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Fastmail vs FMail3: catalog facts
Fastmail	FMail3
Paid Paid subscription with a 30-day free trial that needs no credit card.	Free Downloadable from the developer's site; the homepage does not list a price.
Android, iOS, Web	macOS
Email, calendar and contacts in one service Choice of EU or USA data residency	Native macOS windows and tabs with session restore Not built on Electron
No free plan after the trial Hosted service, so your mail lives on Fastmail's servers	Works only with Fastmail accounts Unofficial and not made by Fastmail
Downloadable app, Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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