I don’t work for Realm, so I can’t speak about their policies. Realm appears to have a 30 day free trial on their cloud computing solution — after that it is about $30/month for the least expensive plan. Realm provides an admin Realm Studio desktop app, not a web based admin portal. Frankly, I prefer a desktop app to a web app, but then again I am old school.

The real advantage I find with Realm is the unified data model between the client and cloud platforms. With Firebase/Firestore there was always a translation layer between the cloud based JSON data and the Swift class structures. I also found that Realm’s subscription metaphor was easier to handle than FIrebase’s listener architecture. With subscriptions you only need to make them once, and they persist accross instances.