title: Number of maximum apps that can be connected in database
body: <p>I want to know how many android and ios application I can connect with Firebase(mainly for cloud firestore) OR mongodb, and what does it mean by &quot;visible apps&quot; in the firebase.</p>
  <p><a href="https://i.stack.imgur.com/KjDCu.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KjDCu.jpg" alt="the part I've marked in red" /></a></p>
  <p>the part I marked in red and what does it matter if an app is visible or not.</p>