you can install it on your iPhone. though I don't believe it responds to "ok google" and you need to manually launch the app
Apparently you can set up a Siri shortcut to say "Hey Siri, OK Google" - messy and I haven't tried it, but one could if so inclined. Google assistant is smart, but my parents have one and say it doesn't always understand or hear them. That could be user error too, I will admit.
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