iOS Musician Apps (125) Supported Technologies is Inter-App Audio (IAA), Instrument Type is Synth

Xynthesizr is a streamlined yet capable 32-step matrix sequencer/monotimbral synthesizer with generative features and MIDI.

Continua is a three-oscillator / dual-filter six-voice virtual analog synth, with fully polyphonic modulation sources and built-in custom-designed effects, for everything from complex, evolving chill-out soundscapes to New Wave synth stabs.

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.

The ELECTRIBE reborn in an even smaller form A full-fledged rhythm machine for iPhone.

Mersenne is a melodic percussion synthesizer that combines two FM synthesis modules, a noise generator and a resonator.

Thanks to it's true VA synthesis engine, the use of analog-modelled non-linear filters and extensive modulation options, Flowtones sounds warmer and more analog than digital romplers and wavetable-based synths.

Lagrange synthesizer has two oscillators, a noise generator and two filters that can be selected from various algorithmic models.

Redshrike is a polyphonic synthesizer that combines a resonator designed to make more complicated sound creation and subtraction synthesis with an FM oscillator that creates violent distortion.

Lorentz is not only a live-oriented analog modeling synthesizer, but also has a resonator that makes metallic and aggressive sounds.

Laplace is a physical-modeling synthesizer based on resonator synthesis that makes it easy to create bowed string, plucked string, blown pipe and metallic sounds.

Pure Synth® Platinum is a full-blown rompler/synthesizer for your iOS device. Neither the synth engine or the sample engine is an afterthought: Both engines are fully capable and feature-rich. The romper section contains a well rounded assortment of analog, synth, string, digital, and acoustic instruments.

GarageBand is a DAW by Apple.

This synthesizer emulates male voice vowels in a unique way.

Baervaag brings FM synthesis to the masses! An easy to use but still tweakable synthesizer, accessible to everyone.

Tines emulates an electric piano.

Syndt is a polyphonic synthesizer with a lot of possibilities.

Cyclop is a monophonic synthesizer. It does one thing very well: delivering cutting-edge digital madness at the low end of the frequency spectrum.

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.