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KMail vs Geary: catalog facts
KMail	Geary
Free Free and open source under the GPL.	Free The software is free under its open-source licence. Hosting, hardware and external…
Linux	Linux
OpenPGP and S/MIME encryption integrated rather than bolted on Shares contacts and calendar with the rest of the Kontact suite	Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…
Depends on the Akonadi storage service, which is a common source of problems Linux only in practice	It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: LGPL-2.1
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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