# Kauldron Synthesizer vs Popsicle FX

The clearest difference is update cadence: Popsicle FX at weekly against Kauldron Synthesizer's every 49 months. Popsicle FX also leads on price ($4.99 vs $9.99) and iOS requirement (11.4 vs 15.6). Kauldron Synthesizer's advantage is review sentiment (80% vs 65%) and ratings volume (136 vs 37). On rating, ads, in-app purchases and monetization model there is nothing between them.

Kauldron Synthesizer costs $9.99 and Popsicle FX $4.99 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 4.5. Both are backed by a comparable volume of ratings — 136 and 37 respectively. Written reviews point the same way: 80% of Kauldron Synthesizer's written reviews are positive against 65% of Popsicle FX's.

Kauldron Synthesizer ships an update every 49 months, Popsicle FX weekly. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Kauldron Synthesizer | Popsicle FX |
| --- | --- | --- |
| Price | $9.99 | **$4.99** |
| Rating | **[4.6 (136 ratings)](https://appshunter.io/ios/app/kauldron-synthesizer/id1292510609/reviews)** | [4.5 (37 ratings)](https://appshunter.io/ios/app/popsicle-fx/id1503338046/reviews) |
| Number of ratings | **136** | 37 |
| Positive reviews | **79.7% of reviews** | 64.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 32 MB | 47 MB |
| Requires iOS | 15.6 | **11.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yonac Inc.](https://appshunter.io/developer/288670023) | [Kai Aras](https://appshunter.io/developer/370820899) |

## 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


### Popsicle FX

[App page](https://appshunter.io/ios/app/popsicle-fx/id1503338046)

This app offers a dual multi-effects processor with 24 distinct audio effects. It allows for flexible routing of effects in series, parallel, or stereo channels, and features an XY pad for dynamic parameter control. An advanced mode provides a mod-matrix, LFO, and Envelope Follower for complex sound design.

**Highlights:** 2 independent stereo effects engines, 24 effect algorithms, Series, parallel, and stereo channel routing, Recordable XY Pad for parameter control, Advanced mod-matrix with LFO and Envelope Follower, AUv3 and standalone support

**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 Popsicle FX free?

Popsicle FX costs $4.99, with no in-app purchases.

### Which has better reviews, Kauldron Synthesizer or Popsicle FX?

Kauldron Synthesizer is rated higher. Kauldron Synthesizer averages 4.6 out of 5 from 136 ratings, while Popsicle FX averages 4.5 from 37 ratings.

### Do Kauldron Synthesizer or Popsicle FX have ads?

Neither Kauldron Synthesizer nor Popsicle FX shows ads.

### Which is updated more often, Kauldron Synthesizer or Popsicle FX?

Kauldron Synthesizer ships an update every 49 months, and Popsicle FX weekly. Most recently, Kauldron Synthesizer was updated on October 26, 2026 and Popsicle FX on October 29, 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.*