Open the app, point it at a QR code or barcode, and it reads the code. There is no setup, no first-run tutorial, and no account.
Anything you scan is saved to a list inside the app, in case you want to find it again. The list lives on your phone. You can delete entries individually or clear the whole list.
There are no network requests of any kind. No ads, no analytics, no telemetry. The only thing leaving the phone is whatever you choose to copy or share yourself. It’s free because it has nothing to sell.