iOS Musician Apps (54) Instrument Sounds is Keyboards, Free

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

A Simple Ad-Free Piano-like Musical Keyboard. Easy to Play, Good Response and Small Application Size. Just Play the Instrument. The app doesn't use sampled real sounds but use FM synthesis. It sounds like piano though it's false.

Syntorial is a synthesizer training app, that will teach you how to program synth patches by ear.

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

Made for complex and organic sounds, Factory sports a big modulation matrix with all kinds of features to create a wildlife of sounds. A vast array of DSP is ready to play: Analog style oscillators and filters, but also different flavors of wavetable synthesis, Wavetable driven Waveguide resonators and a 3-FX-Chain in a dynamic signal flow.

Aparillo is an advanced 16 voice FM synth tailored for complex sound structures , majestic motions, moving and evolving soundscapes and atmospheres that are perfect for film, TV or games.

iPhilicorda is an emulation of a vintage organ from the sixties, the Philicorda, created by the Dutch company Philips.

SynthMaster One iPhone is KV331 Audio's first full blown synth app for iPhone. It's a powerful wavetable synth with an intuitive workflow. With its simple layout, rich wavetable/waveform content and inspiring factory presets library, designing new sounds with SynthMaster One iPhone is a joy.

Spectrum is a collection of Audio Unit ports of popular eurorack synthesizer modules.

ToyTone is simple synthesizer. Select waveform, and move the slider. Tap the pad at bottom, you can play.

Mynth is the new intuitive and powerful synthesizer by Fingerlab.

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

MonoStereo Synthesizer is a free full-featured analog mono synth with oscillator panning.

Endlesss is a free-to-use collaborative music studio with built in drums, synths, fx and much more. Easy to get started for the novice electronic musician with boundless opportunities for the seasoned creative.

expressionPad is a new kind of musical instrument. Continuous multi-touch support means you can control pitch bend, dynamics, and modulation with each touch, even as you change notes.

Beatonal is an accessible music making app, enabling you to easily create and share your musical ideas using the built-in synthesizers and drum machine.

iTuttle is a Subtractive Monophonic/Paraphonic Synthesizer.

Scythe is a new iPad synthesizer that makes designing new sounds easier than ever before.

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

DRC is a virtual analog polyphonic synthesizer that recreates the characteristic sound of an analog synthesizer.