The application allows you to generate a password depending on the fields filled in and the selected parameters. The password is always generated in the same way with the same fields and parameters at any time. This allows you not to remember or save a complex password, but you need to remember the entered data. There are hints for this. The app has ads, but it can work offline.
https://play.google.com/store/apps/details?id=com.e66t355.genpassfree