title: Choose the bundle identifier for an iOS and Mac app
body: <p>Suppose that I have an app called <strong>A</strong>.</p>
  
  <p>Bundle Identifiers must be unique across all Mac and iOS apps. This means that if I have the app <strong>A</strong> on the iOS App Store with the Bundle ID <code>com.mycompany.a</code>, I cannot create an app on the Mac App Store with the same Bundle ID <code>com.mycompany.a</code>.</p>
  
  <p>Ok, said that, what is the best way to distinguish the Bundle IDs?</p>
  
  <p>Some examples I can think of:</p>
  
  <ul>
  <li><code>com.mycompany.a_ios</code>, <code>com.mycompany.a_mac</code></li>
  <li><code>com.mycompany.ios.a</code>, <code>com.mycompany.mac.a</code></li>
  </ul>
  
  <p>Are there others that come to mind? Which you used?</p>