Does the tado° Wireless Smart Thermostat Starter Kit V3+ work with HomeKit, Alexa, and Google Home?
The Wireless Smart Thermostat Starter Kit V3+ contains a Wireless Temperature Sensor, a Wireless Receiver and an Internet Bridge.
The UK version has a receiver with hot water control. It suits HomeKit users, with native support through the maker's hub. Google Home, Alexa and Home Assistant users reach it through an integration (the maker's hub).
How the device gets into the platform on this route. The headline is the best route: local before cloud, direct before bridged, core before community. The methodology page lists every level.