iOS Musician Apps (50) Instrument Sounds is Keyboards, Free

Dedicated monophonic synth bass synthesizer.

Turbosounds for Accordion provides many special sounds of the Oberkrainer folk music.

Featuring an FM tone generator, FM Essential is a synthesizer app that provides for real-time synth performances and also lets you edit voices.

Colossus Piano sets a new standard in terms of realism, detail and overall quality of piano sounds on your iPad, iPhone and iPod touch.

Each of the 2 oscillators offers a selection of 5 waveforms: sawtooth and pulse waves are here, along with noise, triple saw and triple FM waves. There's also an additional sub-oscillator strapped into the master section for added oomph.

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

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.

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

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

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

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

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

Primer is a synth equipped with the most essential controls and nothing more.

Fed up with standardized presets and instruments? Feel lost in overcomplex filters and effects? Don’t wanna sound like everyone else? BLEASS is just the right instrument for you: it unleashes your inner musical creativity by bringing music production and performance to its very core: play, perform, compose beats and melodies in a new yet intuitive way thanks to its multitrack sequencer, synthesizer and drum machine.

Mellowsound is an emulation of a legendary instrument, a keyboard sampler from the 60s used by many famous artists like the Beatles, David Bowie, Radiohead and many others, this mythic instrument is called The Mellotron.

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.

Triqtraq LE is a free limited edition of the critically acclaimed music app Triqtraq - Jam Sequencer.

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.

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.

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