Algoriddim Djay for iPad

Djay won't replace the professional equipment DJs spend thousands of dollars buying. As a novelty and DJ-for-Dummies guide, though, it's a fun tool.

Djay can access all the music on your iPad, so there's no extra loading of songs in the app. Tap the music note icon with a plus sign over it, and select a song—Djay takes a few seconds to analyze and load it, and the app then begins playing the song normally.

The real fun comes once you've loaded two songs, side by side on the screen’s two turntables. Once both songs are playing, you can fade between the two, change the volumes of each, sync the tempos with one tap, and mash-up songs like a real DJ.

You can make a number of adjustments to the playback, all with just a couple of taps.

The simplest way to use Djay is via the Automix—in my mind, the app’s best feature. What it does, essentially, is load a playlist, album or library, and play it like a party DJ would.