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Slow Mail vs Sterna Mail: catalog facts
Slow Mail	Sterna Mail
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later licence, with no ads.
Android	Android
No emails or message lists stored on the device Works with any IMAP and SMTP provider	Native JMAP support as well as IMAP/SMTP No tracking, ads or Google services
Needs an active internet connection to read mail Slower than clients with a local cache	Android only Young project still changing its interface often
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is 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.