Two different apps are recommended for its operation. The one with which I managed to connect immediately is "smart life". With the other one (smart rm), I admit that I found it difficult. After 1 month of use and 3 power outages, I am extremely satisfied. I was initially disappointed by the incorrect reading of the internal temperature, but I found out that you can calibrate the sensor through the app. You place a room thermometer next to it and adjust the actual temperature exactly. You can also connect an external sensor, but it seems excessive to me. Its operation through the app is very easy and straightforward. It also provides full programming per day of the week and time, but I haven't automated it that much. It is enough for me to turn on the radiator before I return home, I don't worry if I forgot to turn it on and I control the heating from bed. As for the design, it is very nice even with the box (additional 5 euros). It is good to have an electrician connect it so you don't cry about it. I haven't encountered any connection problems and after a power outage, it starts its operation normally without needing adjustments. I use it for an oil burner.
The instructions were not very informative, you have to try a little. That was the only negative and annoying thing.
I don't have an opinion on "Alexa", "Google assistant" matters because they escape me

The product is very good. Be careful if you don't know about connections, ask first. It can provide a dry contact command for a gas boiler and also for a 220V solenoid valve. The screen elements are white, not blue like in the photo. The connection to the internet is made by following the instructions. I installed 3 in a precise residence and they look very nice. The front glass is excellent. Be careful to order the box for external or built-in installation. If it is going to be placed in a wall that is empty from behind (plasterboard, wood), a box is not needed.

After much trouble, it connected to the network and the app. To avoid any difficulties, you should set the fac to 32 in the settings, otherwise it will not connect to the wifi