FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.

Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.

SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).

AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹

Cubasis - Cubasis is Steinberg’s streamlined, multitouch sequencer for the iPad.

FL Studio Mobile - Create & save multi-track music projects on a smartphone