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Balsa vs Thunderbird: catalog facts
Balsa	Thunderbird
Free Free and open source under the GPL.	Free Free forever, funded by donations.
Linux	Windows, macOS, Linux, Android
Lightweight native GTK interface Fits in with the GNOME desktop	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Linux only Smaller feature set than full PIM suites	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: GPL-2.0-or-later	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 20, 2026

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