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I'm not sure why it doesn't work offline, then. The UI refuses to load at all if I don't have an internet connection.

Native fingerprint auth can be implemented on top of a webapp; that isn't evidence either way.

Native app doesn’t guarantee “caches data for offline access”.

True. I seem to remember that the UI itself did not load when there's no internet connection, but I just tried it, and it does now. So maybe things have changed, or I misremembered.

Either way, no offline access in an email app... pretty bad.

It's not a native app. The main interface where you view your mailboxes, compose new emails, edit settings etc is a web view. The interface doesn't even load if you're offline, let alone your emails. Certainly some parts of the UI are native, but that's true of any web app.

I dunno if it's native or not, but the Fastmail app doesn't work when you're offline.