QR Code Reader and Barcode Scanner - QR Scanner is a free app that lets you scan QR codes and barcodes to get all the details of an item or service. You can use it on any device, but you should have a working camera and be able to take a photo or scan it from your device's gallery. In addition, you can save the codes in history and use them later.

The app is completely free and easy to use. You don't need to do anything special, just open the app and start scanning. It is designed to work with Android devices.