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FairEmail vs Spark Mail: catalog facts
FairEmail	Spark Mail
Free Free to download from Google Play, F-Droid or GitHub releases.	Freemium Free for individuals; paid plans add AI features and team tools.
Android	Windows, macOS, Android, iOS
Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
No Microsoft Exchange Web Services or ActiveSync support Android only	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is 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 September 22, 2026

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