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I would assume that the OS X TTS engine is the same as Siri's as it would be available in High Sierra.

Is the one in Sierra different from Siri in iOS 10?

> I would assume that the OS X TTS engine is the same as Siri's as it would be available in High Sierra.

Nope, macOS uses a different set of voices for TTS, which are named differently as well. They work offline and are nowhere as good as Siri.

I haven't needed to use Siri on my Mac, but presumably that's using the same stuff as iOS?

We're talking about the MacOS TTS engine accessible via the `say` utility and (I believe) accessibility tools, not Siri which is presumably a different software stack and which uses remote processing.

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