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Geary vs Thunderbird: catalog facts
Geary	Thunderbird
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free forever, funded by donations.
Linux	Windows, macOS, Linux, Android
Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.	The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License: MPL-2.0
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 20, 2026

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