This is Frontmost, an app that lets you tap and launch commands from your Android device. It's like a command-line interface for your phone.

You can use Frontmost to find out what your phone is doing at any moment, and also to control it. For example, you can use Frontmost to launch a website or search for a particular file.

The most important thing is that you can do all of this without having to learn a single line of code.

You don't need to install anything. All of the commands are available right away. You can tap on any of the available commands to find out what they do.

You can also customize the size of the markers on the topmost screen.