# Kauldron Synthesizer vs NuRack Auv3 FX Processor

The clearest difference is update cadence: NuRack Auv3 FX Processor at every 3 weeks against Kauldron Synthesizer's every 49 months. NuRack Auv3 FX Processor also leads on iOS requirement (13 vs 15.6). Kauldron Synthesizer's advantage is price ($9.99 vs $12.99) and ratings volume (136 vs 41). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Kauldron Synthesizer costs $9.99 and NuRack Auv3 FX Processor $12.99 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 NuRack Auv3 FX Processor. Both are backed by a comparable volume of ratings — 136 and 41 respectively. Written reviews are what separate them: 80% of Kauldron Synthesizer's written reviews are positive against 84% of NuRack Auv3 FX Processor's.

Kauldron Synthesizer ships an update every 49 months, NuRack Auv3 FX Processor every 3 weeks. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Kauldron Synthesizer | NuRack Auv3 FX Processor |
| --- | --- | --- |
| Price | **$9.99** | $12.99 |
| Rating | [4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews) | **[4.7 (41 ratings)](https://appshunter.io/ios/app/nurack-auv3-fx-processor/id1520146960/reviews)** |
| Number of ratings | **136** | 41 |
| Positive reviews | 79.7% of reviews | **84.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 32 MB | 26 MB |
| Requires iOS | 15.6 | **13** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yonac Inc.](https://appshunter.io/developer/288670023) | [4Pockets.com](https://appshunter.io/developer/370131860) |

## 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


### NuRack Auv3 FX Processor

[App page](https://appshunter.io/ios/app/nurack-auv3-fx-processor/id1520146960)

Design custom audio and MIDI effects racks with over 80 building blocks. Route audio in series or parallel and create unique interfaces for your sound processing needs.

**Highlights:** Design custom effects racks, Over 80 audio and MIDI building blocks, Full routing control (series/parallel), Customizable interface builder, Seamless effect switching, 3 independent audio racks mode, Extensive automation options

**In-app purchases:** none


## Frequently asked questions

### Is Kauldron Synthesizer free?

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

### Is NuRack Auv3 FX Processor free?

NuRack Auv3 FX Processor costs $12.99, with no in-app purchases.

### Which has better reviews, Kauldron Synthesizer or NuRack Auv3 FX Processor?

NuRack Auv3 FX Processor is rated higher. Kauldron Synthesizer averages 4.6 out of 5 from 136 ratings, while NuRack Auv3 FX Processor averages 4.7 from 41 ratings.

### Do Kauldron Synthesizer or NuRack Auv3 FX Processor have ads?

Neither Kauldron Synthesizer nor NuRack Auv3 FX Processor shows ads.

### Which is updated more often, Kauldron Synthesizer or NuRack Auv3 FX Processor?

Kauldron Synthesizer ships an update every 49 months, and NuRack Auv3 FX Processor every 3 weeks. Most recently, Kauldron Synthesizer was updated on October 20, 2026 and NuRack Auv3 FX Processor on October 25, 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.*