Compare software

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

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