# CalmusNotation vs Chord Roulette

CalmusNotation and Chord Roulette both sit at 4.4 stars, but that hides the real split: 71% of Chord Roulette's written reviews are positive against 0% of CalmusNotation's. Chord Roulette also leads on update cadence (every 3 days vs every 4 months) and ratings volume (20 vs 5). CalmusNotation's advantage is price (Free vs $0.99). On rating, ads, in-app purchases and device support there is nothing between them.

CalmusNotation is free to download; Chord Roulette costs $0.99 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 — 4.4 for CalmusNotation against 4.3 for Chord Roulette. Both are backed by a comparable volume of ratings — 5 and 20 respectively. Written reviews are what separate them: 0% of CalmusNotation's written reviews are positive against 71% of Chord Roulette's.

CalmusNotation ships an update every 4 months, Chord Roulette every 3 days. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | CalmusNotation | Chord Roulette |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.4 (5 ratings)](https://appshunter.io/ios/app/calmusnotation/id993026661/reviews)** | [4.3 (20 ratings)](https://appshunter.io/ios/app/chord-roulette/id6470079737/reviews) |
| Number of ratings | 5 | **20** |
| Positive reviews | 0.0% of reviews | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | **Free** | Paid |
| Size | 294 MB | 3 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Erki-tonlist sf](https://appshunter.io/developer/929321904) | [Denis Safiullin](https://appshunter.io/developer/1840438643) |

## What reviewers say

### CalmusNotation

[App page](https://appshunter.io/ios/app/calmusnotation/id993026661)

Create and visualize musical compositions using AI-powered graphical notation. This app leverages advanced AI, inspired by NASA's Lisp programming, to generate original music based on user input and can display music from other compatible apps for live performance.

**Highlights:** AI-powered music composition, Graphical notation display, Real-time performance visualization, Lisp-based AI engine, User input-driven music creation, Integration with CalmusComposer and CalmusPlay

**In-app purchases:** none


### Chord Roulette

[App page](https://appshunter.io/ios/app/chord-roulette/id6470079737)

This AUv3 MIDI plugin transforms a single MIDI note into a wide range of harmonious chords, enabling generative music composition. It offers extensive control over parameters, scales, and real-time adjustments for creative musical exploration.

**Highlights:** Chord generation from single MIDI notes, Automation-ready parameters, Generative music composition, Diverse scale and mode selection, Real-time precision adjustments, AUv3 compatibility for DAWs

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CalmusNotation free?

CalmusNotation is free to download, with no in-app purchases.

### Is Chord Roulette free?

Chord Roulette costs $0.99, with no in-app purchases.

### Which has better reviews, CalmusNotation or Chord Roulette?

CalmusNotation is rated higher. CalmusNotation averages 4.4 out of 5 from 5 ratings, while Chord Roulette averages 4.3 from 20 ratings.

### Do CalmusNotation or Chord Roulette have ads?

Neither CalmusNotation nor Chord Roulette shows ads.

### Which is updated more often, CalmusNotation or Chord Roulette?

CalmusNotation ships an update every 4 months, and Chord Roulette every 3 days. Most recently, CalmusNotation was updated on October 8, 2026 and Chord Roulette on October 13, 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.*