Apple iPhone (iOS) Barcode Software
There is an abundance of barcode scanning applications and software available for the Apple iPhone.
Native QR Code Scanning
iPhones and iPads running iOS 11 or later can scan QR Codes with the native Camera application. The Camera app provides basic functionality for scanning QR Codes, but does not scan other barcode formats. To scan other barcode formats, download a 3rd party app such as the GoToTags iPhone App.