Multi people shopping list

hi, I appreciate your advice in creating simple app that can share data between 2 or more people,
I thought about shopping list at the beginning as it looks like idea of sharing data about products we buy is clear.
Did anyone made something similar to share some date under one app?
I mean that if few users has that app, they can make changes in data base, and those permanent changes are visible for others.

This is possible using:

  • the CloudDB in real time CloudDB
  • the FirebaseDB in real time FirebaseDB
  • by using a GoogleSheet in GoogleDrive and Sharing it.

thank you,
I'll test it