Pretty but poor functionality
It looks pretty but you can do very little with the free app. I’d be happy to pay for the premium if the free app actually worked but it doesn’t work well at all. Updated to add: It appears it hasn’t been tested on smaller models of iPhone such as the SE because it’s impossible to change the settings on a smaller screen due to the layout. I wasn’t able to test it by cooking steak because I couldn’t get that far. It’s possible it works on larger screens but if you have a smaller screen it won’t work.