It may sound crazy, but there’s an app for that. KL Dartboard turns your iPad into a virtual dartboard and you use your iPhone to throw virtual darts at the virtual board.
Don’t worry, you won’t be physically throwing your iPhone at your iPad. Instead, to throw darts, you shake your iPhone and your actions will be transmitted via Bluetooth to your iPad.
KL Dartboard for iPad is US$3.99, and the iPhone app is free. The app supports up to two players.
Hit the link to download the app from iTune