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Apple Mail vs FMail3: catalog facts
Apple Mail	FMail3
Free Included free with macOS, iOS and iPadOS.	Free Downloadable from the developer's site; the homepage does not list a price.
macOS, iOS	macOS
Preinstalled on Mac, iPhone and iPad Supports iCloud and other email providers	Native macOS windows and tabs with session restore Not built on Electron
Only available on Apple devices Closed source	Works only with Fastmail accounts Unofficial and not made by Fastmail
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.