Don't install spyware on your phone!
This QR reader does not require sneaky, strange and useless permissions just for the sake of stealing your data. There aren't ads, trackers of any sort and what do you scan remains on your phone. The only requested permission is for the camera.
Scan and be safe!
The app is open source, you can inspect to code: https://github.com/prof18/Secure-QR-Reader