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Linwood Flow vs Thunderbird: catalog facts
Linwood Flow	Thunderbird
Free Free and open source under the AGPL 3.0.	Free Free forever, funded by donations.
Windows, Linux, Android, Web	Windows, macOS, Linux, Android
You decide where your data is stored Manages events, groups, places and people in one app	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Developers state it is not ready for production use Nightly builds can be unstable	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, Web application	Downloadable app
Open source	Open source
License: AGPL-3.0	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 October 2, 2026	Official website Full listing and sources Checked September 20, 2026

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