iOs7 temporary not supported :(
QR Master is the fastest and most user-friendly QR reader and barcode scanner available.

Scan is completely free. There are no locked features or version restrictions. It is just simple QR code and barcode scanning the way it should be. Open the app, point the camera at the code and you’re done! No need to take a photo or press a "scan" button.

When scanning a QR code, if the code contains a website URL, you'll automatically be taken to the site. If the code just contains text, you'll immediately see it. For other formats (such as phone numbers, email addresses, or contact info), you will be prompted to take the appropriate action.

Scan now reads regular barcodes (UPC, EAN, and ISBN) and gathers information about the products you scan, allowing you to research and find places to purchase the products you love.
Note: Barcode scanning requires an iPhone 3S/4/4S or the new iPad in order to work reliably (the camera in other devices does not provide the detail/focus required for barcode scanning).

ADDITIONAL FEATURES:

• Forward-facing light for scanning
• History logs (including date and time) of all of your past scans