The name of the app speaks for itself: its main function is the recognition of QR codes. And it copes with the task well. Read speed is high, the errors practically does not happen. The application is simple to use because its functions include only the most important: the actual read codes, usage history, and several customizable parameters, including notification type, using the flash and auto focus and invert the QR code (can be useful if you need the code and is white on a black background).