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

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