This is a bit of a rabbit hole, but here’s my setup:

I use Google Home as my voice assistant, several throughout the house. I also self host OpenHab (for connection between Google and my smart home. Also for their tablet interface) and Node-Red ( for the actual logic. OpenHab is more complicated than I would like. Node-Red is easier for me. Also Node-Red and OH talk to each other, so no worries there). I also host my own MQTT server which I use to control my devices.

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I use several Sonoff devices flashed with a custom firmware called Tasmota. This allows them to be used completely offline as long as the MQTT server is up in my house. If the internet ever goes out, I cannot use Google to control anything, but the tablet on my wall is fully functional as well as the app.

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If you already have Kasa lights, then Home Assistant may be the way to go for you, but I can’t vouch for it as I don’t use it. I built my system from the ground up with local control in mind. It’s more work up front, but when something isn’t functioning I know why

Big fan of Motioneye