# ChaosArp vs RetroSFX

The clearest difference is price: RetroSFX at $0.99 against ChaosArp's $3.99. ChaosArp's advantage is update cadence (every 2 weeks vs every 5 weeks) and device support. On in-app purchases there is nothing between them.

ChaosArp costs $3.99 and RetroSFX $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ChaosArp ships an update every 2 weeks, RetroSFX every 5 weeks. The most recent releases landed on November 4, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ChaosArp | RetroSFX |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | **[4.9 (9 ratings)](https://appshunter.io/ios/app/chaosarp/id6497066359/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Monetization | Paid | — |
| Size | 17 MB | 133 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Achillefs Sourlas](https://appshunter.io/developer/6813431693) | [Ali Taleb](https://appshunter.io/developer/1635037808) |

## What reviewers say

### ChaosArp

[App page](https://appshunter.io/ios/app/chaosarp/id6497066359)

This music app generates complex and dynamic MIDI patterns using advanced algorithms. It offers a unique rhythm event feature and variance control for extensive customization, allowing users to create evolving musical sequences.

**Highlights:** Arpeggiator and step sequencer modes, Rhythm event feature with 13 algorithms, Pitch and rhythm variance control, Scale quantizer, Randomizable velocity and duration, 4 performance buttons

**In-app purchases:** none


### RetroSFX

[App page](https://appshunter.io/ios/app/retrosfx/id6761139769)

**In-app purchases:** none


## Frequently asked questions

### Is ChaosArp free?

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

### Is RetroSFX free?

RetroSFX costs $0.99, with no in-app purchases.

### Which is updated more often, ChaosArp or RetroSFX?

ChaosArp ships an update every 2 weeks, and RetroSFX every 5 weeks. Most recently, ChaosArp was updated on November 4, 2026 and RetroSFX 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.*