# Kauldron Synthesizer vs VAPoly

The clearest difference is update cadence: VAPoly at every 3 months against Kauldron Synthesizer's every 49 months. VAPoly also leads on price ($3.99 vs $9.99) and rating (5.0 vs 4.6). Kauldron Synthesizer's advantage is ratings volume (136 vs 16). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Kauldron Synthesizer costs $9.99 and VAPoly $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VAPoly holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Kauldron Synthesizer has 136 ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 80% of Kauldron Synthesizer's written reviews are positive against 83% of VAPoly's.

Kauldron Synthesizer ships an update every 49 months, VAPoly every 3 months. The most recent releases landed on October 20, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Kauldron Synthesizer | VAPoly |
| --- | --- | --- |
| Price | $9.99 | **$3.99** |
| Rating | [4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews) | **[5.0 (16 ratings)](https://appshunter.io/ios/app/vapoly/id1630490210/reviews)** |
| Number of ratings | **136** | 16 |
| Positive reviews | 79.7% of reviews | **83.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 32 MB | 19 MB |
| Requires iOS | 15.6 | **15.2** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Yonac Inc.](https://appshunter.io/developer/288670023) | [Ryo Togawa](https://appshunter.io/developer/1474193056) |

## What reviewers say

### 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


### VAPoly

[App page](https://appshunter.io/ios/app/vapoly/id1630490210)

This virtual analog synthesizer offers 8-voice polyphony with built-in effects, a sequencer, and parameter automation. It functions as a standalone app or an Audio Unit Extension, supporting iCloud Drive and various MIDI and audio export options.

**Highlights:** Virtual analog 8-voice polyphony, Built-in effects (delay, chorus, reverb, etc.), 16-bar sequencer with parameter automation, Oscillators with modulation capabilities, Standalone app and AUv3 extension, iCloud Drive support for cross-device projects

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Kauldron Synthesizer free?

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

### Is VAPoly free?

VAPoly costs $3.99, with no in-app purchases.

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

VAPoly is rated higher. Kauldron Synthesizer averages 4.6 out of 5 from 136 ratings, while VAPoly averages 5.0 from 16 ratings.

### Do Kauldron Synthesizer or VAPoly have ads?

Neither Kauldron Synthesizer nor VAPoly shows ads.

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

Kauldron Synthesizer ships an update every 49 months, and VAPoly every 3 months. Most recently, Kauldron Synthesizer was updated on October 20, 2026 and VAPoly on October 26, 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.*