T2QT is the best app for those who want to become a QR code master.
T2QT can read QR codes quickly. It can also be used as a base for creating new QR codes.
You can create a QR Code of your choice by specifying the color and shape. The function to embed the created QR Code in an image is provided, allowing you to add your original QR Code to virtual backgrounds and flyers.
QR Codes that have been read or created are automatically stored in the history. You can search for previously scanned QR codes or reuse QR codes you have created.
Android
https://play.google.com/store/apps/details?id=com.kotahayashi.t2qr
iOS
https://apps.apple.com/app/id1518590005