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

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