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Thunderbird vs Linwood Flow: catalog facts
Thunderbird	Linwood Flow
Free Free forever, funded by donations.	Free Free and open source under the AGPL 3.0.
Windows, macOS, Linux, Android	Windows, Linux, Android, Web
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	You decide where your data is stored Manages events, groups, places and people in one app
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	Developers state it is not ready for production use Nightly builds can be unstable
Downloadable app	Downloadable app, Web application
Open source	Open source
License: MPL-2.0	License: AGPL-3.0
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.