iOS Musician Apps (280) Supported Technologies is Inter-App Audio (IAA), Type is Instrument

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.

SK-51 is an all-in-one keyboard inspired by the Casio SK-1 (and his brother the SK-5), a 8-bit lo-fi keyboard from the 80’s, with sampling features and onboard drum machine.
Called the poor man's sampler at the time, this keyboard was a real instrument and has been used by many major artists such as Fatboy Slim, Portishead, Autechre and Nine Inch Nails.

Brought to you in partnership with Streetly Electronics, the inventors of the mellotron, Streetlytron includes a massive collection of 90 tapes, with 65 drawn from Streetly's Production Masters - exactly the same tapes that ship with their $8,000 M4000 unit. Completing the sample sets are our own very popular 'Caitlin Downie Soprano' and 'Clare Lindley Violin' collection, to offer a huge, rich selection of choral and string textures for your mixes.

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

The Streetlytron '63 Edition : genuine Mellotronics for your iPhone and iPad.

The Beat Station is a rhythm machine for practicing guitar, bass, keyboard, or any type of instrument, and also brings to production and live performance the ease of not requiring live drums and a drummer.

Backpack Studio allows you to easily create professional sounding,  studio quality recordings -  from anywhere in the world.

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.

Epic 64-voice Virtual Analog / PCM iPad Synth. Inspired by the Digital Synths of the 80s and 90s.

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.

Gestrument Pro takes everything we loved about Gestrument and improves on its original functionality while introducing a host of new features such as multi-touch, recordable automations, advanced scale editing and our unique system of highly tweakable modular generators that define the pitches and rhythms.

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. 

You found it! Drum Beats+ is the metronome app that improves your timing using great sounding drum beats, not a boring click.

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

Make and share music in seconds. Simply tap to RECORD, PLAY and SHARE with music makers all over the world.

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

Automatic song generation, flexible song editing.

Play along or record your own songs with the best studio drummer in the world.

Free iPad instrument featuring the classic sounds of famous 80s FM Synthesizers.