# iChromatic vs Audulus 4

The clearest difference is price: Audulus 4 at Free against iChromatic's $19.99. Audulus 4 also leads on rating (4.3 vs 3.0) and update cadence (monthly vs every 15 months). iChromatic's advantage is in-app purchases (none vs 27) and iOS requirement (12.0 vs 18.0). On ads and device support there is nothing between them.

Audulus 4 is free to download; iChromatic costs $19.99 up front. Audulus 4 sells 27 in-app purchases, starting at $4.99 per month. iChromatic asks for nothing beyond the download.

Audulus 4 holds the better App Store score, 4.3 against 3.0. That said, the two scores are not equally well evidenced: Audulus 4 has 73 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of iChromatic's written reviews are positive against 69% of Audulus 4's.

iChromatic ships an update every 15 months, Audulus 4 monthly. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iChromatic | Audulus 4 |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/ichromatic/id305698121/reviews) | **[4.3 (73 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews)** |
| Number of ratings | 1 | **73** |
| Positive reviews | 50.0% of reviews | **69.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 103 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [HotPaw Productions](https://appshunter.io/developer/285074853) | [Audulus LLC](https://appshunter.io/developer/452619536) |

## What reviewers say

### iChromatic

[App page](https://appshunter.io/ios/app/ichromatic/id305698121)

This app provides precise instrument tuning using your device's microphone and a visual strobe display. It offers frequency readouts and responsive waterfall strobes for accurate pitch matching. Configure reference frequencies and tune a wide range of notes.

**Highlights:** Visual strobe display for tuning, Frequency readout in Hz and cents, Accurate waterfall strobe panes, Concert A reference frequency adjustment, Wide tuning range

**In-app purchases:** none


### 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 iChromatic free?

iChromatic costs $19.99, with no in-app purchases.

### Is Audulus 4 free?

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

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

Audulus 4 is rated higher. iChromatic averages 3.0 out of 5 from 1 ratings, while Audulus 4 averages 4.3 from 73 ratings.

### Do iChromatic or Audulus 4 have ads?

Neither iChromatic nor Audulus 4 shows ads.

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

iChromatic ships an update every 15 months, and Audulus 4 monthly. Most recently, iChromatic was updated on October 8, 2026 and Audulus 4 on October 24, 2026.

---

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