iPad Screenshots


“A big step forward for mobile music” - CDM (Create Digital Music)
"Groundbreaking iOS synth app" - Cult of Mac

*** App of the Week - Stuff.tv ***
*** Free App of the Week - TechRadar ***
*** Best Free iPad Synth - EM Magazine ***

"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

"A great example of human endeavor"
- Gaz Williams, Sonic State

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.

"This is a Must-download for every iPad owner."
- MacBreak

"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
"It WOWS you... immediately fun to start tweaking!" - discchord
"Amazing & Brilliant Synth... Sounds fantastic!" - The Sound Test Room
"A labour of love that everyone can enjoy" - Music Radar
"Amazing noises that will make your ears squee with glee" - Stuff Magazine

"A Stunning Endeavor... Sounds Amazing!"
- Francis Preve, Electronic Musician Magazine

VIDEO: https://youtu.be/hwDNgCYowYs

Created by over 100+ volunteers around the world (including sound designers for M83, Rihanna, Kanye West, 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

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 will be released soon...

Plus, it’s completely open-source. Use the code to learn how to build your own synth app or modify the app yourself!

"Pick of the Week" - MacBreak

On the roadmap:
• MPE Support (Play w/ a Roli Seaboard)
• AUv3 Plug-in support

What's New

Version 0.8.8

We are so grateful for your support. You're awesome! Your kind words motivate us. :)
+ Ableton Link integration started! In this update, the app will change tempo with other Link enabled apps. This is useful for hosts like AUM, Audiobus, Beatmaker 3, etc. Press the "Link" button above the keyboard to turn it on.
Thanks to Aure, Jeff Cooper, and Marcus Hobbs for helping to make this happen.
+ New icon contributed by Clayton Miller
+ Misc small fixes

We are all volunteering our time to build this app for you. No one gets paid anything.
Please spread the word. The more musicians that know about this app, the more musicians we can all reach!
Please send bug reports: hello@audiokitpro.com

Thank you :)

Ratings and Reviews

4.9 out of 5

1.1K Ratings

1.1K Ratings

Editors’ Notes

Fully functional and fun synthesizer with oscillators, sequencers and 300+ presets.

Absolutely phenomenal


This synth sounds amazing, looks amazing, has more features than you would expect, and it’s free!! This quickly became a favorite synth of mine; I’m more pleased with it than apps I’ve paid $20+ for. I’m running it on an Air 1 and haven’t run into any performance problems with this.

Some features I really dig are the oscilloscope, the tuning controls, and the effects. It’s cool being able to see your sounds in real-time and not many synths—hardware or software—have that feature. The tuning page is really inspiring because you can get some nice variations while using the sequencer. And the effects sound absolutely beautiful. I also enjoy the ability to scroll through the different pages while playing the onscreen keyboard.

That’s not where the awesomeness of this app ends though. I cannot speak highly enough of what Matt and the rest of the team have pulled off here. To me, the greatness of a synthesizer is judged by how immersive the playing experience is, and Synth One delivers. You can quickly get lost in playing this because it is just that good. If you have an iPad, you need this app.

Feature request


Hats off to the dev and audio team behind this amazing app. This is truly a well put together app and I can tell a lot of thought was put into this. Also, thanks for making it free!! Now to my feature request. Obviously I could hook this up to a usb/midi keyboard, but what would be really cool for those times I’m on the go is if the keys would map to the Apple Smart Keyboard. That would be amazing. The touch screen works flawlessly, but for that added accuracy of having a button to press this would take the portability to the next level. That is all. Thanks for creating such an awesome app!

Developer Response

Cool idea about the smart keyboard, though I am not sure Apple gives us access to when the keys are pressed and released. I did a little research and came up almost empty. Apparently a game called Octagon allows you to use the keyboard. I'll dig around. -Aure


AudioKit Pro, LLC
45.6 MB
Requires iOS 10.3 or later. Compatible with iPad.
Age Rating
Rated 4+
© Built with AudioKit


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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