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Aster Mail vs CounterMail: catalog facts
Aster Mail	CounterMail
Freemium Free plan with 10 GB of storage; paid plans start at $2.99 per month.	Paid Paid accounts; prices are listed on the provider's site.
Android	Web
Mail is encrypted on the device before it leaves 10 GB free with custom domain support	Automatic OpenPGP encryption with 4096-bit keys Diskless web servers that boot from CD-ROM
The app only works with astermail.org accounts Young project with a small user base compared with established providers	Paid service Closed source hosted service
Downloadable app, Hosted service	Web application, Hosted service
Open source	Closed source
License: AGPL-3.0	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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