iOS Musician Apps (146) Supported Technologies is Inter-App Audio (IAA), Instrument Sounds is Keyboards

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

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.

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.

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

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

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.

With EGSY01 you can create sounds, from modern ones to vintage analog ones, working with arpeggiator, step sequencer and FM, addictive and subtractive synthesis .

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.

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

AutoArp turns your iPhone (or iPod Touch) into a musical instrument that is halfway between a traditional auto-harp zither and an arpeggiated analogue-style synth.

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

TF7 Synth is an FM synthesizer.

TF8 Synth is a professional virtual analog synthesiser that melds superior synthesis algorithms with iOS technologies.

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

iTuttle is a Subtractive Monophonic/Paraphonic Synthesizer.

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

"Piano 3D" is the piano learning & music discovery tool for the iPhone & iPad.

An attempt to rediscover the Accordion in a Middle Eastern context, this was the result with 6 presets and quarter note modulation.

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

Electric Piano HD is a professional instrument with samples layered according to note velocity.