Anything HomeKit is local-first. That's one thing Apple actually got right, and thankfully has pushed into the new Matter industry standard too. Won't work without some Apple device though of course.
I'm curious to see how matter will be adopted, it looks like almost everything will have a local method of control. I'm already using zigbee and z-wave and some local wifi interfaces. I love automating everything how I want and not worrying about any online services.
Is it local but fully delegated to Apple, or local as in I can actually get my hands on raw data and the control plane?