The Akai APC40 or APC40 Ableton Live Clip Launching Controller is a USB MIDI controller by Akai produced in partnership with Ableton since 2009.
The APC40 mkII, introduced in 2014, is an update of the original Ableton Live grid controller.
[1][2] The APC40 can be classified as an 'button-grid-style step sequencer'.