Compare software

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