# SynthMaster One vs Kauldron Synthesizer

The clearest difference is in-app purchases: Kauldron Synthesizer at none against SynthMaster One's 11. Kauldron Synthesizer also leads on review sentiment (80% vs 64%). SynthMaster One's advantage is update cadence (every 2 months vs every 49 months) and ratings volume (743 vs 136). On price, rating, ads and device support there is nothing between them.

SynthMaster One costs $9.99 and Kauldron Synthesizer $9.99 up front. SynthMaster One sells 11 one-off in-app purchases. Kauldron Synthesizer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for SynthMaster One against 4.6 for Kauldron Synthesizer. That said, the two scores are not equally well evidenced: SynthMaster One has 743 ratings behind it against 136, so its average is the more settled of the two. Written reviews are what separate them: 64% of SynthMaster One's written reviews are positive against 80% of Kauldron Synthesizer's.

SynthMaster One ships an update every 2 months, Kauldron Synthesizer every 49 months. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | SynthMaster One | Kauldron Synthesizer |
| --- | --- | --- |
| Price | $9.99 | $9.99 |
| Rating | **[4.7 (743 ratings)](https://appshunter.io/ios/app/synthmaster-one/id1254353266/reviews)** | [4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews) |
| Number of ratings | **743** | 136 |
| Positive reviews | 63.8% of reviews | **79.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 49 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 402 MB | 32 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KV331 Audio](https://appshunter.io/developer/944155925) | [Yonac Inc.](https://appshunter.io/developer/288670023) |

## What reviewers say

### SynthMaster One

[App page](https://appshunter.io/ios/app/synthmaster-one/id1254353266)

This powerful wavetable synthesizer app offers an intuitive workflow for creating unique sounds. It features a rich library of wavetables, inspiring presets, and a semi-modular architecture for deep sound design. Easily sync data across devices and integrate with DAWs.

**Highlights:** Wavetable synthesis, Semi-modular architecture, 650 factory presets, AUv3 support, Cross-platform cloud sync, Real-time modulation feedback, 32-step arpeggiator/sequencer

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BigTone Club Construction Set | $4.99 | one-time |
| True Trance Sounds Volume 1 | $4.99 | one-time |
| Vandalism Future House | $4.99 | one-time |
| NatLife Retrowave Sounds Vol.1 | $4.99 | one-time |
| Demis Hellen Euphoric Trance | $4.99 | one-time |
| Venus Theory Trap Sounds | $4.99 | one-time |
| Vandalism Shocking Future Bass | $4.99 | one-time |
| NatLife Progressive&Deep Vol.1 | $4.99 | one-time |
| Bluffmunkey Cinematic Sounds | $4.99 | one-time |
| Desktop Presets Upgrade | $7.99 | one-time |
| SM One Expansions Bundle | $24.99 | one-time |

**What reviewers like**

- 🚀 Powerful synth engine
- 👍 Extensive preset library
- 🎨 Versatile sound design capabilities
- 💡 Free desktop version expansions on iPad
- 🎹 Excellent sound quality and tone

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🔋 Battery drain in background
- 🤔 Confusing in-app purchase system
- 👎 UI/UX could use improvement
- 🔇 Audio issues and no sound

**Reported bugs**

- Stuck notes and MIDI issues
- Preset loading crashes
- Restore purchases not working
- Incompatibility with certain DAWs

**Requested features**

- Add custom wavetable support
- Improve MIDI mapping and MPE functionality
- Optimize performance on older devices
- Streamline preset management and browsing


### Kauldron Synthesizer

[App page](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609)

This app combines classic analog synth warmth with AI-powered sound design. It offers intelligent preset generation, extensive modulation options, and a powerful arpeggiator for creating rich synth textures.

**Highlights:** AI-powered preset generation (SPAWN²), Analog modeling oscillators, Extensive modulation matrix, Dual XY-pads for control, Powerful arpeggiator, AUv3 plugin support, Over 900 presets

**In-app purchases:** none

**What reviewers like**

- ✨ Warm and rich sound
- 👍 Easy to use interface
- 💡 Great presets included
- 🚀 Powerful sound engine
- 🌟 High quality emulation

**What reviewers complain about**

- 🐛 Buggy AUv3 implementation
- 🔊 Shrill noise issue
- 🔇 No Bluetooth speaker support
- ⚠️ Strange behavior/no reset
- 📉 Lacks oomph/personality

**Reported bugs**

- Oscillators cannot be set to -1 octave
- Shrill noise
- No Bluetooth speaker output
- Fails to reload with Logic projects
- Cannot load into Logic Pro

**Requested features**

- Bring synths/effects to macOS
- Mac App version
- More comprehensive FX section (distortion/saturation)
- MIDI-out for arpeggiator
- Drum machine, PAD launcher, DAW


## Frequently asked questions

### Is SynthMaster One free?

SynthMaster One costs $9.99, and also offers in-app purchases.

### Is Kauldron Synthesizer free?

Kauldron Synthesizer costs $9.99, with no in-app purchases.

### Which has better reviews, SynthMaster One or Kauldron Synthesizer?

SynthMaster One is rated higher. SynthMaster One averages 4.7 out of 5 from 743 ratings, while Kauldron Synthesizer averages 4.6 from 136 ratings.

### Do SynthMaster One or Kauldron Synthesizer have ads?

Neither SynthMaster One nor Kauldron Synthesizer shows ads.

### Which is updated more often, SynthMaster One or Kauldron Synthesizer?

SynthMaster One ships an update every 2 months, and Kauldron Synthesizer every 49 months. Most recently, SynthMaster One was updated on September 22, 2026 and Kauldron Synthesizer on September 24, 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.*