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

GarageBand is a DAW by Apple.

mood is a personal interpretation of the legendary Analog Synthesizer by Eugenio Giordani

Multilevel Interactive Sound Synthesizer. Up to 240 Frequency Modulation Oscillators or simple Wavetable Additive.

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.

Zillidrone is a sample-based groovebox for creating, performing and interacting with 32-step sequences for snares, kicks, hi-hats, sampler and two multioscillator synthesizers.

Moebius Lab is a multimorphic sound processor which contains a synth, a varispeed stereo sample player, effects and LFOs that can modulate each parameter.

Phawuo is a monophonic virtual-analog synth with "dirty" oscillators. Good for bass sound and effects.

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

PixiTracker 1BIT is a simple and fun tool to quickly create musical sketches, chiptunes and experiments with TRUE 1-BIT SOUND (like on old microcomputers).
No musical knowledge required.

PixelWave is an experimental synth with old school pixel interface.

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

SpectrumGen is a spectral synthesizer with a simple and effective user interface.