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Geary vs Claws Mail: catalog facts
Geary	Claws Mail
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the GPL 3.0 or later.
Linux	Windows, macOS, Linux
Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…	Opens and searches enormous mail folders without stalling Plugins for PGP, spam filtering, RSS and calendars ship with it
It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.	Composes plain text by default; HTML mail sending is deliberately limited The interface is functional and looks like it was designed in 2004
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License: GPL-3.0-or-later
Not stated if an account is needed	No account 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 21, 2026

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