# Kauldron Synthesizer vs Phosphor 3

The clearest difference is update cadence: Phosphor 3 at every 11 months against Kauldron Synthesizer's every 49 months. Phosphor 3 also leads on price ($5.99 vs $9.99) and iOS requirement (12.0 vs 15.6). Kauldron Synthesizer's advantage is ratings volume (136 vs 9) and device support (3 vs 1). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Kauldron Synthesizer costs $9.99 and Phosphor 3 $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.6 for Kauldron Synthesizer against 4.7 for Phosphor 3. That said, the two scores are not equally well evidenced: Kauldron Synthesizer has 136 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 80% of Kauldron Synthesizer's written reviews are positive against 79% of Phosphor 3's.

Kauldron Synthesizer ships an update every 49 months, Phosphor 3 every 11 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Kauldron Synthesizer | Phosphor 3 |
| --- | --- | --- |
| Price | $9.99 | **$5.99** |
| Rating | [4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews) | **[4.7 (9 ratings)](https://appshunter.io/ios/app/phosphor-3/id1499115553/reviews)** |
| Number of ratings | **136** | 9 |
| Positive reviews | **79.7% of reviews** | 78.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 11 months** |
| Monetization | Paid | Paid |
| Size | 32 MB | 27 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yonac Inc.](https://appshunter.io/developer/288670023) | [Audio Damage, Inc.](https://appshunter.io/developer/1248448317) |

## 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


### Phosphor 3

[App page](https://appshunter.io/ios/app/phosphor-3/id1499115553)

This app recreates a vintage digital synthesizer, offering a faithful emulation of a classic sound engine. It includes modern features like MPE, extensive modulation, and a new UI for sonic exploration.

**Highlights:** Vintage digital synthesizer emulation, Additive synthesis engine, MPE support, Extensive modulation routing, Preset manager, Tuning tables

**In-app purchases:** none


## Frequently asked questions

### Is Kauldron Synthesizer free?

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

### Is Phosphor 3 free?

Phosphor 3 costs $5.99, with no in-app purchases.

### Which has better reviews, Kauldron Synthesizer or Phosphor 3?

Phosphor 3 is rated higher. Kauldron Synthesizer averages 4.6 out of 5 from 136 ratings, while Phosphor 3 averages 4.7 from 9 ratings.

### Do Kauldron Synthesizer or Phosphor 3 have ads?

Neither Kauldron Synthesizer nor Phosphor 3 shows ads.

### Which is updated more often, Kauldron Synthesizer or Phosphor 3?

Kauldron Synthesizer ships an update every 49 months, and Phosphor 3 every 11 months. Most recently, Kauldron Synthesizer was updated on October 26, 2026 and Phosphor 3 on October 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.*