iOS Musician Apps (132) Supported Technologies is Inter-App Audio (IAA), Instrument Type is Synth

Vox Unit is a vocoder. You speak in the microphone, you play on the keyboard, and choir and vocal effects are produced.

Dazibao is a polyphonic synthesizer programmed by an innovative interface : you create several tones, then you arrange them on several time lines.

Arctic Pro Synthesizer / Vocoder is a modern subtractive synthesizer.

Phase84 is a phase distortion synthesizer.

Tardigrain is a granular synthesizer. Sounds are created by taking smaller fragments of a sample and playing them back in a non linear fashion, with settings for grain size, direction, step size and more.

Syntronik is IK’s cutting-edge synthesizer that features the sound of the most iconic machines to ever grace the planet.

Pixound provides a deep musical experience that lets you instantly create music using any picture.

Shape is a polyphonic synthesiser allowing the user to draw the shape of the oscillator waveform.

SKIIID is a new drum-synthesizer with 4 expressive pads and the possibility to morph between them.

A matrix-controlled arpeggiator designed to play with your thumbs.

Esoteric Synth is a unusual generator of synthetic sound events. The synthesis is based on 5 oscillators which are intersected through an multiple amplitude modulation and multiple frequency modulation making  an high sound variability. This App is suitable to generate complex sound textures, glitches, noises, sound clouds, sound drones, point sounds and more.

iMini is a recreation of the legendary synthesizer created by Bob Moog in 1971, one of most iconic synthesizers of all time.

When a punchy, fat sound is demanded, look no further. iProphet recreates the unique sound of the classic Sequential Circuits Prophet VS synthesizer.

SidTracker64 is the ultimate chiptune production package tool for the iPad. It emulates the SID sound chip from the dominating home computer of the 80s - The Commodore 64.

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

S-Modular is a semi modular synthesizer for your iPad.

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

Explore unreal synthesis with the most unique performance control on iOS! TC-Performer presents a multi-touch performance environment unlike any other synthesizer.

iSEM is a recreation of the classic 1974 Oberheim SEM (Synthesizer Expander Module), one of the world's first self-contained synthesizer modules and the first to bear the "Oberheim Electronics" name.