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Ltt.rs vs FairEmail: catalog facts
Ltt.rs	FairEmail
Free Free and open source under the Apache 2.0 licence.	Free Free to download from Google Play, F-Droid or GitHub releases.
Android	Android
Native JMAP support Simple, focused interface	Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in
Works only with JMAP servers, not IMAP Described as a proof of concept	No Microsoft Exchange Web Services or ActiveSync support Android only
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.