Agreed on the lack of any functionality for ages. I still don't think (in Android; I can't speak for iOS) the built-in app is viable. It only detects in insane

Agreed on the lack of any functionality for ages. I still don't think (in Android; I can't speak for iOS) the built-in app is viable. It only detects in insanely optimal conditions, and non-optimal scans produce no errors or diagnostics to the user: you can very likely be doing everything correct, be aiming the camera in such a manner that there is adequate lighting & pixels to scan a QR code, and get bumpkiss — and further, you'd have no idea the feature even exists … whereas a dedicated app will scan it instantly with the same image, and if you don't get it, you know that the app is capable of it and you probably just need to move closer. (Also, the app I have has a decent viewfinder showing you how much it needs, and it shows visible feedback about what it is finding, even if it can't make a full match.)