Tracker app for users to use with their clients

Which database would I use if I wanted to create an app which allows users to track progress of their clients and in real-time. For example, the app would be downloaded by both coach and his/her client. the client would input data which would be accessible by both parties and enable feedback in real-time. thanks!

you can use firebase database it will easy to use and give more features to your app for real time uses

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thanks for answering my Q. firebase would allow for users to interact with their clients? Do you know of a good tutorial?