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Sterna Mail vs Ltt.rs: catalog facts
Sterna Mail	Ltt.rs
Free Free and open source under the GPL-3.0-or-later licence, with no ads.	Free Free and open source under the Apache 2.0 licence.
Android	Android
Native JMAP support as well as IMAP/SMTP No tracking, ads or Google services	Native JMAP support Simple, focused interface
Android only Young project still changing its interface often	Works only with JMAP servers, not IMAP Described as a proof of concept
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0
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.