Count Caddy from Tickle Tap Apps is an app that simply allows your kid to drag items from one side of the device to the other. The counting starts by ones and then progresses through twos etc. It is a visually appealing app with great use of sounds.
Did my 2 1/2 year old like it? Yep! She loved it. She was quick to learn how to swipe her finger — this took a minute to learn. The sounds kept her interested and it was really reinforcing the counting exercises we do outside the application. She wanted to play with it well into the 5+ minute mark and obviously she was having fun (see the video). She was learning hand eye coordination at a really detailed level at least those couple of fingers 
It is worth the $? Yes it is. In the app store it is a few bucks and well worth the money.
Here is how I rank it:
Learning: 5/5
Fun: 4/5
Attention Capture: 4/5
Not too bad at 13/15.
Age: 5 and under (as recommended by the publisher: 3-5)
Video: