How to scan a QR code safely using your smartphone

CyberGuy shows you how to scan using your iPhone. Can you recommend a QR code reader that one will not be required to set up an account? In the App store, they all contain ads and in-app purchases. Many want you to allow them access to a lot of non-germane information in order to use it. I had an app for years that did not require one to bear one's soul and did not require access to one's phone activities.