I am new with Firebase and I have heard that there is a limit for simultaneous connections. My app doesn't require to store who is online at a specific moment, just some details about each account(name, picture, etc.). So, I do not know if those limitations will apply to this type of app or not. If they do, what is the limit? In a previous post somebody said it is 100,000 users, but on their documentation I have found something about 1,000,000 users (Maximum concurrent connections for mobile/web clients per database 1,000,000). Furthermore, there is no mention for simultaneous connection on their price calculator. Also, if I have misunderstood anything about "simultaneous connections", please explain here. Have a good day and thank you for your time!
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There is no cost for simultaneous collections. See my answer to Price for simultaneous database connection in firebase.
The Firebase Realtime Database allows up to 100 concurrent connections per project on its free plan, and up to 200,000 concurrent connections per database on its paid plans.
Cloud Firestore allows up to 1,000,000 concurrent connections per projects, on both the free and the paid plan.
These limits is regardless of the application type, and depends on how your code uses the database. Since you didn't share (and it seems didn't write) any code yet, it's hard to say more.