tDpiInfo is a free developer tool developed by Taosoftware Co.Ltd. for Android devices with OS 1.6 or later. It is a utility and tool application that helps developers check the pixel density of their device. With this app, you can easily check any pixel density of the device, including xxxhdpi, xxhdpi, xhdpi, hdpi, tvdpi, mdpi, and ldpi. The app icon changes depending on the density of the screen, which includes XXX, XX, X, H, T, M, and L.

One of the permissions required by the app is the CAMERA permission, which is used for collecting camera information. Overall, tDpiInfo is an incredibly useful tool for developers who want to check pixel density and other related information on their Android device.