Conventional wisdom says that mobile devices are for content consumption, but content creation is the realm of laptops and desktops. Sure, you see "created using nothing but an iPad" every once in a while, but if you're looking at something professional, odds are good that its creator used a reliable mouse and keyboard at some point. Then along comes an app like Cross DJ, challenging our notions of what can be done on a touchscreen and ARM hardware.

As you might have guessed from the title, Cross DJ is a DJ app. But this isn't just a way to create and edit your ever-growing collection of Zelda MIDI files - the app emulates and replicates the function of a real DJ controller, complete with live output and recording. Open up two tracks from your on-device library, then remix to your heart's content, with touchscreen simulacrums of equalizers, syncing and timing tools, various musical filters, and whatever you call those big record player things. (Yeah, I know nothing about the technical side of being a DJ.) Those who are familiar with these tools might actually find at least one feature to be better than a real controller: you can instantly tap to any point on either song in the deck, complete with a progress meter and a bookmark function.

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Of course Cross DJ is probably a bit intimidating for anyone who hasn't done this sort of thing before. That's where the capitalized Quantize feature comes in, automatically setting loops and hot cues to your currently assigned beat. Other user-friendly options are peppered throughout the app, not least of which is the snazzy user interface. It doesn't hurt that the blue and orange imagery and radial design is reminiscent of Valve's Portal puzzle game.

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While it won't replace a full DJ controller, Cross DJ looks like a great option if you're just starting (or you want to travel light). It's a reasonable $5 on the Play Store with no in-app purchases, and it should work on both smartphones and tablets running Android 4.1 or later.

Cross DJ Pro - Mix your music
Cross DJ Pro - Mix your music
Developer: Mixvibes
Price: $8.99+

Mixvibes introduces the 1st pro DJ app on Android Cross DJ, a popular iOS DJ app developed by Mixvibes, launches its long ­awaited Android app. “Our users kept complaining that there was no decent DJ app on Android. So we started thinking: Hey, why not bringing our expertise in pro DJ software to this platform?” says CEO Eric Guez. A few months later, after having overcome many technical limitations, Cross DJ is the world’s first Android app that offers pro DJ tools in an intuitive design.

Mix tracks in perfect sync

Cross DJ detects the BPM of your tracks, right down to the last decimal. Why? Because it has the same engine as its desktop version. Sync your tracks once, and they’ll never go out of phase. You can tell by looking at the parallel waveforms, to visually check if your tracks are synced. Also, if needed, you may manually adjust the pitch & pitch bend. And if you're into complete customization of your tracks, you can edit the down­beat with just one press of a button.

Exclusive Quantize mode

Eric Guez says: “We know from experience that mixing on a small screen can be tricky. That’s why ­ in addition to having optimized the app for 4”, 7” & 10” screens ­ we introduced an exclusive Quantize mode. It basically keeps on the beat all the actions you perform.” Set a hot cue or a loop, and Cross DJ puts it automatically on the beat. This also works with the peak ­view waveform. Fast­ forward with just a touch: the music goes on seamlessly.

Outstanding audio performance

Cross DJ for Android stretches the boundaries of audio on Android. With its incredible low latency, music instantly reacts to your actions. To test how good it is, try the scratch feature and hear its extremely realistic sound. Another nice example is that there is virtually no loading time when starting­ up the app.

Complete DJ system

The app replicates the industry standard DJ setup: 2 decks, 1 cross fader and a full­ fledged 3­band EQ mixer. Tweak your sound with 15 awesome effects, just by swiping on large effect pads. Remix your tracks with 16 hot cues pads. As Eric Guez states, “Cross DJ is the easiest way to start DJing. When you step up to regular decks, you are already familiar with the industry standard layout.”

Access your music and record

Direct access to your device’s music, with multiple sorting options (title, artist, album, BPM or length). Record your mix for an unlimited time, and save it in high quality. Edit your mix info, share it or remix it directly within the app.

Tech specs
● Accurate BPM detection
● Sync button: one ­press, and the 2 tracks never go out of phase.
● Manual pitch & pitch bend.
● Set master down­beat, to make sure that your old tracks sync correctly.
● Parallel waveforms mode to visually check if your tracks are synced.
● New Quantize feature: hot cues and loops are automatically set on the beat.
● Smart­ seek: Tap on the waveform to fast­ forward & get a seamless jump.
● Low latency: music reacts instantly to your actions.
● Extremely realistic scratch sound.
● 15 effects (Bi­filter, Low­pass, Hi­Pass, Delay, Echo, Phaser, Flanger, Bliss, Brake, Roll, etc.)
● No loading time when starting­ up the app.
● 2 turntables, crossfader, full­fledged 3­band EQ mixer.
● Direct access to your music: mix your device’s MP3s, AAC and more.
● Sort your library by title, artist, album, BPM or length.
● Large control pads: XY effect pad, 16 hot cues pads.
● Auto loops (1/32 to 32 beats) and slip mode loops
● HQ live recording of your mixes.
● Optimized for display on 4”, 7” & 10” devices.