...maybe not what you're looking for, but both an Outlook calendar and a Google/Gmail calendar can be shared with nominated individuals.
I use the facility in Outlook, but I believe the capability is very similar in Gmail.
I'm working from memory here, but I believe that in both cases you can create an additional, dedicated shared calendar, but the set-up and sharing has to be done by logging on on a computer (the App doesn't support that bit - though once set up the sharing is available on the app).
Patently, both users need a Gmail or Outlook email address, but these are easy and free to obtain if needed.
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A shared calendar? new
A shared calendar? new