# Kauldron Synthesizer vs ShimmerVerb

The clearest difference is update cadence: ShimmerVerb at every 6 weeks against Kauldron Synthesizer's every 49 months. ShimmerVerb also leads on iOS requirement (11.0 vs 15.6). Kauldron Synthesizer's advantage is price ($9.99 vs $14.99) and ratings volume (136 vs 12). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Kauldron Synthesizer costs $9.99 and ShimmerVerb $14.99 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 4.6 for ShimmerVerb. That said, the two scores are not equally well evidenced: Kauldron Synthesizer has 136 ratings behind it against 12, 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 78% of ShimmerVerb's.

Kauldron Synthesizer ships an update every 49 months, ShimmerVerb every 6 weeks. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Kauldron Synthesizer | ShimmerVerb |
| --- | --- | --- |
| Price | **$9.99** | $14.99 |
| Rating | **[4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews)** | [4.6 (12 ratings)](https://appshunter.io/ios/app/shimmerverb/id1463786346/reviews) |
| Number of ratings | **136** | 12 |
| Positive reviews | **79.7% of reviews** | 77.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Size | 32 MB | 14 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yonac Inc.](https://appshunter.io/developer/288670023) | [Eventide](https://appshunter.io/developer/546518026) |

## 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


### ShimmerVerb

[App page](https://appshunter.io/ios/app/shimmerverb/id1463786346)

This app creates massive, lustrous reverbs with parallel pitch shifters for ethereal, shimmering soundscapes. It offers advanced feedback control and performance-oriented features like a "Ribbon" macro and "HotSwitch" for dynamic sound shaping.

**Highlights:** Massive lustrous reverb with parallel pitch shifters, Infinitely feedbackable signal for cascading reverbs, Adjustable feedback frequencies via cross-over network, Playable "Ribbon" performance macro, Instant parameter switching with "HotSwitch", "Freeze" button for smeared textures, AUv3 plugin and standalone app

**In-app purchases:** none


## Frequently asked questions

### Is Kauldron Synthesizer free?

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

### Is ShimmerVerb free?

ShimmerVerb costs $14.99, with no in-app purchases.

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

Kauldron Synthesizer is rated higher. Kauldron Synthesizer averages 4.6 out of 5 from 136 ratings, while ShimmerVerb averages 4.6 from 12 ratings.

### Do Kauldron Synthesizer or ShimmerVerb have ads?

Neither Kauldron Synthesizer nor ShimmerVerb shows ads.

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

Kauldron Synthesizer ships an update every 49 months, and ShimmerVerb every 6 weeks. Most recently, Kauldron Synthesizer was updated on November 11, 2026 and ShimmerVerb 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.*