If you’re out and about looking for a professional mixing application for your iPhone or iPad, look no further than Traktor DJ by Native Instruments.
Not necessarily because it’s the best (which some would say it is), but because Native Instruments has slashed the asking price from $19.99 / €17.99 to zero!
The tool can be used for fun at home, as well as on stage coupled with other music tools. For instance, it lets you sync the sets you create in TRAKTOR DJ with TRAKTOR PRO 2, turning your laptop into a DJ rig.
The all-in-one DJ systems TRAKTOR KONTROL S4 and S2 are also compatible with the now-free iOS app.
Updated to version 1.2.1 earlier today, Traktor DJ version 1.2.1 includes some well-deserved bug fixes.