QRSpell: On-Screen QR Scanner

Free to download and use. On-screen QR code scanning, scan history, QR code generation, and customization are available at no cost. Optional one-time support purchases and an annual support subscription are available for users who wish to support development. These purchases do not unlock or restrict any functionality. No ads.

Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/