Innovative apps for iOS and OS X
Secret Base Design is an independent software development group.
Infinite Looper
MIDI Looping for iOS
Stompwatch MIDI Pedal Board
Control synths, sequencers, and effects apps
FCBFF
For the Behringer FCB1010. It's your best friend forever.
Rapid Tab
Convert live guitar playing to MIDI and tabs
Rapid Tab
Fast Pitch-to-MIDI
Infinite Looper
A versatile iOS MIDI looper and song arranger, with built-in SoundFonts, IAA hosting, Ableton Link, and Audiobus. More info 
Sidecar
Sidecar is designed for the iOS 9 iPad "slide over" and "side-by-side" mode. It gives you a handy and configurable set of MIDI pads.
FCBFF
If you have a Behringer FCB1010, you need FCBFF, your Foot Controller's Best Friend Forever. The app will program the FCB, and can emulate it too. If you use Apollo MIDI over Bluetooth, you can even make your FCB1010 wireless!