Every week Apple gives away a free app for iOS, and this week’s app is a puzzler.

Dipticis a photo editor much like Instagram. It has filters and lets you build a gallery of photos. It has filter, color correctors, and probably more than the average amateur photographer needs to take pictures with the iPhone.

The puzzle here is why you would have paid a buck for this app when Instagram is free. But today that doesn’t matter, because this app is free in iTunes.

iTunes