On iPhone, iPad and Mac — including the writing tools that rewrite your messages.
Apple ships this as a headline feature, which means it is switched on and woven through Messages, Mail, Notes and Siri. It is also one of the more honestly controllable ones — Apple does provide settings, though they sit in more than one place.
You went looking for the setting and either it wasn't where you expected, or it was and it didn't stick. That's the pattern across all of this — and it's why we test each one on a real device rather than repeating what a listicle said in March.
We work each of these out properly — on a real phone, a real laptop — and send the step-by-step to the list. One email a month, covering what changed and exactly how to switch it off.
Your email address, nothing else. One click to leave.
Apple provides settings for Apple Intelligence, though the controls sit in more than one place across iPhone, iPad and Mac, and some features have their own separate toggles.
Apple Intelligence altered Siri's behaviour on supported devices, so switching it off can affect how Siri responds.
Google's AI Overviews — the summary above your search results — is the most-searched of the lot, and we've published the working method for it: how to turn off AI on Google →. Verified in a real browser, with the date on it.