While Firestore has a Android/iOS/Web SDK, it also has great backend support (Python, Java, Node, Go, Ruby, C#, PHP) as well. The "realtime" features of Firesto

While Firestore has a Android/iOS/Web SDK, it also has great backend support (Python, Java, Node, Go, Ruby, C#, PHP) as well. The "realtime" features of Firestore are better suited for mobile IMO, but using Firestore as a scalable, consistent, document/nosql database for your backend is definetly a good use for it. I actually think most of the server SDKs don't even expose many of the realtime APIs. Maybe they will in the future, but it shows that you can use Firestore like a normal database just fine. (I work for GCP)