Grid Tool is a free utility program for Android developers that allows them to draw a grid on top of the phone screen. This tool is especially useful for UI testing, analyzing other apps, or as a drawing utility for artists. With Grid Tool, you can easily customize the grid to your liking and use it as a reference for your designs.

One of the best things about Grid Tool is its floating menu, which allows you to draw over other apps without having to switch back and forth. This feature makes it easy to test and analyze different apps, as well as use it as a drawing tool for artists. Plus, the app only requires the "Display over other apps" permission, so you can use it with peace of mind knowing that it won't access any additional data on your phone.