# Factory vs Audulus 4

The clearest difference is rating: Factory at 4.9 against Audulus 4's 4.3. Factory also leads on review sentiment (81% vs 69%) and ratings volume (487 vs 74). Audulus 4's advantage is update cadence (monthly vs every 4 months) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Factory sells 1 one-off in-app purchase and Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Factory holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Factory has 487 ratings behind it against 74, so its average is the more settled of the two. Written reviews point the same way: 81% of Factory's written reviews are positive against 69% of Audulus 4's.

Factory ships an update every 4 months, Audulus 4 monthly. The most recent releases landed on August 12, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Factory | Audulus 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (487 ratings)](https://appshunter.io/ios/app/factory-modular-synthesizer/id1458743434/reviews)** | [4.3 (74 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews) |
| Number of ratings | **487** | 74 |
| Positive reviews | **81.4% of reviews** | 69.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 347 MB | 103 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Sugar Bytes GmbH](https://appshunter.io/developer/614418826) | [Audulus LLC](https://appshunter.io/developer/452619536) |

## What reviewers say

### Factory

[App page](https://appshunter.io/ios/app/factory-modular-synthesizer/id1458743434)

Create complex and organic sounds with a powerful modular synthesizer. Explore a vast array of synthesis types, a deep modulation matrix, and dynamic signal flow. Easily find and morph between sounds with a built-in browser and crossfader.

**Highlights:** Modular synthesis with extensive modulation matrix, Multiple oscillator engines and synthesis types, Dynamic signal flow with 3-FX chain, Morph crossfader for sound transformation, Preset browser with tagging and rating, Sequencers, Arpeggiator, and Quantizer

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Factory Full Version | $24.99 | one-time |

**What reviewers like**

- 🚀 Powerful synth engine
- 👍 Intuitive and easy to use interface
- 🎨 Vast sound design capabilities
- 💡 Innovative modulation matrix
- 🎶 Inspiring and unique presets

**What reviewers complain about**

- 🐛 Occasional crashes and freezes
- 🔌 Compatibility issues with other apps
- 🖥️ Pixelated interface on high-res displays
- 🔇 Note-sticking problems

**Reported bugs**

- Presets not loading correctly in DAW projects
- CC assignment issues causing controls to freeze

**Requested features**

- Ability to modulate morph slider
- Option to modulate effects parameters individually
- Arpeggiator with retrigger on key press
- Better integration with GarageBand and other DAWs


### Audulus 4

[App page](https://appshunter.io/ios/app/audulus-4/id1592022030)

Create and shape sounds with a professional-grade modular synthesizer environment. Explore a vast library of modules for synthesis and sound design, with the option to expand your toolkit with premium instruments and effects. Available across Apple devices for seamless workflow.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases (27)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audulus Pro (1 Month) | $4.99 | per month |
| Audulus Pro (1 Year) | $29.99 | per year |
| 1-shot Sample | $1.99 | one-time |
| P-Train | $2.99 | one-time |
| CLK RS-1 | $3.99 | one-time |
| CG-1 Chord Generator | $3.99 | one-time |
| CLK Clock Generator | $4.99 | one-time |
| MetaEnvelope | $4.99 | one-time |
| Modal Percussion | $4.99 | one-time |
| CLK: TimeWarp | $4.99 | one-time |
| CPR-1 | $4.99 | one-time |
| LMT-1 | $4.99 | one-time |
| MS-FUNC | $5.99 | one-time |
| CLK SS-516 | $7.99 | one-time |
| J-23 Reverb | $7.99 | one-time |
| J-23 Effects | $7.99 | one-time |
| CLK GS-1 | $7.99 | one-time |
| Chaos LFO Bundle | $7.99 | one-time |
| ARP-1 | $7.99 | one-time |
| CPR-3 | $7.99 | one-time |
| SynD-K1 | $7.99 | one-time |
| TRIKOR VCO | $9.99 | one-time |
| CLK Tools Bundle | $9.99 | one-time |
| Essential Synth Bundle | $9.99 | one-time |
| VCF Bundle 1 | $9.99 | one-time |
| J-23 Space Console | $14.99 | one-time |
| Patch Editing | $29.99 | one-time |

**What reviewers like**

- ✨ Powerful modular environment
- 💡 Deep DSP programming capabilities
- 🎨 Intuitive and beautiful UI
- 🚀 Seamless workflow across devices
- 📚 Great for learning synthesis

**What reviewers complain about**

- 💸 Expensive in-app purchases/subscriptions
- ⚠️ Steep learning curve for beginners
- 📱 UI issues on mobile (scrolling, view obstruction)
- 📉 High CPU usage
- ❓ Lack of comprehensive documentation

**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

**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


## Frequently asked questions

### Is Factory free?

Factory is free to download, with in-app purchases available.

### Is Audulus 4 free?

Audulus 4 is free to download, with in-app purchases available.

### Which has better reviews, Factory or Audulus 4?

Factory is rated higher. Factory averages 4.9 out of 5 from 487 ratings, while Audulus 4 averages 4.3 from 74 ratings.

### Do Factory or Audulus 4 have ads?

Neither Factory nor Audulus 4 shows ads.

### Which is updated more often, Factory or Audulus 4?

Factory ships an update every 4 months, and Audulus 4 monthly. Most recently, Factory was updated on August 12, 2026 and Audulus 4 on September 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*