It allows you to quickly compute your Body Mass Index, using your weight and height. The app is embarrassingly simple: you just need to put your information and read the result on phones and Wear OS devices! Not even a button to push! (Ok, there are buttons, but they are to send the information by email, and to change the weight without reenter it, if you don't want to use them, you can...) This app supports TalkBack accessibility services and Wear OS smart watch.