I’ve seen some people on Reddit, Twitter, and other communities on the web setting up old iPads as dedicated HomeKit controllers — using the Home app in kiosk mode. This is certainly nice to have when guests come over who have Android phones without access to the Home app or who you’d prefer not to invite to control your HomeKit gadgets from their own device.
I don’t plan on setting this up now. But maybe when I buy my next iPad, I can repurpose my Air 2 in this way.
➝ Source: howtogeek.com