The app doesn't work great generally, but during an update a few months ago they decided to change the color of the QR code from black to grey. Now every time I go to the gym I need assistance from staff to angle their card reader juuuuuust right in order for it to read. The staff tell me this happens with almost everyone and they don't k own why they would change the course of the QR code. They are black FOR A REASON.