Flutter App + Atlas App Services + Apollo

I am a little confused about the migration from [quote=“Emma_Lullo, post:1, topic:167589”]
Realm GraphQL API → Atlas GraphQL API
[/quote] to Apollo…

My app is made with Flutter and initially, I don’t want it to have a back-end attached. So where exactly should I put Apollo? Inside the app, on the client’s side? Is there a package for Flutter?
Or should I install it in Atlas Functions?

It is not clear to me how to put together those pieces. Can anyone help me?