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Thunderbird vs The Bat!: catalog facts
Thunderbird	The Bat!
Free Free forever, funded by donations.	Paid Commercial software from Ritlabs; prices are not listed on the product page.
Windows, macOS, Linux, Android	Windows
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	Optional encryption of the local message base Blocks tracking pixels and malicious code in mail
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	Windows only Commercial license required
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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