With Audulus, you can build synthesizers, design new sounds, or process audio. All with low latency real-time processing suitable for live performance. Audulus's user interface is clean, simple, and easy to learn, allowing you to focus on sound - now made easier than ever with nearly 100 built-in Eurorack-style modules.

▶ Winner of Electronic Musician Magazine Editor's Choice Award, 2017

"Audulus 3 out and is stunning!" - Richard Devine,
"Anybody into synthesis should check out Audulus on the iPad. Tweaker heaven." - Jordan Rudess
"Audulus is fantastic, a thinking man's synth." - UK App Store review
Rated "Killer App" on!

Praise for the Mac version:
"beautiful interface" - Peter Kirn,
"Love this App. It has one of the best UIs I've ever used." - USA Mac App Store review
"The biggidy bomb coolest most super tech-nerd fun times soft synth I've bought in recent times!" - Mac App Store Australia review
"Remarkable gesture control" -

▶ Visit the Audulus Forum for exciting FREE user-created patches! ◀

▶ Educational pricing available. For more information, see

▶ Key Features:

• Fluid Vector Interface - smooth animated interaction
• MIDI control - use your control surface or MIDI keyboard
• Polyphony - process multiple voices
• Diverse Nodes - from ADSR to ZeroCross
• Patch Browser - quickly flip through your patches
• 32-bit floating-point signal processing
• Fully Enhanced for Retina Display
• Unlimited Undo - full history stored in a patch
• Round-trip workflow with Audulus for Mac
• Virtual MIDI – control Audulus from your favorite MIDI app
• Audiobus support! - Runs as both an Input and Effect
• Sub-Patches - group and reuse nodes
• Universal Modulation - modulate any knob
• iCloud support - effortlessly sync patches between Mac and iPad
• Custom Nodes - build your own modules!
• Timing mode - figure out which nodes are using the most CPU!

▶ Featured Built-in Modules:

• 5ms Revolving Clock Divider
• Touch Feedback Clock
• Ms. Torsion Distortion
• Fibonacci Sequence
• Fab Five Rectifying LFO
• The Warpeggiator
• Scale Quantizer
• Cyclone Matrix Mixer
...and many more!

▶ Built-in Nodes:

• Virtual Analog Oscillator (4 classic waveforms)
• ADSR Envelope
• Noise Generator
• Mathematical Modules: Addition, Multiplication, Subtraction, Sine, Modulo
• Math expression module - 34 operation expression language
• Random Number Generator
• MIDI controlled Keyboard
• MIDI assignable trigger
• 16-Step Sequencer
• Delay
• Distortion
• Low Pass Filter
• Low Pass Filter with resonance
• High Pass Filter
• Feedback Delay
• Unit Delay
• DC Blocker
• Envelope Follower
• Pitch Shifter
• Constant Value
• Gain
• Mapper Curve
• Piecewise-linear Spline Curve
• Sample and Hold
• Crossfade
• 4-Channel Mixer
• Level Meter
• Value Meter
• Scrolling Waveform Meter
• Light
• RGB Light
• Input/Output
• Polyphonic to Monophonic signal mixer
• Polyphonic/Monophonic signal converters
• Multiplexer/Demultiplexers
• Sub-Patch
• Timer
• Zero-crossing Counter
• Text

▶ Recommended hardware: 4th Generation iPad or later. iPhone 5 or later.

Please don't hesitate to contact us at support at audulus dot com if you have any questions or need help.

What's New

Version 3.5

A big update for 2018! Happy New Year!

- Audulus now requires iOS 11.2.
- We are using iOS 11's new document browser. So you can now organize your patches into folders, search, easily move patches to iCloud, etc.
- The Module Library is now organized in a hierarchy. You can search too!
- Patch metadata (tags, author, description) has been removed.
- You can drag & drop patches from the Files app.
- Select a node to highlight its connections.
- Instead of installing examples to your documents folder, you can now browse for examples when creating a new document.
- Larger example library. Including a preview of the new uModules, currently under development.
- Audulus now runs in portrait orientation on iPhone.

Ratings and Reviews

4.9 out of 5

44 Ratings

44 Ratings

Just Keeps Getting Better!


If you have every been interested in modular synthesis or electronic music creation, Audulus is the app for you. Far more than a “soft” synth, Audulus offers a rich visual programming environment for sound creation and manipulation. With a large selection of fundamental building blocks and a wide variety of prebuilt modules including example patches and full synths, Audulus allows you to create almost anything you can imagine. With multichannel IO support, MIDI, IAA and Audiobus compatibility, it can interoperate with other iOS music apps and with a suitable interface can also connect to more traditional hardware synthesizers. It’s available for iOS, macOS and Windows and patches can be shared between platforms. The 3.5 release features a new patch browser integrated with the iOS 11 Files app for simple patch management and sharing. The app has an active user forum where users can share ideas, patches, and assistance and there are several very good tutorials available on the forum to help get you started.

Developer Response

Thanks so much HammerDulcimer! Glad to see you're really getting the most out of Audulus - especially the forum :) We have so many great new updates coming along with 3.5, including lots of new patches that were developed first on the forum. Thanks again!

The best guitar FX app on IOS

Fidel Assthrow

I know this is geared toward modular synthesis, but you can build anything with this app. I have an old Maestro Echoplex tape delay that I'm always trying to replace with a more convenient pedal. All pedals out there are lacking in one degree or another but none of them replicate the distortion when you overload the input by leaning heavy on a volume pedal. Well, I was finally able to create that effect with Audulus. You can mix any sound to any other sound have it all controlled with a volume envelope. Distortions in Audulus sound as good as Bias FX and are far more flexible. All the basics are there to build any type of modulation, delay, reverb, way pedal, etc.

The only thing it's lacking for guitar is built-in guitar amp/cab modeling. I'm confident you CAN pull it off with Audulus if you know enough about how to get that sound. I use AUM to route Audulus to Bias amps and control it all with MidiDesigner. It's the best multi-FX unit I've had, completely customizable to my liking.

Fantastic learning tool and well-supported


I've had Audulus since early 2013 and it should be considered "Legendary" in the iOS synth world. Without a doubt, the best tool to learn and build synthesis engines. It certainly isn't your run-of-the-mill canned synthesizer (you must do a little work to make it go "beep"), but once you've learned some of the basics, the capability depth is unlimited. Audulus is well supported (check out the forum discussions, tutorials, and recorded live streams) and the developers and user-community are more than happy to answer any questions. You won't be disappointed.

Update (24 Jan 2018) - This latest update (V3.5) significantly improves the usability of the patch library taking advantage of the new iOS 11 Files browser.

Developer Response

Aw thank you so much BDB-1958! Glad you think so highly of us, and thank you for updating your review for 3.5 - pleased you're enjoying that as well. We're going to have some new patches coming your way soon - over 500! - in the next little iOS update. Stay tuned!


Audulus LLC
121.9 MB
Requires iOS 11.2 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, and iPod touch.
Age Rating
Rated 4+
© 2018 Audulus LLC


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