A SaaS like app

[Tina112]

I want to create a SaaS like appointment management app. Which I can create different users for from different organisations so they can use to book their appointments and manage them. 

I do not want access to client's data but rather they will all just be using my platform to input and manage their data.

Is this possible? What type of a license would I need?

[AleksiAlkio]

You would need to have the Security filter feature and that needs min. Core subscription.
https://support.google.com/appsheet/answer/10104977?hl=en&sjid=12667188037667078609-EU