iOS Musician Apps (283) Supported Technologies is Inter-App Audio (IAA), Type is Instrument

Gestrument Pro takes everything we loved about Gestrument and improves on its original functionality while introducing a host of new features such as multi-touch, recordable automations, advanced scale editing and our unique system of highly tweakable modular generators that define the pitches and rhythms.

LCW-2 mono is a little complicated synthesizer based on ToyTone and implements several experimental functions.

AudioKit Synth One is a completely free & open-source professional iOS Synthesizer. 

You found it! Drum Beats+ is the metronome app that improves your timing using great sounding drum beats, not a boring click.

Modulin is a customizable synthesizer. It allows for unique personal expression while providing a wide spectrum of visual feedback.

Make and share music in seconds. Simply tap to RECORD, PLAY and SHARE with music makers all over the world.

Wotja X is a new cross-platform interface for the 'Wotja Generative Music System'.

Automatic song generation, flexible song editing.

Play along or record your own songs with the best studio drummer in the world.

Free iPad instrument featuring the classic sounds of famous 80s FM Synthesizers.

Built for Live performance and hands free use, Quantiloop recreates the simplicity of a hardware loop pedal in an iOS app.

Groovebox is a free music studio app packed with synths and drum machines.

LoAdKer is a novel rhythm event generator that is based on fractal sequences.

GarageBand is a DAW by Apple.

This is a Lite version of EGDR909 - 909 Drum Machine, but all its functionalities can be unlocked as in-app purchase.

AutoArp turns your iPhone (or iPod Touch) into a musical instrument that is halfway between a traditional auto-harp zither and an arpeggiated analogue-style synth.

SynthMaster Player for iPad is the MOBILE PLAYER VERSION of the award winning SynthMaster software synthesizer.

Echo Guitar™ Lite is a tool for composing guitar songs.

Nanologue boasts a wide scope of inspiring sounds and professional sound effects, sporting a straightforward multi-touch interface and a great-sounding monophonic synthesizer.