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