DJ PADS turns your android device into a midi controller.
it is great for preforming and works in perfect synergy with an existing DJ controller. Its main purpose is to add some extra controls to your DJ deck.

It works best with Recordbox but can be mapped to work with any other DJ software like Serato DJ PRO, Virtual DJ, Traktor, Alberton Live and more...

Read more here: https://gilapps.com/djmidipads-support

Free/Pro version:
Free version: 2 Modes, 3 Effects (without knob controls)
Pro version: 12 Modes, 6 Effects including the knobs