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StartMail vs Aster Mail: catalog facts
StartMail	Aster Mail
Paid Paid subscription with a 7-day free trial.	Freemium Free plan with 10 GB of storage; paid plans start at $2.99 per month.
Web	Android
Unlimited disposable aliases Encrypted mail to recipients without encryption via a password	Mail is encrypted on the device before it leaves 10 GB free with custom domain support
No free tier beyond the trial Hosted service only	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
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.