Lacking options, but good
It most certainly does the trick for simple scans. But if you want to scan something more complicated, for example a wifi connection qr-code, it won’t work. Since the AppStore is indigenous and unique to iOS, you most likely have the possibility to scan qr-codes directly from the iPhone camera app (with more features than this app has) if you are running iOS 11 or higher that is. However... a sweet feature is the ability to create your own qr-codes.