Does the Shelly 1 Gen4 work with HomeKit, Alexa, and Google Home?
The Shelly 1 Gen4 comes set up for Matter.
It is a one-channel in-wall relay with Wi-Fi 6, Bluetooth and Zigbee. It suits HomeKit users, with native support through Matter over Wi-Fi. Home Assistant users get native support through Zigbee. Google Home, Alexa and SmartThings users reach it through an integration (the maker's cloud).
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.