# Audulus 4 — A Universe of Sound

> Modular synthesizer and sound design environment for audio creation. (iPhone/iPad app by Audulus LLC.)

- Source: https://appshunter.io/ios/app/audulus-4/id1592022030 (this page in markdown: same URL + `.md`)
- Developer: [Audulus LLC](https://appshunter.io/developer/452619536)
- Category: Music
- Price: Free with in-app purchases (on sale, was $19.99)
- Rating: 4.60/5 from 57 App Store ratings · 71 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 103 MB
- Languages: American English
- Released: 2022-12-12
- Data updated: 2026-08-15
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/audulus-4/id1592022030/reviews.md

## What is Audulus 4?

Build synthesizers. Design sounds. Shape audio in real time. All with professional-grade, low-latency performance ready for live use — and it’s free.

Audulus gives you a complete modular environment at no cost. Its clean, fluid interface stays out of the way so you can focus on what matters: exploring sound. A modular playground with room to grow — from first experiments to advanced designs.

Looking for more? Discover the Pro Module series: premium instruments and effects that show what’s possible when world-class sound design meets true modular freedom. Each Pro Module is crafted specifically for Audulus, giving you new ways to expand your sonic toolkit.

Available on iPhone, iPad, and Mac — your modular system travels with you.

▶ What People Are Saying:

"gem for Apple platforms – gorgeous, fluid" — Peter Kirn, createdigitalmusic.com
"stunning!" — Richard Devine, devinesound.net
"Remarkable gesture control" — sequencer.de

▶ Join our forum and Discord community!

▶ What You Get:

• Complete modular environment — free to download and explore
• Pro Module series — premium modules available as in-app purchases
• Available on iPhone, iPad, and Mac with iCloud sync
• Standalone app or AUv3 plugin
• Deep node library for building from scratch
• Extensive module library for synthesis and sound design
• Multi-channel signal flow for polyphony and complex routing
• Next-gen multi-core audio processing
• Smooth, high-performance graphics even with massive patches
• MIDI I/O with MIDI learn
• GLSL shader node for creating advanced visuals
• Lua scripting for custom DSP and vector graphics

Terms of Use: https://audulus.com/terms.html

## Key features

- Modular synthesizer environment
- Sound design tools
- Real-time audio shaping
- Extensive module library
- Premium Pro Modules (in-app purchases)
- Cross-device iCloud sync
- AUv3 plugin support

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Audulus Pro (1 Year) | $29.99 | per year |
| Audulus Pro (1 Month) | $4.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Patch Editing | $29.99 | one-time |
| CLK SS-516 | $7.99 | one-time |
| TRIKOR VCO | $9.99 | one-time |
| J-23 Reverb | $7.99 | one-time |
| CLK Clock Generator | $4.99 | one-time |
| MetaEnvelope | $4.99 | one-time |
| J-23 Effects | $7.99 | one-time |
| CLK RS-1 | $3.99 | one-time |
| CLK GS-1 | $7.99 | one-time |
| CG-1 Chord Generator | $3.99 | one-time |
| CLK Tools Bundle | $9.99 | one-time |
| Essential Synth Bundle | $9.99 | one-time |
| Chaos LFO Bundle | $7.99 | one-time |
| VCF Bundle 1 | $9.99 | one-time |
| 1-shot Sample | $1.99 | one-time |
| Modal Percussion | $4.99 | one-time |
| CLK: TimeWarp | $4.99 | one-time |
| P-Train | $2.99 | one-time |
| ARP-1 | $7.99 | one-time |
| CPR-3 | $7.99 | one-time |


## What do users think of Audulus 4?

Overall sentiment: mixed

**Pros**

- ✨ Powerful modular environment
- 💡 Deep DSP programming capabilities
- 🎨 Intuitive and beautiful UI
- 🚀 Seamless workflow across devices
- 📚 Great for learning synthesis
- 🛠️ Highly customizable
- 🤝 Responsive developer support
- 🌟 Innovative features (canvas, shader, Lua)
- 🎵 High-quality sound engine
- 🌐 Active and helpful community

**Cons**

- 💸 Expensive in-app purchases/subscriptions
- ⚠️ Steep learning curve for beginners
- 📱 UI issues on mobile (scrolling, view obstruction)
- 📉 High CPU usage
- ❓ Lack of comprehensive documentation
- 💰 Subscription model criticized
- 🔄 Frequent OS update requirements

**Commonly reported bugs**

- iOS 18 compatibility issues (app not working)
- Save presets but no 'Load' button
- Undo command issues with DAWs
- CMD+Z causing data loss
- Opt+drag not duplicating modules
- Plugin window not resizable
- Menu filtering not functioning properly on iPhone
- Select and Import buttons not working
- Blank screen on open
- App freezes on iPad Pro
- Black screen on launch after update
- No modules appearing after iOS 18 update
- Patches not appearing after iOS 18 update

**Most requested features**

- Add 'Load' button for presets
- Improve DAW integration (Undo, duplicate)
- Resizable plugin window
- More modules (FFT/IFFT, granular buffering)
- Add CC in module
- Sync to host as AUv3
- Make upgrade path clearer from Audulus 3

## Recent user reviews (10 of 71)

All indexed reviews: https://appshunter.io/ios/app/audulus-4/id1592022030/reviews.md

### 1/5 — SECURITY RISK

*2026-07-20, version 4.7*

I really wanted to try this app, it reminds me of some old Propellerheads software I had years ago called Reason.  Unfortunately the camera comes on when the app is on.  You can’t turn it off in permissions.  You can turn off the microphone in permissions, but not the camera.  I tried deleting it an reinstalling it to wipe the memory, no good, camera light still comes on.

### 3/5 — Among the best yet confused

*2026-07-09, version 4.7*

Update: This, mi rack and Drambo are my top 3 Modular’s. This has a unique flair and great ui. I do have problems with the deceptive free thing. I get your point on the previous model(3) stuff is there. But it really promotes and shines when you have the the iap, which are not bundled correctly, some are close, but many of them really need to be either free( like the everything’s free title),  or in proper iap collection/logical method. I bought a few iap and then I could open a demo project that needed another clock iap to show how good it “can get” . As a basic example I can only use Version 3 as then I can open those lessons or patchstorage etc. so despite my complaints I guess it’s cause I feel the argument for the new all free version really hurts this. I know you can rock it as is with no iap but then you can’t demonstrate any great patches right from the start, in that regard I feel 3 is way better. Audulus could be the best with some changes. Last thing: version 3 runs perfect and no crashes. Version 4 eats cpu and also just not solid with clock audio stutters. I know it’s because newer version is probably got ace stuff under the hood and my iPad lil old so maybe that one is on me ha. Don’t mean bad vibes  though , I  can stay happy with 3 and it’s still a beast.

### 5/5 — Pretty phenomenal lego arsenal of a sound constructor set... Awesome

*2026-06-18, version 4.7*

This is pretty amazing ND NOW WITH ALL THE GOODIES BUILT IN, I am literally amazed with the potential madness at my fingertips...

### 4/5 — almost perfect app

*2026-06-18, version 4.7*

everything is working great! the only issue I have is Im unable to upload any files to the memory node with my phone. other than that the app is really cool

### 5/5 — Make sure you are on iOS 18 or higher

*2026-04-17, version 4.7*

Audulus is an amazing audio app!  Sadly, I cannot yet benefit from the updated version until I upgrade to a device that supports iOS 18+

### 1/5 — How many times are you going to try to get me to pay for this!?

*2026-04-10, version 4.7*

I’ve loved Audulus for a long time, I bought Audulus 3, I bought Audulus 4….went to use it after a while and now everything is behind a paywall again! I go to add a function generator it’s 9.99 for a pack of them I go to add a filter it’s another 9.99 for a filter pack? This is ridiculous! I’ve paid for this app twice already and now I’m expected to pay yet again but only this time pay piece by piece. I can’t justify supporting getting gouged and recharged like this regardless if it’s good or not…unless this is fixed I’m dropping Audulus and will just have to stick with MiRack.

### 5/5 — Cool as heck

*2026-03-25, version 4.7*

A lot went into this and it shows.  Amazing modular environment and I can’t wait to see what my imagination builds.

### 4/5 — COOL!!!!

*2026-03-21, version 4.7*

I forgot I ever installed this, then opened it in Ableton by accident. Then I got lost in it for hours. If you’re a music producer just starting to dip your toes into DSP, this is a must-try. This is honestly the perfect middle-ground between Formula, PlugData and Bitwig Grid; all available within a VST - and this one is much more math-centric, which feels much more intuitive for someone like me.
HOWEVER - I wouldn’t be ready to spend money on it just yet as it has a few glaring issues:
#1, you can save your presets, but there’s no ‘Load’ button. This may be accessed by the “Open user presets folder”, but for me this button does nothing.
#2, basic DAW-compatible functions are absent. This is a HUGE pain, because if you accidentally press CMD+Z by muscle memory, and your last action in your DAW was to move or insert Audulus, your DAW receives the Undo command instead of the plugin and you lose ALL your work, even if you hit Redo. Complete reset. Opt+drag on modules does not duplicate. Plugin window is not resizable. Things like that. 
#3, the UI and customization leave a lot to be desired. Specifically the outer-edge section where things like Save, Load, Prefs, etc. are supposed to live - I forget what this is called but in Audulus this part is almost completely barren. Makes the whole thing feel like a beta version.
If I felt negatively or indifferent about Audulus, I wouldn’t be writing all this. I would really love to see a more complete version of this plugin with the features I mentioned plus an addition of more modules such as FFT/IFFT conversion, granular buffering, and other things that are native to comparable apps. Looking forward to seeing this one evolve - I’ll be ready to give that 5-star review and tell all my music nerd friends about it.

### 4/5 — Cool design, menu filtering doesn’t function properly

*2026-03-21, version 4.7*

I really like the design but unfortunately the menus system is  buggy on an iPhone 17 pro.

In order to navigate to the free modules you have to scroll down past the pro ones, but the the tag system/ filtering window automatically closes after selection.  

There is an extensive amount of modules, but without that filtering being available it’s not very practical. Would be even interested in purchases pro modules if that issue was fixed.

### 5/5 — Better than MAX and developer could easily charge more

*2026-02-27, version 4.6.3*

This app is a gift from the gods. Don’t listen to the ungrateful plebs.

## Frequently asked questions about Audulus 4

### What is Audulus 4?

Audulus 4 is a powerful modular synthesizer and sound design environment that allows users to build synthesizers, design sounds, and shape audio in real time. It offers a professional-grade, low-latency performance suitable for live use and complex audio manipulation.

### What are the key features of Audulus 4?

Key features include a complete modular environment, a deep node library for building from scratch, an extensive module library for synthesis and sound design, multi-channel signal flow, next-gen multi-core audio processing, MIDI I/O, and GLSL shader node for visuals. It also supports Lua scripting for custom DSP and graphics.

### How much does Audulus 4 cost?

The core Audulus 4 application is free to download and explore, providing a complete modular environment. Premium modules, known as the Pro Module series, are available as in-app purchases, offering additional instruments and effects to expand your sonic toolkit.

### What devices is Audulus 4 compatible with?

Audulus 4 is available on iPhone, iPad, and Mac. Your modular system syncs across these devices via iCloud, allowing you to continue your work seamlessly wherever you are.

### What are some common use cases for Audulus 4?

Audulus 4 is ideal for creating unique synthesizer patches, designing custom sound effects, experimenting with complex audio routing, and performing live electronic music. Its modular nature makes it suitable for both beginners exploring sound synthesis and advanced users crafting intricate audio systems.

## Version history (last 5 releases)

### 4.7 — 2025-12-11

Audulus is now completely free — professional modular synthesis for everyone.

This is the full environment. Build anything. Explore freely. No limits, no cost.

Extend your setup with Pro Modules — meticulously-designed instruments and effects that push the boundaries of modular sound design.

New in This Version:
• Free for everyone — the complete Audulus experience
• Now on iPhone — pocket-sized modular power
• Pro Module series — premium expansions built for Audulus
• New Lua message protocol for vector graphics — faster, richer graphics
• Many refinements and performance improvements

Your modular journey starts now.

### 4.6.3 — 2025-05-02

- Bug fixes

### 4.6.2 — 2025-02-14

- Adds multiple input and output busses to the AudioUnit
- Bug fixes

### 4.6.1 — 2025-01-22

- Improve appearance of the Nodes Palette
- Back to native iOS file browser now that bugs are fixed

### 4.6 — 2024-12-03

- Introduce our own File Browser
- Fix bug loading wav files into the Memory node

## Apps similar to Audulus 4

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [SynthMaster 2](https://appshunter.io/ios/app/synthmaster-2/id1566704584) | 4.8 (451) | $4.99 | Music |
| [miRack](https://appshunter.io/ios/app/mirack/id1468259834) | 4.8 (669) | $14.99 | Music |
| [Saucillator](https://appshunter.io/ios/app/saucillator/id6752227604) | 4.9 (33) | Free | Music |
| [Aparillo](https://appshunter.io/ios/app/aparillo/id1439914019) | 4.9 (506) | Free | Music |
| [Drambo](https://appshunter.io/ios/app/drambo/id1469365718) | 4.8 (324) | $24.99 | Music |
| [DrumComputer - Synthetic Beats](https://appshunter.io/ios/app/drumcomputer-synthetic-beats/id1502238351) | 4.8 (621) | Free | Music |

## More apps by Audulus LLC

- [Sculptura 3D](https://appshunter.io/ios/app/sculptura-3d/id1321221385)
- [Sculptura Pocket](https://appshunter.io/ios/app/sculptura-pocket/id1442107915)

All apps by Audulus LLC: https://appshunter.io/developer/452619536

## Related topics

[modular synth](https://appshunter.io/ios/topics/modular-synth) · [audulus](https://appshunter.io/ios/topics/audulus) · [audulus 4](https://appshunter.io/ios/topics/audulus-4)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*