Используйте приложение APKPure
Историческую версию Popup Notes можно получить на Android
Это приложение поможет вам установить заметки на всплывающее окно поверх любых приложений.
In this app you can manage your to-do list or your you can use this app as your continues reminder for your stuffs or work.
There will be a popup in which you can write your works your any stuffs which will be always on top of every app or you can minimize it by draging it to left side.