title: Can I use Appium run test for other's app?
body: <p>Can i use Appium to test an app that i download, which were not developed and package on my mac?</p>
  
  <p>I try to do this on an iOS app. But when I Launch it, it crash immediately every time. </p>
  
  <p>Why? And is it possible on Android? Thanks for help.</p>