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