 per month.
Android, iOS, Web	Android
OpenPGP encryption and signing in the browser Standard IMAP, POP and SMTP access	Mail is encrypted on the device before it leaves 10 GB free with custom domain support
Hosted service only Advanced features sit on paid plans	The app only works with astermail.org accounts Young project with a small user base compared with established providers
Downloadable app, Web application, Hosted service	Downloadable app, Hosted service
Closed source	Open source
License not stated	License: AGPL-3.0
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 October 2, 2026

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