iOS Musician Apps (288) Supported Technologies is Audio Unit (AU), Type is Effect

This is actually a trio of effects all rolled into a single package which are ideally suited but not limited to voice recordings (De-Esser, a Vocal Doubler and a Noise Gate).

K7D is a vintage tape delay effect plugin for iOS.

GyroVibe evokes the sound and textures of a classic vibrato chorus. It also contains multi-stage driven filters that will swirl and swoosh your instrument all over the stereo field. GyroVibe is perfect for adding depth and color to keyboards.

ChannelStrip is, as its name implies, a channel strip app and AUv3 plugin. With a gate, equalizer, and compressor, ChannelStrip can provide a solid and easy-to-use channel control for your iOS mixing needs.

Stellr is a pitch-shifter/delay/reverb sound processor aimed to recreate the classic shimmer effect.

FAC Bandit is a multiband audio effect that splits the audio signal into three bands of frequencies defined by adjustable crossover points.

This is an audio unit plugin that puts a small delay between the left and right channels.

The BLEASS reverb is a reverb plugin.

Harmonic Exciter is an AUv3 Compatible plugin for your favourite DAW such as Cubasis, Auria, AUM, Meteor, BM3 or GarageBand etc.

STARK is a fully fledged amplifier simulator consisting of four modules: Amplifier, Cabinet, Room and effects slots. These modules are processing audio separately, which makes it possible to combine different amplifiers with different cabinets and rooms.

BLEASS delay transforms your sounds into cinematic and experimental sonic experiences! It is constantly creating flux in the audio signal making your music even more lively.
BLEASS delay is also ideal for making track build-ups and transitions.

This shimmer effect is a combination of effects that creates an etherial wall of sound. The effect combines a digital delay and pitch shifter to create multiple harmonies before entering a rich long reverb with controllable filtering. The resulting effect is a monsterously huge sound adding a spacious atmospheric quality to any lead instrument or vocal.

The WoodLofier is both a standalone app and AUv3 plugin which combines 4 different sections to make your sound more lofi or to add some creative twist  : filtering (and Sample Rate reduction), a Tape wobble unit, Noise addition and Crushing (clipping, bit reduction and saturation).

CuSnP is a sympathetic string simulation. Input audio excites the strings and causes them to resonate much like the open strings on a piano will resonate when some other sound source excites them.

LRC5 is a five-band EQ. It includes low shelf, high shelf, and three parametric peak/cut filters.

Some of the most commonly used MIDI manipulations in one handy package. This is MidiFire's Channel Strip module in AUv3 format.

mfxConvert is a plugin for converting MIDI events in real time. It can be used for simple channel, note or controller remaps. However, it can also handle sophisticated conversions of event types, for example pitch bend to controller or note velocity to channel pressure.

This is a natural sounding reverb audio effect.

RM-1 is a multi purpose audio effect designed around various types of modulation.

FilterMorph plugin takes the concept of a traditional audio filter and pairs it with overdrive, bit crunching and tape delay to perform some incredibly neat real-time or beat synced automation effects.