# Audulus 4 vs Piano Chord Practice

The clearest difference is price: Audulus 4 at Free against Piano Chord Practice's $2.99. Audulus 4 also leads on iOS requirement (18.0 vs 26.0). Piano Chord Practice's advantage is in-app purchases (none vs 10) and update cadence (every 5 days vs monthly). On ads and device support there is nothing between them.

Audulus 4 is free to download; Piano Chord Practice costs $2.99 up front. Audulus 4 sells 10 one-off in-app purchases. Piano Chord Practice asks for nothing beyond the download.

Audulus 4 ships an update monthly, Piano Chord Practice every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Audulus 4 | Piano Chord Practice |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| 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 | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 103 MB | 210 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Audulus LLC](https://appshunter.io/developer/452619536) | [yuji yoshie](https://appshunter.io/developer/6773540002) |

## 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 (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-shot Sample | $1.99 | one-time |
| CG-1 Chord Generator | $3.99 | one-time |
| J-23 Reverb | $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 |

**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


### Piano Chord Practice

[App page](https://appshunter.io/ios/app/piano-chord-practice/id6773540000)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Audulus 4 free?

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

### Is Piano Chord Practice free?

Piano Chord Practice costs $2.99, with no in-app purchases.

### Do Audulus 4 or Piano Chord Practice have ads?

Neither Audulus 4 nor Piano Chord Practice shows ads.

### Which is updated more often, Audulus 4 or Piano Chord Practice?

Audulus 4 ships an update monthly, and Piano Chord Practice every 5 days. Most recently, Audulus 4 was updated on November 3, 2026 and Piano Chord Practice on October 31, 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.*