Gamepad Tester is an Android app developed by elron that allows you to check and configure gamepads and other input devices. This free app also lets you rebind buttons and axes via .kl files, but it requires root access. It supports Bluetooth and OTG gamepads and offers a range of functions, such as showing pressed buttons and axes, creating, reading, writing, deleting .kl files, making backups and restoring .kl files, and showing info about connected devices.

It is worth noting that using root-permissions can be risky. Therefore, it is essential to make a backup before any actions. Gamepad Tester is a useful and straightforward app for gamers who want to test and configure their gamepads and other input devices.