Using the app is as easy as tapping the ‘check’ button and waiting a few moments. After a few seconds, you know whether or not you can use other devices with your Android, like USB drives, controllers, keyboards, cameras, etc.
USB OTG Checker is a really interesting app that lets you be sure your Android is compatible with OTG. If it is, it’ll open a new world of possibilities for you. If not, well, it’s not exactly the end of the world either.