Which to buy Beat Vibe for iPad or Beat Vibe?

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  Depends on which device you have.

Beat Vibe is designed for iPhone/iPod touch. While it runs on iPad, it runs in the iphone compatibility mode (small window or double pixel one) which leaves a lot to be desired.

Beat Vibe for iPad has a UI that was specifically designed for the iPad which makes it a lot more usable on this device. However it will not run on the iphone/ipod.