# Scythe Synthesizer vs Audulus 4

The clearest difference is price: Audulus 4 at Free against Scythe Synthesizer's $4.99. Audulus 4 also leads on update cadence (monthly vs every 4 months) and device support (3 vs 1). Scythe Synthesizer's advantage is in-app purchases (none vs 10) and rating (4.6 vs 4.3). On ratings volume and ads there is nothing between them.

Audulus 4 is free to download; Scythe Synthesizer costs $4.99 up front. Audulus 4 sells 10 one-off in-app purchases. Scythe Synthesizer asks for nothing beyond the download.

Scythe Synthesizer holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 134 and 73 respectively. Written reviews point the same way: 77% of Scythe Synthesizer's written reviews are positive against 69% of Audulus 4's.

Scythe Synthesizer ships an update every 4 months, Audulus 4 monthly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Scythe Synthesizer | Audulus 4 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.6 (134 ratings)](https://appshunter.io/ios/app/scythe-synthesizer/id451337446/reviews)** | [4.3 (73 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews) |
| Number of ratings | **134** | 73 |
| Positive reviews | **77.3% of reviews** | 69.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 9 MB | 103 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Miles Egan](https://appshunter.io/developer/423720312) | [Audulus LLC](https://appshunter.io/developer/452619536) |

## What reviewers say

### Scythe Synthesizer

[App page](https://appshunter.io/ios/app/scythe-synthesizer/id451337446)

Design new sounds with an intuitive interface on your iPad. This synthesizer offers a wide range of sonic possibilities, from classic analog tones to unique digital effects. Record and export your creations easily.

**Highlights:** Intuitive sound design interface, Versatile oscillators (analog & digital), Audio clip recording and export, Extensive modulation, Wide range of effects, MIDI support

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative bend feature
- 🎶 Great sound quality
- 🎛️ Intuitive interface
- 🎚️ Randomization function is a winner
- ✨ Unique and engaging sounds

**What reviewers complain about**

- 🐛 Distortion on iPad Pro
- 🐛 Glitched artifacts
- 🐛 Unintended distortion
- 🐛 Crackles on iPad Pro
- 🐛 Keyboard issues (delay, sizing)

**Reported bugs**

- Doesn't load AUM after update, crashes
- Crackle on iPad Pro
- Unintended distortion, glitched artifacts on iPad Pro
- Confirming distortion on every patch on iPad Pro 11 inch
- Bad digital distortion on iPad Pro 11 inch

**Requested features**

- Ability to choose MIDI channel
- Controllable randomization range
- More presets
- Bend modulation to loop
- Bend to be tempo synced


### 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


## Frequently asked questions

### Is Scythe Synthesizer free?

Scythe Synthesizer costs $4.99, with no in-app purchases.

### Is Audulus 4 free?

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

### Which has better reviews, Scythe Synthesizer or Audulus 4?

Scythe Synthesizer is rated higher. Scythe Synthesizer averages 4.6 out of 5 from 134 ratings, while Audulus 4 averages 4.3 from 73 ratings.

### Do Scythe Synthesizer or Audulus 4 have ads?

Neither Scythe Synthesizer nor Audulus 4 shows ads.

### Which is updated more often, Scythe Synthesizer or Audulus 4?

Scythe Synthesizer ships an update every 4 months, and Audulus 4 monthly. Most recently, Scythe Synthesizer was updated on November 1, 2026 and Audulus 4 on November 3, 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.*