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Spark Mail vs FairEmail: catalog facts
Spark Mail	FairEmail
Freemium Free for individuals; paid plans add AI features and team tools.	Free Free to download from Google Play, F-Droid or GitHub releases.
Windows, macOS, Android, iOS	Android
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	No Microsoft Exchange Web Services or ActiveSync support Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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