# ChaosArp vs Prism MIDI Sequencer

The clearest difference is price: ChaosArp at $3.99 against Prism MIDI Sequencer's $19.99. ChaosArp also leads on in-app purchases (none vs 5) and rating (4.9 vs 4.7). Prism MIDI Sequencer's advantage is ratings volume (34 vs 9). On review sentiment, update cadence, ads and device support there is nothing between them.

ChaosArp costs $3.99 and Prism MIDI Sequencer $19.99 up front. Prism MIDI Sequencer sells 5 one-off in-app purchases. ChaosArp asks for nothing beyond the download.

ChaosArp holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 9 and 34 respectively. Written reviews complicate that: 83% of ChaosArp's written reviews are positive against 86% of Prism MIDI Sequencer's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ChaosArp | Prism MIDI Sequencer |
| --- | --- | --- |
| Price | **$3.99** | $19.99 |
| Rating | **[4.9 (9 ratings)](https://appshunter.io/ios/app/chaosarp/id6497066359/reviews)** | [4.7 (34 ratings)](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630/reviews) |
| Number of ratings | 9 | **34** |
| Positive reviews | 83.3% of reviews | **85.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 17 MB | 55 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Achillefs Sourlas](https://appshunter.io/developer/6813431693) | [Tyler Quatraro](https://appshunter.io/developer/1724470298) |

## 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


### Prism MIDI Sequencer

[App page](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630)

This app is a powerful 16-track MIDI step sequencer designed for iOS devices. It allows users to create complex musical patterns with high resolution, elastic timing, and per-step control. It integrates with external synths and samplers, offering extensive features for melody, harmony, and drum sequencing.

**Highlights:** 16-track AUv3 MIDI step sequencer, High resolution and elastic timing, Per-step control and step FX, Scale modes and flow modes for tonal tracks, 16 mini-sequencers per drum track, LFOs, arpeggiator, and generative tools, Scene and mute profile performance modes

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LFO Extension | $4.99 | one-time |
| Step FX | $4.99 | one-time |
| Multi-Sequencer  Tone Tracks | $4.99 | one-time |
| Launchkey Mini MK4 Control | $4.99 | one-time |
| Euclidean Sequencer Extension | $4.99 | one-time |


## Frequently asked questions

### Is ChaosArp free?

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

### Is Prism MIDI Sequencer free?

Prism MIDI Sequencer costs $19.99, and also offers in-app purchases.

### Which has better reviews, ChaosArp or Prism MIDI Sequencer?

ChaosArp is rated higher. ChaosArp averages 4.9 out of 5 from 9 ratings, while Prism MIDI Sequencer averages 4.7 from 34 ratings.

### Do ChaosArp or Prism MIDI Sequencer have ads?

Neither ChaosArp nor Prism MIDI Sequencer shows ads.

### Which is updated more often, ChaosArp or Prism MIDI Sequencer?

ChaosArp ships an update every 2 weeks, and Prism MIDI Sequencer every 2 weeks. Most recently, ChaosArp was updated on October 24, 2026 and Prism MIDI Sequencer on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*