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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.

New version 2.3.7
Old version 2.3.6
Release Notes - Fixed crash when user is not connected to Wi-Fi
Author MIDIculous LLC
Type Instrument
Instrument type Sampler, Synth
Instrument sounds Keyboards, All-in-one
Supports Inter-App Audio (IAA), Audio Unit (AU)

A port of Dexed, an FM Synthesizer.

New version 1.0.71
Old version 1.0.68
Release Notes Quick and dirty temporary fix for iPads, and any time the full width of the plugin fits on screen. In that condition zooming is not allowed. LOCK PARAMs and LOCK SCROLL also now work again. Panning/scrolling is done with two touches now, so is zooming. You can scroll the CART .syx file browser with one touch, but may need to pan with two touches to the top of the CARTs file viewer. Knobs and sliders move with one touch. If you didn't get the master collection of 640,000+ patches, delete the app off the home screen and download from the App Store again. Knobs and sliders move with one touch. Multi-touches more than two touches may cause problems, the zoom and pan algorithm isn’t perfect yet. If you missed out on some previous versions there is a loading screen that should not be force quitted.
Author George Rosar
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Audio Unit (AU)

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

New version 4.0.9.2
Old version 4.0.9.1
Release Notes Bug fixes and performance improvements. Tip: For +1/-1 BPM tempo, tap 'FINE' on the top left of the Tempo screen.
Author Ninebuzz Software LLC
Type Instrument, Tool
Instrument type Sampler
Instrument sounds Drums, Percussion
Supports Inter-App Audio (IAA)

Scythe is a synthesis engine. The controls have been minimised to allow a simple workflow with the same complex modulation that you might be used to.

New price $0.99
Old price $1.99
Author Sonic Sector Ltd
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus

Jasuto is the modular synthesizer for the iDevices.  

New version 1.8.1
Old version 1.8.0
Release Notes Fixed Aiff loading in scenes and browser.
Author Christopher Wolfe
Type Instrument, Effect
Instrument type Synth
Instrument sounds Keyboards
Effect type Reverb, Delay, Echo, Chorus, Flanger, Phaser etc.
Supports Audiobus

With a library of editable patterns, loops, and fills, Drum Session is a very fast, simple way to put together a complete drum track.

New version 1.2.13
Old version 1.2.12
Release Notes 1. Update iPhone X layout. 2. Fix setting menu UI.
Author Ngo Minh Ngoc
Type Instrument
Instrument type Sampler
Instrument sounds Drums, Percussion
Supports Inter-App Audio (IAA), Audiobus, Ableton Link

Slow down music, choose the perfect pitch, and learn to play by ear.

New version 4.3.2
Old version 4.3.1
Release Notes Stability improvements and bug fixes Improved importing consistency when using 'Copy-in Anytune' Fixed MIDI learn crash Fixed crash when changing EQ frequency in Band Stop filter Fixed crash when saving a preset with a predefined preset name
Author Anytune Inc.
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Inter-App Audio (IAA), Audiobus

K7D is a vintage tape delay effect plugin for iOS.

New price $0.99
Old price $5.99
Author Imaginando Lda
Type Effect
Effect type Reverb, Delay, Echo
Supports Audiobus, Audio Unit (AU)

Slow down music, choose the perfect pitch, and learn to play by ear.

New version 4.3.2
Old version 4.3.1
Release Notes Stability improvements and bug fixes Improved importing consistency when using 'Copy-in Anytune' Fixed MIDI learn crash Fixed crash when changing EQ frequency in Band Stop filter Fixed crash when saving a preset with a predefined preset name
Author Anytune Inc.
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Inter-App Audio (IAA), Audiobus

Real Guitar is a realistic guitar simulator apps.

New version 3.30.0
Old version 3.29.0
Release Notes We’re always updating our app because we want you to get the most out of it. That means fresh tracks, new instruments, awesome skins, and more! - Dive into your songbook Check out the latest hit songs we’ve added to your library. - Get your bugs fixed Performance and stability improvements are implemented. Don’t forget to report any bugs you come across - we’re constantly working hard to make improvements!
Author Gismart Limited
Type Instrument
Instrument type Sampler
Instrument sounds Guitar
Supports Inter-App Audio (IAA), Audiobus

djay transforms your iOS device into a full-featured DJ and music production system.

New version 3.1.10
Old version 3.1.9
Release Notes Thank you for using djay! We update the app regularly to provide the best mixing experience for you. Here is what’s new in this release: Version 3.1.10: • Updated user manual • Bug fixes and performance improvements Version 3.1.9: • Fixed launch screen logo offset on some devices • Improved CPU usage when using different hardware sample rates • Various bug fixes and performance improvements Version 3.1.8: • New: Added “All Songs” tab to media library for local files • New: Added 3rd FX to “Manual FX” view • New: History tab in library now allows you to browse through all previous sessions • New: Added user manual (accessible in settings panel) • Improved media library layout and interface for better readability • Improved VoiceOver accessibility for various elements • Improved performance with quick crossfader or slider movements when using MIDI controllers • Fixed cue point markers in overview waveform being offset on some devices • Fixed key lock button being difficult to activate in some view configurations • Various bug fixes and performance improvements NOTE: If you previously purchased djay 2 or djay Pro, you can continue to use them side-by-side with the new djay and re-download them at any time via the "Purchased" section in the App Store app. Additionally, all of your existing controller mappings, cue points, and purchased FX packs will automatically transfer to the Free and Pro versions of the new djay. If you enjoy using djay, would you mind taking a moment to write a review on the App Store? Your feedback is greatly appreciated.
Author algoriddim GmbH
Type Instrument
Instrument type Sampler
Instrument sounds DJ
Supports Ableton Link

At the heart of this compressor is a unique envelope follower design that makes it possible to compress the signal without creating distortion harmonics.

New version 1.0.3
Old version 1.0.2
Release Notes Bug fixes, stability improvements.
Author Mani Consulting Limited Company
Type Effect
Effect type Compressor, Limiter, Gate

With ChordPadX, chord are at your fingertips!  Trigger chords and notes intuitively, with a human touch.

New version 3.3
Old version 3.2
Release Notes Chord inversions are now supported for all existing chord types!
Author Mathieu Routhier
Type Tool
Supports Audiobus, Ableton Link

Castamatic is the app to listen to podcasts on any iOS device.

New version 5.0.1
Old version 5.0
Release Notes Version 5.0.1 - Minor improvements to onboarding page Version 5.0 - New modern UI - Favorite episodes - Italian localization - Improved Carplay stability Version 4.5.14 - Fix for crash while doing background updates Version 4.5.12 - Fix for rare crash when launched in the background Version 4.5.11 - Fix for CarPlay navigation voice interruption causing multiple repeated rewinds Version 4.5.10 - Fix for reporting wrong duration of last chapter Version 4.5.9 - CarPlay improvements - Open universal links in relative apps - Minor bug fixes Version 4.5.8 - Fixed dark theme color issues Version 4.5.7 - Expandable podcast descriptions - Minor bug fixes Version 4.5.6 - Improved episode descriptions - Minor bug fixes Version 4.5.5 - Fix for downloads playlist persisting after downloads are finished - Improved Siri shortcuts - Improved watch complications Version 4.5.4 - Improved complications for new watches - Improved transport UI - Improved iCloud sync speed Version 4.5.3 - Fix for Siri shortcuts bug Version 4.5.2 - Fixed: Castamatic did download artwork disregarding podcast settings - Current chapter's duration and remaining time in chapter list - Minor bug fixes Version 4.5.1 - Improved UI for new watch models - Added pause voice shortcut for Siri Version 4.5 - Support for Siri shortcuts - New watchOS player UI with volume control - Renewed player UI Version 4.0 - New Auto-leveler effect, with machine learning assisted voice/music detector and dynamic range optimizer. - Improved sync: both contents and sort order of the OnTheGo playlist are synced between devices and restored when app is reinstalled. - Improved UI better integrated with iOS 11 look and feel - Multiple item drag’n drop - Improved speed and stability - Improved dark theme - Improved podcast chapter support
Author Gunp Media Productions
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Audio Unit (AU)

With a library of editable patterns, loops, and fills, Drum Session is a very fast, simple way to put together a complete drum track.

New version 1.2.13
Old version 1.2.12
Release Notes 1. Update iPhone X layout. 2. Fix setting menu UI.
Author Ngo Minh Ngoc
Type Instrument
Instrument type Sampler
Instrument sounds Drums, Percussion
Supports Inter-App Audio (IAA), Audiobus, Ableton Link

Slow down music, choose the perfect pitch, and learn to play by ear.

New version 4.3.2
Old version 4.3.1
Release Notes Stability improvements and bug fixes Improved importing consistency when using 'Copy-in Anytune' Fixed MIDI learn crash Fixed crash when changing EQ frequency in Band Stop filter Fixed crash when saving a preset with a predefined preset name
Author Anytune Inc.
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Audiobus

AudioKit Synth One is a completely free & open-source professional iOS Synthesizer. 

New version 1.1.2
Old version 1.1.0
Release Notes Thanks everyone! We're always improving Synth One for you! Quick fixes: + Fixes Synth One from crashing on load on some iPhones + Ableton Link fixed yesterday In case you missed it – Version 1.1 Adds new keyboard! + NEW microtonal keyboard mode: Key colors match pitch wheel colors on "Tune" panel for intuitive performance + Marcus Hobbs has blessed you all with a microtonal keyboard that transports you to ultraharmonic dimesions Go to the "Keys" button above the keyboard, and choose the "microtonal" keyboard. + Tons of other fixes and improvements. Synth one is getting better every day! That's the power of open-source. Any help spreading the word about this app would be appreciated. The more people that know about the apps, the more musicians can enjoy them! Thank you! Share Once: Tell one musician you care about. That's all it takes. Together we can change the world. Please note that we all are volunteers. AudioKit does not have any sponsors or investors. We are all musician/developers who love making apps. We love hearing your music! Send it to us. For friendly conversation or to say hello, please email hello@audiokitpro.com The full & complete source code is available: https://github.com/AudioKit/AudioKitSynthOne
Author AudioKit Pro
Type Instrument
Instrument type Synth
Instrument sounds Keyboards
Supports Inter-App Audio (IAA), Audiobus, Audio Unit (AU), Ableton Link

Quincy is a unique music composition tool. Its modular approach to interpretation of cellular automata renders Life worlds in styles ranging from Balinese Gamelan music to that of Stockhausen.

New version 1.5.9
Old version 1.5.8
Release Notes • This version fixes a potential issue with Quincy's module loading.
Author RoGame Software
Type Host
Supports Inter-App Audio (IAA), Audiobus

OB-Xd is based on the Oberheim OB-X. It attempts to recreate its sound and behavior, but as the original was very limited in some important ways, a number of things were added or altered to the original design.

New version 1.0.6
Old version 1.0.5
Release Notes Fixed more-than-two-instances crash in Audio Units hosts. Enhanced retina voices and legato graphics. Reduced memory footprint. Added borders and better positions to popup windows.
Author DiscoDSP LLC
Type Instrument
Instrument type Synth
Instrument sounds Keyboards

Suggester is a tool to assist in the creation of songs and chord progressions.  This app will help you find chords that work together.

New version 7.4
Old version 7.3.2
Release Notes - Chord inversion is now possible for all existing chord types! - The Chord Catalog makes a smarter use of accidentals.
Author Mathieu Routhier
Type Tool
Supports Audiobus