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FairEmail vs Slow Mail: catalog facts
FairEmail	Slow Mail
Free Free to download from Google Play, F-Droid or GitHub releases.	Free Free and open source under the MIT licence.
Android	Android
Works with nearly all IMAP providers and unlimited accounts OpenPGP and S/MIME encryption built in	No emails or message lists stored on the device Works with any IMAP and SMTP provider
No Microsoft Exchange Web Services or ActiveSync support Android only	Needs an active internet connection to read mail Slower than clients with a local cache
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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.