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Thunderbird vs Airmail: catalog facts
Thunderbird	Airmail
Free Free forever, funded by donations.	Freemium Available on the App Store; see the store listing for current pricing and subscription…
Windows, macOS, Linux, Android	macOS, iOS
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	Supports Gmail, Exchange, iCloud, IMAP, POP3 and more Unified and smart inboxes with snooze
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	Apple platforms only Pricing details are not stated on the homepage
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
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 September 23, 2026

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