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

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