If your app is in the App Store. 1) Find the app online (Google for the iTunes link). For this example we use Apple Pages: https://itunes.apple.com/app/pages/id361309726?mt=8. 2) Copy the number after the id in the URL. (Here: 361309726). 3) Open https://itunes.apple.com/lookup?id=361309726 where you replace the ID with the one you looked up. 4) Search the output for "bundleID". In this example it looks like this (next to a bunch of other data): "bundleId":"com.apple.Pages". So for Apple, the bundle ID is com.apple.Pages.