Guitar chords-do I need to purchase for BOTH iPhone and iPad?

I purchased the guitar chords add-in on my iPhone. It is not showing up on my iPad after sync. Am I missing something or do I need to purchase again for each iOS device?

There is a "Restore purchases" button in the Store section of iReal b where you can download the in-apps that you purchased before.
You just need to be logged in with the Apple ID that you used for the original purchase.

Thanks very much!