# iVoxel vs Kauldron Synthesizer

The clearest difference is rating: Kauldron Synthesizer at 4.6 against iVoxel's 3.3. Kauldron Synthesizer also leads on review sentiment (80% vs 55%) and ratings volume (136 vs 17). iVoxel's advantage is update cadence (every 5 months vs every 49 months) and price ($6.99 vs $9.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

iVoxel costs $6.99 and Kauldron Synthesizer $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kauldron Synthesizer holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: Kauldron Synthesizer has 136 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 55% of iVoxel's written reviews are positive against 80% of Kauldron Synthesizer's.

iVoxel ships an update every 5 months, Kauldron Synthesizer every 49 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | iVoxel | Kauldron Synthesizer |
| --- | --- | --- |
| Price | **$6.99** | $9.99 |
| Rating | [3.3 (17 ratings)](https://appshunter.io/ios/app/ivoxel/id382428641/reviews) | **[4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews)** |
| Number of ratings | 17 | **136** |
| Positive reviews | 54.9% of reviews | **79.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 49 months |
| Monetization | Paid | Paid |
| Size | 46 MB | 32 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Harry Gohs](https://appshunter.io/developer/382428644) | [Yonac Inc.](https://appshunter.io/developer/288670023) |

## What reviewers say

### iVoxel

[App page](https://appshunter.io/ios/app/ivoxel/id382428641)

This app transforms your voice into a singing machine using a powerful vocoder and synthesizer. It allows real-time voice manipulation, pitch correction, and the creation of unique vocal effects from recorded speech.

**Highlights:** Real-time voice analysis and resynthesis, 20+2 Channel vocoder, Pitch follower and automatic tuning, Voice spectrum recorder (voxels), Included prerecorded voxels, Live keyboard playback of vocoded voice, Polyphonic synthesizer with analog waves

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🎵 Excellent sound quality and vocoder capabilities
- 💡 Innovative vocal sound design tool with unique spectral shaping
- 🎹 Versatile instrument for creating robot/Kraftwerk-style vocals
- 👍 Intuitive once users understand the interface
- 🎧 Works well with built-in microphone for live vocoding

**What reviewers complain about**

- 🐛 Frequent crashes and stability issues across iOS versions
- ❌ Poor documentation and unclear user interface
- 🔇 Volume levels inconsistent - too quiet or too loud
- ⚠️ Unreliable audio input/output routing
- 🚫 Limited microphone compatibility and connection issues

**Reported bugs**

- App crashes on launch or during use
- Hangs when changing presets or settings
- Random background noise and clicking sounds
- Microphone input not recognized or working intermittently
- No sound output in standalone or Audiobus mode

**Requested features**

- AU v3 plugin support for modern DAW integration
- Audiobus 3 and IAA (Inter-App Audio) support
- Core MIDI support beyond Akai controllers
- Lightning to USB audio interface compatibility
- Custom word/text input for voice synthesis


### 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 iVoxel free?

iVoxel costs $6.99, with no in-app purchases.

### Is Kauldron Synthesizer free?

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

### Which has better reviews, iVoxel or Kauldron Synthesizer?

Kauldron Synthesizer is rated higher. iVoxel averages 3.3 out of 5 from 17 ratings, while Kauldron Synthesizer averages 4.6 from 136 ratings.

### Do iVoxel or Kauldron Synthesizer have ads?

Neither iVoxel nor Kauldron Synthesizer shows ads.

### Which is updated more often, iVoxel or Kauldron Synthesizer?

iVoxel ships an update every 5 months, and Kauldron Synthesizer every 49 months. Most recently, iVoxel was updated on November 6, 2026 and Kauldron Synthesizer 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.*