Before buying any IOT devices, see if you can download the firmware from the manufacturer's website. If you can't, do not buy that product.
I like Shelly's doodads. They are easy to work with, you can flash their firmware with an alternative if you want (Tasamota is popular). They have a decent onboard scheduler and the only app you need is a web browser pointed at its IP address. They don't need internet access.
I like Shelly's doodads. They are easy to work with, you can flash their firmware with an alternative if you want (Tasamota is popular). They have a decent onboard scheduler and the only app you need is a web browser pointed at its IP address. They don't need internet access.