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The music theory reference tool for musicians of all skill levels. Tonality allows you to view and listen to a large database of piano chords and scales and features a chord-recognition tool that can identify chords you play on your instrument.

New version 4.1
Old version 4.0.1
Release Notes Major improvements to Chord ID tab (in addition to it actually functioning again... sorry about that): - Completely reworked chord-detection algorithm - Added tuning forgiveness (for out-of-tune instruments) and overtone rejection Library expansion: - Added many new extended chords to the default library
Author Bryce Hostetler
Type Tool
Supports Audio Unit (AU)

HOWL is a simple vocoder/synthesizer. It uses formants to simulate the human voice and a pitch-space keyboard to help you find interesting melodies.

New version 2.3
Old version 2.2
Release Notes Fixed Audiobus support
Author Daniel Clelland
Type Instrument, Effect
Instrument type Synth
Instrument sounds Keyboards
Effect type Vocoder
Supports Audiobus

Tardigrain is a granular synthesizer. Sounds are created by taking smaller fragments of a sample and playing them back in a non linear fashion, with settings for grain size, direction, step size and more.

New version 1.0.17
Old version 1.0.16
Release Notes +++ Improving the situation with loading IAA in iOS 12.4. A complete fix is down to what Apple does now. Will they kill off or will they give a soon deprecated protocol a chance, I don't know.
Author Erik Sigth
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus, Audio Unit (AU)

Stage Traxx is an audio player designed for professional musicians working with backing tracks. With Stage Traxx 3, controlling your live performance will be easier than ever before.

Author Peter Dikant
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Audiobus

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.

New price $5.99
Old price $7.99
Author 4Pockets.com
Type Effect
Effect type Reverb, Delay, Echo
Supports Audio Unit (AU)

SoundScaper is an experimental sound mini lab for creating unusual soundscapes, atmospheric textures, drones, glitches and noises based on circuit bending principles.

New version 1.9.7
Old version 1.9.6
Release Notes - Access SoundScaper files through Files app. - When app going to background UI not reset. - Fixed problem with exporting files from another app to SoundScaper. - Fixed crash when use Dropbox service.
Author Igor Vasiliev
Type Instrument
Instrument type Sampler, Synth
Instrument sounds Other
Supports Inter-App Audio (IAA), Audiobus

The music theory reference tool for musicians of all skill levels. Tonality allows you to view and listen to a large database of piano chords and scales and features a chord-recognition tool that can identify chords you play on your instrument.

New price $4.99
Old price $5.99
Author Bryce Hostetler
Type Tool
Supports Audio Unit (AU)

Auto-Tune Mobile brings vocal pitch correction to vocal performance, using Antares' world-class Auto-Tune® technology.

New version 4.4
Old version 4.3
Release Notes This release saves and restores the last button settings when using the Audio Units (auv3) version of Auto-Tune Mobile.
Author Antares Audio Technologies, LLC
Type Effect
Effect type Vocal effects
Supports Inter-App Audio (IAA), Audiobus

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

New version 2.2.4
Old version 2.2.3
Release Notes - Fixes sample rate issue on AUv3
Author Imaginando Lda
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus, Ableton Link

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.

New price $12.99
Old price $24.99
Author Phil Atkin
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus

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

New price $5.99
Old price $9.99
Author Phil Atkin
Type Instrument
Instrument type Sampler
Instrument sounds All-in-one
Supports Inter-App Audio (IAA), Audiobus

Visual Compressor is a 4 band compressor/expander which has the ability to analyse audio in real time giving an accurate and reliable spectrum representation of your signal as well as visual feedback of compression or expansion levels.  It's uses range from final mastering of songs to dynamic manipulation and EQing of drum tracks.

New price $5.99
Old price $7.99
Author 4Pockets.com
Type Effect
Effect type Compressor, Limiter, Gate
Supports Audio Unit (AU)

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

New version 1.0.2
Old version 1.0.1
Release Notes - New spectrum analyzer mode showing direct and reverb spectrum simultaneously - Various usability and stability improvements
Author ToneBoosters
Type Effect
Effect type Reverb, Delay, Echo
Supports Inter-App Audio (IAA), Audio Unit (AU)

Klimper is a mobile music creation studio with inspiring music theory features that helps you create and develop ideas while making complex songwriting tasks easy.

New price $3.99
Old price $8.99
Author POLYDIGM Software UG (haftungsbeschraenkt)
Type Host
Supports Inter-App Audio (IAA), Audio Unit (AU)

Make Louder is not based on complex dynamics processors and it is also not an overdrive or amplification or saturation effect. We created a special digital algorithm that can boost audio in loudness up to a certain limit, without colorizing the sound too much. And it can prevent the audio to exceed the output limits if you for instance stack together many sound sources.

Author Jens Guell
Type Effect
Effect type Compressor, Limiter, Gate, Other
Supports Audio Unit (AU)

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.

New price $4.99
Old price $6.99
Author 4Pockets.com
Type Effect
Effect type Reverb, Delay, Echo, Pitch effects
Supports Audio Unit (AU)

Synthesizer specially designed for creating and experiments with ambient soundscapes in wide range from noises to melodic instruments and everything in between.

New version 1.7.9
Old version 1.7.8
Release Notes - Fixed crash at startup when app has a lot of downloaded samples. - When going to background UI not reset. Version 1.7.8 - Fixed bug with IAA in iOS 12.4. - Panels close when clicked outside. - Audiobus SDK 3.0.7 updated.
Author Igor Vasiliev
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus

HOWL is a simple vocoder/synthesizer. It uses formants to simulate the human voice and a pitch-space keyboard to help you find interesting melodies.

New price Free
Old price $1.99
Author Daniel Clelland
Type Instrument, Effect
Instrument type Synth
Instrument sounds Keyboards
Effect type Vocoder
Supports Audiobus

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.

New price $5.99
Old price $7.99
Author 4Pockets.com
Type Effect
Effect type Reverb, Delay, Echo
Supports Audio Unit (AU)

GuZheng is a Chinese plucked zither that has a history dated back to 500 B.C. It is rich in playing techniques.

New version 6.0
Old version 5.1
Release Notes 1.Follow-Play songs for learning Guzheng. 2.New UI. 3.Bug fixes.
Author Supertintin Co., Ltd
Type Instrument
Instrument type Sampler
Instrument sounds Strings, Ethnic
Supports Inter-App Audio (IAA), Audiobus