# Audulus 4 vs Fret Metric

The clearest difference is in-app purchases: Fret Metric at none against Audulus 4's 27. Fret Metric also leads on iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. Fret Metric asks for nothing beyond the download.

## The numbers

| Metric | Audulus 4 | Fret Metric |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (73 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews)** | — |
| Number of ratings | **73** | — |
| Positive reviews | 69.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Free with in-app purchases | — |
| Size | 103 MB | 36 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Audulus LLC](https://appshunter.io/developer/452619536) | [Shalva Gegia](https://appshunter.io/developer/1440375611) |

## What reviewers say

### 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


### Fret Metric

[App page](https://appshunter.io/ios/app/fret-metric/id6760311321)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Audulus 4 free?

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

### Is Fret Metric free?

Fret Metric is free to download, with no in-app purchases.

### Do Audulus 4 or Fret Metric have ads?

Neither Audulus 4 nor Fret Metric shows ads.

---

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