No one wants to pay twice for the same thing if they can avoid it, even if it's just a $0.99 app. If you have more than one iPhone, iPad, or iPod touch, you may be wondering whether you can install apps you buy from the App Store on all your devices for free, or if you have to purchase the app for each device.

I have good news for you: iOS apps you purchase or download from the App Store can be used on any compatible iOS device you own, as long as they all use the same Apple ID.

App purchases are made using your Apple ID (just like when you buy a song, movie, or other content). The purchase gives your Apple ID the right to use that app. So when you try to install or run that app, iOS checks to see if the device you’re running the app on is signed in with the Apple ID that was originally used to purchase the app. If so, everything works as expected.

Make sure you sign in with the same Apple ID on all your devices and that you have purchased all apps with the same Apple ID. Then you will be fine.