SnapScan

This is a free and simple QR&barcode scanner application. Can scan codes easily. You can see what you have scanned before.
And you can even scan in the dark area with flash feature. This app is totally free and does not contain any ads

A QR (Quick Response) code and barcode scanner application is a mobile software program that allows users to scan and decode two-dimensional barcodes and QR codes. The application is designed to provide a quick, efficient, and convenient way to access information stored in these codes, which can range from simple product information to more complex digital content such as URLs, email addresses, and contact information.