One way hackers attack mobile users is to put stickers with QR codes over the original QR codes on flyers etc, the URL of the sticker version presumably redirects you to malicious websites etc rather than the one you were expecting. Norton Snap QR Code Reader checks the URL before taking you there (unlike most QR readers, that just take you to the URL in question directly).
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Pro Totally free
There is no cost to this app and there are zero in-app-purchases. This is great for those that want to protect their device but do not want to spend funds on such a thing.
Con Difficult to take photos of multiple QR codes
If there are multiple QR codes in the same vicinity the app does not give the user a choice on which one they are trying to capture, leading to the incorrect QR code being snapped.