I am a developer. I write apps for iOS, iPadOS and macOS. I wrote and currently maintain the following apps:
Qrafter® – QR Code Reader and Generator
Qrafter® is a QR Code and 2D Code scanner and generator for iOS and iPadOS. You can download it from https://qrafter.com/
PSWD – Password Generator
PSWD is a utility app for iOS and macOS. It can generate strong passwords that can be fully customized to suit your needs. You can find out more about it on https://keremerkan.net/pswd-password-generator/ or download it on the App Store.
SMS Checker is a self learning SMS filtering app for iOS and iPadOS, written using CoreML. Currently it is not for sale and will be replaced with a new app in the future.