# Harmonicer vs Prism MIDI Sequencer

The clearest difference is price: Harmonicer at $7.99 against Prism MIDI Sequencer's $19.99. Harmonicer also leads on in-app purchases (none vs 5) and update cadence (every 4 days vs every 2 weeks). On rating, review sentiment, ratings volume and ads there is nothing between them.

Harmonicer costs $7.99 and Prism MIDI Sequencer $19.99 up front. Prism MIDI Sequencer sells 5 one-off in-app purchases. Harmonicer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Harmonicer against 4.8 for Prism MIDI Sequencer. Both are backed by a comparable volume of ratings — 12 and 33 respectively. Written reviews are what separate them: 80% of Harmonicer's written reviews are positive against 86% of Prism MIDI Sequencer's.

Harmonicer ships an update every 4 days, Prism MIDI Sequencer every 2 weeks. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Harmonicer | Prism MIDI Sequencer |
| --- | --- | --- |
| Price | **$7.99** | $19.99 |
| Rating | [4.7 (12 ratings)](https://appshunter.io/ios/app/harmonicer/id6468485333/reviews) | **[4.8 (33 ratings)](https://appshunter.io/ios/app/prism-midi-sequencer/id6502302630/reviews)** |
| Number of ratings | 12 | **33** |
| Positive reviews | 80.0% of reviews | **85.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 23 MB | 55 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Tyler Quatraro](https://appshunter.io/developer/1724470298) |

## What reviewers say

### Harmonicer

[App page](https://appshunter.io/ios/app/harmonicer/id6468485333)

This app generates musical inspiration by combining MIDI quantization, harmonization, and arpeggiation. It offers extensive scale support and allows for the creation of complex chords and rhythmic patterns to enhance musical compositions.

**Highlights:** MIDI Quantizer with 20+ scales, Custom scale support, Harmonizer with up to 4 voices, Arpeggiator with 10 modes, Process MIDI from any source, Standalone use with internal keyboard

**Features:** Vision Pro support

**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 Harmonicer free?

Harmonicer costs $7.99, 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, Harmonicer or Prism MIDI Sequencer?

Prism MIDI Sequencer is rated higher. Harmonicer averages 4.7 out of 5 from 12 ratings, while Prism MIDI Sequencer averages 4.8 from 33 ratings.

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

Neither Harmonicer nor Prism MIDI Sequencer shows ads.

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

Harmonicer ships an update every 4 days, and Prism MIDI Sequencer every 2 weeks. Most recently, Harmonicer was updated on September 17, 2026 and Prism MIDI Sequencer on September 21, 2026.

---

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