Does an app downloaded on one device automatically show up another device using the same Apple ID? If two people are sharing an Apple ID and one decides to download an app on their device will it show up downloaded on the other persons device? This may sound like a crazy question but I am pretty certain it can't happen but I was wanting to double check.
If two devices have the same AppleID (typically what would happen if you have an iPhone and an iPad), then if an app is download on one device, it will change the icon in the App Store to show a cloud with an arrow rather then the "Get" or price button.

Additionally, depending on the iTunes &amp; App Store settings in the Settings app, the apps may automatically download to the other device.