iOS Musician Apps (333) Supported Technologies is Audio Unit (AU), Type is Effect

AudioTune is a new real-time pitch correction AUv3 plugin from Coda Labs and AudioKit. Make vocals and instruments sound more in tune, or add creative robotic tuning effects in real-time with nearly zero latency.

Atomizer is a great plugin for adding beat synced glitch and stuttering, pitch shifting and various forms of filtering effects to your songs.

Alien Box is LFO operated modulation effect.

TalkWorks is an AUv3 plugin designed to give any sound a human vocal like quality by simulating vowel sounds found in human speech.

Resonator Audio Unit is an audio effect that creates natural sounding resonances in an acoustic body.

This is an AUv3 compatible audio expander which can be used as a plugin with your favourite DAW such as Cubasis, Meteor, Auria or GarageBand. It supports a graphical interface and presets with stereo metering to monitor signal levels.

ToneBoosters Barricade is a peak limiter and compressor.

Dual VCF adds motion, shape, and colour. It produces evolving rhythmic movement and complex dynamic filter shapes.

ToneBoosters Enhancer is an enhancer, exciter and sweetener plug-in.

BitJuggler is an audio plugin to simulate vintage digital processing and to recreate digital imperfections.

ToneBoosters Equalizer is a dynamic equalizer plug-in.

ToneBoosters Reverb is a studio-quality reverberation plug-in.

This is a natural sounding reverb audio effect.

Koala FX is the creative effects unit. It offers 16 one-touch effects that you can play intuitively like an instrument, allowing you to morph and twist your track.

Dub Delay emulates an analog tape delay unit with various options to filter and saturate the output signal before it is fed back into the delay unit.

Visual Reverb is a plate reverb with multi-band EQ and the ability to analyse audio in real time giving a spectrum representation of your signal flow.

Visual EQ Console is a multi-band EQ console with the ability to analyse audio in real time giving a spectrum representation of the frequency response. 

DerVoco is a vintage vocoder emulation. DerVoco uses analog modelled components including filters, envelope followers and companders to create a warm vintage sound instead of digital techniques like FFT.

This one is quite experimental and CPU heavy app!

From subtle tube-style saturation to full-on mangled wavetable distortion, Grind is a Swiss Army Knife of sound design.