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Gridlink Mail vs FairEmail: catalog facts
Gridlink Mail	FairEmail
Free Free and open source under GPL-3.0.	Free Free to download from Google Play, F-Droid or GitHub releases.
Android	Android
Supports JMAP and classic IMAP and SMTP Includes JMAP contacts and calendar support with CardDAV and CalDAV alternatives	Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in
Android only A fork of Sterna Mail with a separate release and support path	No Microsoft Exchange Web Services or ActiveSync support Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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