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BlueMail vs Thunderbird: catalog facts
BlueMail	Thunderbird
Freemium The client is free to download. Some features are reserved for paid plans.	Free Free forever, funded by donations.
Windows, macOS, Linux, iOS	Windows, macOS, Linux, Android
One inbox covers many accounts across Windows, macOS, Linux, Android and iOS with a consistent interface and shared…	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
It is closed source, some features need a paid plan, and its handling of account credentials has drawn…	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
Closed source	Open source
License not stated	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 September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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