Just change the default search settings in the App store on the iPad from "iPad Only" to "iPhone Only" and repeat search.  The Fantag app is currently listed as an iPhone Only app.  

You may need to scroll down in the search results to find Fantag, but we are available on all Apple iOS (9.3 and later) devices in the United States.

You can also use this link on your iPad to download from the App Store (https://itunes.apple.com/us/app/fantag/id1207063634?mt=8)