AudioKit Synth One Synthesizer: The World’s Most Powerful Open-Source Instrument.

Professional-grade sound design in your hands. Join over 1 million creators using the award-winning, completely free synth trusted by the designers for M83, Tycho, and Rihanna.

Music & Audio ›

Publisher

AudioKit Pro, LLC

Sonic Mastery Visualized

Discover the interface used by 1M+ users.

AudioKit Synth One synthesizer interface with vintage analog controls and virtual keyboard

AudioKit Synth One app interface featuring dual XY pads for LFO and filter control above a digital piano keyboard

User interface of AudioKit Synth One featuring a 16-step sequencer and a piano keyboard on an iPad screen

Advanced harmonic tuning interface in AudioKit Synth One with a visual scale diagram and piano keyboard.

Interface of AudioKit Synth One showing filter and amplitude envelope controls with a virtual keyboard

Professional Power, Community Heart

The tools that make this app stand out, trusted by 1M+ users.

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Industry-Leading Sound Library

Dive into 300+ presets created by the legendary sound designers behind M83, Rihanna, and Tycho to jumpstart your next hit.

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Truly Free & Open Source

Break free from subscription fatigue with a professional-grade synth that has zero ads, no IAPs, and total transparency.

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Studio-Ready Integration

Transform your iPad into a workstation with full MIDI support, Ableton Link synchronization, and Audiobus compatibility.

Loved by users worldwide

Trusted by 1M+ people who love this app.

"As a producer working out of a small apartment in Brooklyn, Synth One has been a total game-changer. The fact that I can get sounds used by artists like Tycho and M83 for free on my iPad is mind-blowing. It integrates perfectly with my MIDI controller and has become a staple in my workflow. Truly the best synth on the App Store."

Marcus J., Electronic Producer

"I've tried dozens of iOS synths, but nothing matches the soul and community spirit of AudioKit Synth One. It's powerful, intuitive, and the vintage-inspired filters sound incredible. Knowing it’s open-source and built by volunteers makes it even better. No ads, no subscriptions—just pure, high-quality synthesis."

Elena Rodriguez, Sound Designer

About the app

Everything you need to know about AudioKit Synth One Synthesizer.

Description

“A big step forward for mobile music” - CDM (Create Digital Music) "Groundbreaking iOS synth app" - Cult of Mac "Must-download for every iPad owner" - MacBreak *** "2018 App of the Year, Runner up" – Stuff.tv *** *** “Best iOS Music Apps of 2018” – Cult of Mac *** *** “Best of 2018: iOS Apps for Musicians” – Ask.Audio *** "AudioKit Synth One is a free feature-packed synth for your iPad, including 300+ presets created by professional sound designers behind M83, Tycho, and Rihanna" - Engadget *** “Best Music Apps of 2018” – Music Radar *** LEARN OUR INCREDIBLE STORY: Audiokitpro.com/synth *** Optimized for newer iPads & iPhones for best performance. Note: Requires iPhone 6 or higher screen size. App will not work on older iPhone 5/SE/Touch devices "A Stunning Endeavor... Sounds Amazing!" - Francis Preve, Electronic Musician Magazine “Amazing & Brilliant… Sounds fantastic!” – The Sound Test Room "A great example of human endeavor" - Gaz Williams, Sonic State "Sounds amazing... the start of something huge." - Ask.Audio AudioKit Synth One is the first completely free & open-source professional iOS Synthesizer app in history. No Ads. No IAP. It will always be free. "Powerful... Awesome" - Synthtopia.com "An amazing synth app for your iPad that’s as close to sorcery as it gets" - GarageBand Guide "Must Have iOS Synthesizer" - Synth Anatomy "Synth One is a robust piece of free software" - The Verge "It WOWS you... immediately fun to start tweaking!" - discchord "A damn fine synth" - Computer Music Magazine "Open-source and seriously powerful" - Future Music Magazine "A labour of love that everyone can enjoy" - Music Radar "Extremely exciting passion project" - Music Tech Magazine "Make your own imposing synthesizer sounds and teach yourself the basics of music production" - Lifehacker Learn more: audiokitpro.com/synth Created by over 100+ volunteers around the world (including sound designers for M83, Rihanna, Kanye West, Neon Trees, Mike Posner, Tycho, and more), this app includes MIDI support (play it with a MIDI keyboard or controller), sequencer, vintage-inspired analog filters, expressive arpeggiators, warm analog delays, and, over 300+ presets to get you started! Email us your music & bugs: hello@audiokitpro.com SYNTH ONE FEATURES: This synthesizer is completely free, fully functional, and ad-free. There are no IAP or anything to buy -- It’s the ultimate free iPad music instrument app! • Hybrid Analog/FM Poly Synthesizer • Over 300+ Presets crafted by famous sound designers • Audiobus 3 & Inter-app Audio (IAA) • Ableton Link • Five Oscillators (2 DCO, FM, Sub, Noise) • 2 LFOs with over a dozen routing possibilities • Vintage-Style 16-Step Sequencer • Classic poly arpeggiator • MIDI in (Control with a MIDI Keyboard or AudioBus/IAA) • Touchable ADSR Envelopes for Amp & Filter • FM Oscillator w/ Mod • Mono glide and legato • Dedicated Sine/Square -12/24 Sub Osc • 4-Pole Vintage Low-Pass Filter • High-Pass/Band Pass Filters • Beautiful Costello Reverb • Multi-tap (ping-pong) delay • TouchPads • Preset & Bank Import/Export & More… BONUS: Full Source code is now available! AudiokitPro.com/Synth Plus, it’s completely open-source. Use the code to learn how to build your own synth app or modify the app yourself! OFFICIAL VIDEO: https://youtu.be/hwDNgCYowYs "Amazing noises that will make your ears squee with glee" - Stuff Magazine "Pick of the Week" - MacBreak On the roadmap: • MPE Support (Play w/ a Roli Seaboard) • AUv3 Plug-in support

Latest Version

1.9.1

Size

33.3 MB

First Released

Jul 7, 2018

Pro Sound. Zero Compromise. Always Free.

Join over 1 million creators and experience the world's premier open-source synthesizer. No ads, no subscriptions, no catch—just the power of professional sound design in your pocket.

FAQ

Frequently Asked Questions

Everything you need to know about AudioKit Synth One Synthesizer

Is AudioKit Synth One a free application?

Yes, AudioKit Synth One is completely free. It is a professional iOS Synthesizer app with no ads, no in-app purchases, and it will always remain free for users.

What devices are compatible with AudioKit Synth One?

AudioKit Synth One is optimized for newer iPads and iPhones, requiring an iPhone 6 or higher screen size. It does not function on older iPhone 5, SE, or Touch devices.

What types of synthesis does AudioKit Synth One offer?

AudioKit Synth One supports Hybrid Analog/FM Poly synthesis. It includes five distinct oscillators: two DCOs, one FM, one Sub, and one Noise oscillator for comprehensive sound design.

Does AudioKit Synth One have a built-in sequencer?

Yes, AudioKit Synth One includes a vintage-style 16-step sequencer. This feature allows users to create and edit musical sequences directly within the app's interface for dynamic sound arrangements.

Can AudioKit Synth One be controlled by external MIDI devices?

Yes, AudioKit Synth One offers full MIDI in support. Users can control the app with a MIDI keyboard or other MIDI controllers, and it also integrates with AudioBus/IAA for expanded connectivity.

Are there any in-app purchases in AudioKit Synth One?

No, AudioKit Synth One does not feature any in-app purchases (IAP). The application is fully functional and completely free, with no additional costs or hidden transactions for its features.

How many presets are included in AudioKit Synth One?

AudioKit Synth One includes over 300 professionally crafted presets. These presets are designed by acclaimed sound designers, providing users with a wide range of ready-to-use sounds.

Is AudioKit Synth One open-source?

Yes, the full source code for AudioKit Synth One is available and completely open-source. This allows users to learn, build, or modify their own synth apps using the provided code.

Does AudioKit Synth One support Ableton Link?

Yes, AudioKit Synth One supports Ableton Link. This functionality enables users to synchronize the app's tempo and timing with other Link-enabled applications and hardware for seamless performance.

Does AudioKit Synth One feature ADSR envelopes for sound shaping?

Yes, AudioKit Synth One features touchable ADSR envelopes. These are available for both the amplifier and filter sections, providing precise control over the sound's attack, decay, sustain, and release.

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