Does the ecobee Smart Thermostat Lite work with HomeKit, Alexa, and Google Home?
The Smart Thermostat Lite is sold through local HVAC professionals.
It is the installer-channel model, with a 2.8 in touchscreen, and it works with SmartSensors, HomeKit, Alexa and Google. It suits HomeKit and Home Assistant users, with native support through local Wi-Fi control. Google Home and Alexa 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.