For years, I've been using
Notezilla sticky notes.
The thing I depend on the most, is that it runs in the background so when it's time for a Stickie to "pop off", it will go to the forefront of everything else on the screen so that I have to put it to sleep or act on it, or whatever.
On to my question. Will
Notezilla do the same on BOTH the PC and Android?
It is vital that the Android version will run in the background, and "pop up". I tried installing it then making a note and setting a timer. Left it, then nothing happened when the time came. I clicked into the app, and it said it was overdue. No notification of any kind happened.