# Aparillo vs Audulus 4

The clearest difference is rating: Aparillo at 4.9 against Audulus 4's 4.3. Aparillo also leads on review sentiment (88% vs 69%) and ratings volume (506 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. Aparillo 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.

Aparillo holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Aparillo has 506 ratings behind it against 74, so its average is the more settled of the two. Written reviews point the same way: 88% of Aparillo's written reviews are positive against 69% of Audulus 4's.

Aparillo ships an update every 4 months, Audulus 4 monthly. The most recent releases landed on September 17, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Aparillo | Audulus 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (506 ratings)](https://appshunter.io/ios/app/aparillo/id1439914019/reviews)** | [4.3 (74 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews) |
| Number of ratings | **506** | 74 |
| Positive reviews | **88.5% 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 | 51 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

### Aparillo

[App page](https://appshunter.io/ios/app/aparillo/id1439914019)

This advanced FM synthesizer creates complex soundscapes, atmospheres, and a wide range of timbres for film, TV, and games. It features two interacting FM synths, integrated effects, and an intuitive 'Orbiter' for one-touch sound morphing. Seamlessly integrate with your mobile studio setup via MIDI and Audio Unit v3 support.

**Highlights:** 16-voice FM Synthesizer, Complex sound design, Integrated FX (Filter, Delay, Reverb, Spacializer), Orbiter for sound morphing, Standalone & Audio Unit v3 support, MIDI and Ableton Link integration, iCloud Preset Sync

**In-app purchases (1)**

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

**What reviewers like**

- 🚀 Powerful sound design capabilities
- 👍 Intuitive and creative interface
- 🎨 Cinematic and otherworldly sounds
- 💡 Innovative orbit and spatial features
- 🔥 Excellent presets and sound quality

**What reviewers complain about**

- 🐛 Occasional crashes and stability issues
- 🔍 Lack of clear documentation and tutorials
- 📱 UI not optimized for larger iPad screens
- 💰 Paid upgrade required for full functionality

**Reported bugs**

- Saved patches not compatible across versions
- Orbiter parameters not accessible on latest iOS

**Requested features**

- More preset packs and sound libraries
- Improved MIDI and automation support
- Custom tuning and scale options
- Expanded keyboard and note range


### 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 Aparillo free?

Aparillo 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, Aparillo or Audulus 4?

Aparillo is rated higher. Aparillo averages 4.9 out of 5 from 506 ratings, while Audulus 4 averages 4.3 from 74 ratings.

### Do Aparillo or Audulus 4 have ads?

Neither Aparillo nor Audulus 4 shows ads.

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

Aparillo ships an update every 4 months, and Audulus 4 monthly. Most recently, Aparillo was updated on September 17, 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.*