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Thunderbird vs Axichat: catalog facts
Thunderbird	Axichat
Free Free forever, funded by donations.	Free Free and open source under AGPL-3.0, including the @axi.im service.
Windows, macOS, Linux, Android	Windows, macOS, Android, iOS, Self-hosted
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	Email and XMPP chat in one conversational inbox Integrated calendar with tasks and reminders
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	Under active development, so things may break No Linux build yet
Downloadable app	Downloadable app, Self-hosted, Hosted service
Open source	Open source
License: MPL-2.0	License: AGPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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