# VOLT Synth vs Kauldron Synthesizer

The clearest difference is price: Kauldron Synthesizer at $9.99 against VOLT Synth's $19.99. Kauldron Synthesizer also leads on in-app purchases (none vs 3) and review sentiment (80% vs 63%). VOLT Synth's advantage is update cadence (every 2 weeks vs every 49 months) and iOS requirement (9.0 vs 15.6). On rating, ratings volume, ads and device support there is nothing between them.

VOLT Synth costs $19.99 and Kauldron Synthesizer $9.99 up front. VOLT Synth sells 3 one-off in-app purchases. Kauldron Synthesizer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for VOLT Synth against 4.6 for Kauldron Synthesizer. Both are backed by a comparable volume of ratings — 193 and 136 respectively. Written reviews are what separate them: 63% of VOLT Synth's written reviews are positive against 80% of Kauldron Synthesizer's.

VOLT Synth ships an update every 2 weeks, Kauldron Synthesizer every 49 months. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | VOLT Synth | Kauldron Synthesizer |
| --- | --- | --- |
| Price | $19.99 | **$9.99** |
| Rating | [4.6 (193 ratings)](https://appshunter.io/ios/app/volt-synth/id1185984394/reviews) | [4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews) |
| Number of ratings | **193** | 136 |
| Positive reviews | 62.9% of reviews | **79.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 49 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 92 MB | 32 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Yonac Inc.](https://appshunter.io/developer/288670023) |

## What reviewers say

### VOLT Synth

[App page](https://appshunter.io/ios/app/volt-synth/id1185984394)

This app is a virtual analog synthesizer designed for expressive sound creation. It supports multidimensional polyphonic expression (MPE) and offers a variety of synth voice features, built-in effects, and keyboard layouts. It's compatible with MPE hardware and software, as well as standard MIDI controllers.

**Highlights:** Virtual analog synthesizer, Multidimensional Polyphonic Expression (MPE), Expressive synth engine, Multiple keyboard layouts, Built-in stereo effects, 100+ factory presets, Standalone and AUv3 support

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dub Pack | Free | one-time |
| haQ attaQ paQ | $3.99 | one-time |
| Red Sky Lullaby Pack | $3.99 | one-time |

**What reviewers like**

- 🎶 Great sounds
- ✨ Intuitive UI
-  MPE integration
- 🎵 Expressive
- 💻 Good for travel

**What reviewers complain about**

- 🐛 Crashing frequently
- ⚠️ Unstable on newer iOS
- 🎛️ Cumbersome sound switching
- 📉 Poor performance
-  unresponsive controls

**Reported bugs**

- No MIDI input after 30 seconds
- Crashing when using multiple AU instances
- Presets disappear after iOS 14 update
- Standalone mode broken on recent iOS
- AU3 not working in Cubasis/NanoStudio 2

**Requested features**

- Two fields for sound forward/backward
- New features and sounds for MPE
- Dedicated strings section in presets
- Randomize function for LFOs/envelopes
- Larger fonts in preset display


### 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 VOLT Synth free?

VOLT Synth costs $19.99, and also offers in-app purchases.

### Is Kauldron Synthesizer free?

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

### Which has better reviews, VOLT Synth or Kauldron Synthesizer?

VOLT Synth and Kauldron Synthesizer are both rated 4.6 out of 5 on the App Store, from 193 and 136 ratings respectively.

### Do VOLT Synth or Kauldron Synthesizer have ads?

Neither VOLT Synth nor Kauldron Synthesizer shows ads.

### Which is updated more often, VOLT Synth or Kauldron Synthesizer?

VOLT Synth ships an update every 2 weeks, and Kauldron Synthesizer every 49 months. Most recently, VOLT Synth was updated on September 20, 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.*