iOS Musician Apps (26) Supported Technologies is Audio Unit (AU), Effect Type is Pitch effects

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

WoodScaper combines into one unit the 4 classic guitar effects : phaser, chorus/flanger, wah-wah and tremelo.

MicroPitch is a fine-resolution pitch shifter for subtle tone fattening, plus delays for interesting slap back effects.

Eventide Crystals Harmonizer® combines twin reverse pitch shifters with reverse delays and reverb. This iconic H3000 effect can be used to create out-of-this-world climbing and cascading pitched delays or to create unique sounding reverbs. It features two reverse granular delays that can be manipulated by length and pitch.

QVox is a creative audio effect that transforms vocals, guitars, drums, and synths into four independent voices. Create beautiful harmonies, widen instruments and design groovy rhythmic sequences with diatonic pitch shifting and delay.

JAX Unisonic is a special Audio Unit, able to produce up to 8 additional voices from any audio input.