# SynthMaster 2 vs Audulus 4

The clearest difference is price: Audulus 4 at Free against SynthMaster 2's $14.99. Audulus 4 also leads on ads (none vs shown) and device support (3 vs 1). SynthMaster 2's advantage is rating (4.8 vs 4.3) and ratings volume (451 vs 74). On review sentiment, update cadence, in-app purchases and monetization model there is nothing between them.

Audulus 4 is free to download; SynthMaster 2 costs $14.99 up front. SynthMaster 2 sells 32 one-off in-app purchases 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.

SynthMaster 2 holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: SynthMaster 2 has 451 ratings behind it against 74, so its average is the more settled of the two. Written reviews split almost evenly too, at 68% and 69% positive.

SynthMaster 2 ships an update every 3 weeks, Audulus 4 monthly. The most recent releases landed on September 23, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | SynthMaster 2 | Audulus 4 |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | **[4.8 (451 ratings)](https://appshunter.io/ios/app/synthmaster-2/id1566704584/reviews)** | [4.3 (74 ratings)](https://appshunter.io/ios/app/audulus-4/id1592022030/reviews) |
| Number of ratings | **451** | 74 |
| Positive reviews | 68.5% of reviews | **69.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 918 MB | 103 MB |
| Requires iOS | **15** | 18.0 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [KV331 Audio](https://appshunter.io/developer/944155925) | [Audulus LLC](https://appshunter.io/developer/452619536) |

## What reviewers say

### SynthMaster 2

[App page](https://appshunter.io/ios/app/synthmaster-2/id1566704584)

This powerful software synthesizer offers a vast array of sound design capabilities, including multiple oscillator modes, extensive modulation options, and a wide selection of filters. Explore over 1000 factory presets or create your own unique sounds. Available as a standalone app or AUv3 plugin.

**Highlights:** Multiple oscillator modes (Basic, Additive, Wavetable, Vector), Extensive modulation architecture, 6 filter categories, Import custom wave files, 1000+ factory presets, Standalone app and AUv3 plugin

**In-app purchases (32)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BigTone Tableworks Vol.2 | $1.99 | one-time |
| Burak Yeter Synth Sounds Vol1 | $1.99 | one-time |
| Aiyn Zahev Expansion 1 | $1.99 | one-time |
| BigTone Tableworks Vol.1 | $1.99 | one-time |
| Michael Kastrup Expansion | $1.99 | one-time |
| EDM Stars Volume 1 | $1.99 | one-time |
| Nori Ubukata Pop Hits Vol.4 | $1.99 | one-time |
| Rob Lee EDM Expansion Vol.2 | $1.99 | one-time |
| Alonso Sound Future Rave | $1.99 | one-time |
| Nori Ubukata Pop Hits Vol.1 | $1.99 | one-time |
| BigTone Techno Bits Vol.1 | $1.99 | one-time |
| Club Sequences Vol.1 | $2.99 | one-time |
| Historical Synth Giants Vol.3 | $2.99 | one-time |
| Dawn of Electronic Music Vol.2 | $2.99 | one-time |
| Nori Ubukata Art Rock Basics | $2.99 | one-time |
| BigTone Analog Basics 02 | $4.99 | one-time |
| BigTone Analog Basics | $4.99 | one-time |
| BigTone Signature Sounds Vol.1 | $4.99 | one-time |
| NU Sounds of the World | $4.99 | one-time |
| Historical Synth Giants Vol.4 | $4.99 | one-time |
| Historical Synth Giants Vol.1 | $4.99 | one-time |
| Historical Synth Giants Vol.2 | $4.99 | one-time |
| Japan Vintage | $4.99 | one-time |
| NatLife Future Bass Sounds | $4.99 | one-time |
| Danyella EDM Expansion Vol.1 | $4.99 | one-time |
| Dawn of Electronic Music Vol.1 | $4.99 | one-time |
| Dawn of Electronic Music Vol.3 | $4.99 | one-time |
| Rob Lee EDM Expansion Vol.3 | $4.99 | one-time |
| Natlife Disco Funk | $4.99 | one-time |
| Insigne Essentials 4 Clubbin | $4.99 | one-time |
| Desktop Presets Upgrade | $9.99 | one-time |
| All Expansions Bundle | $49.99 | one-time |

**What reviewers like**

- 🚀 Best synth on iPad
- 👍 Delicious sound
- 👍 Tremendously powerful synth
- 👍 Great synth with complex possibilities and great sound(s)
- 👍 Perfeito

**What reviewers complain about**

- 🐛 Auswahl der Modulationsquellen funktioniert nicht richtig
- 🐛 Echt schlecht
- 🐛 Broken Preset System for a powerful synth
- 🐛 Please fix the OSC behavior on Square and Saw
- 🐛 Preset issues

**Reported bugs**

- Presets not loading correctly
- Modulation not working after loading project
- Skin resets to default
- App crashes frequently

**Requested features**

- Pitch bend/glide for imported samples
- Integration with AUM audio mixer


### 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 SynthMaster 2 free?

SynthMaster 2 costs $14.99, and also offers in-app purchases.

### Is Audulus 4 free?

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

### Which has better reviews, SynthMaster 2 or Audulus 4?

SynthMaster 2 is rated higher. SynthMaster 2 averages 4.8 out of 5 from 451 ratings, while Audulus 4 averages 4.3 from 74 ratings.

### Do SynthMaster 2 or Audulus 4 have ads?

SynthMaster 2 shows ads; Audulus 4 does not.

### Which is updated more often, SynthMaster 2 or Audulus 4?

SynthMaster 2 ships an update every 3 weeks, and Audulus 4 monthly. Most recently, SynthMaster 2 was updated on September 23, 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.*