Comparison

CalmusNotation vs Chord Roulette

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CalmusNotation

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
Read full description

Graphical Notation is an app for music creation and graphical notation using Artificial Intelligence. The coreof Graphical Notation is the CalmusAI brain where the modern composing methods are programmed into the brain using Lisp programming language. NASA has historically used Lisp for artificial intelligence and autonomous systems, most notably in the 1990s Remote Agent project, the first AI system to control a spacecraft. CalmusNotation does not collect or use any musical material from the internet but creates new music based on the input from the user. In addition - CalmusNotation can also receive composed music from CalmusComposer and CalmusPlay - and present the music as graphical notation for live performance - in real-time. CalmusComposer composes music with Artificial Intelligence and can send the musical result to GraphicalNotations to be presented for life performance. CalmusComposer is connected to GraphicalNotation through WiFi local network - by selecting CalmusNotation in Settings. GraphicalNotation is connected to CalmusComposer, through WiFi local network - by selecting the MacOS device in the settings of GraphicalNotation. CalmusNotation needs Internet connection.

About

Chord Roulette

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
Read full description

Welcome to Chord Roulette, your gateway to boundless musical creativity. Chord Roulette is an AUv3 MIDI plugin that takes a single MIDI note and transforms it into a mesmerizing array of harmonious chords, offering an infinite realm of possibilities for generative music composition. Key Features: - Chord Generation Mastery: Instantly convert a single MIDI note into a rich tapestry of harmonically intricate chords, exploring scales and tonalities effortlessly. - Automation at Your Fingertips: Every parameter within Chord Roulette is automation-ready, granting you meticulous control over your compositions. - Generative Magic: Witness your musical ideas evolve and expand organically, giving birth to fresh and captivating compositions with minimal effort. - Scale Selection Flexibility: Choose from a diverse array of scales, modes, and tonalities to craft the perfect musical atmosphere. - Real-Time Precision: Fine-tune your chord progressions and melodies on the fly, ensuring each note aligns perfectly with your vision. - AUv3 Compatibility: Seamlessly integrate Chord Roulette into your preferred iOS DAWs, offering complete creative control. With Chord Roulette, you possess the ultimate tool to compose generative music that reflects your unique artistic vision. Whether you're a composer, producer, or performer, our plugin empowers you to craft musical journeys that captivate and inspire. Unleash your musical imagination. Download Chord Roulette now and embark on an endless voyage of generative music composition!

Screenshots

CalmusNotation4 screens
Chord Roulette1 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
CalmusNotation versus Chord Roulette: the parameters behind the verdict, then further details
ParameterCalmusNotationChord Roulette
PriceFree — better$0.99
Rating4.4 (5 ratings) — better4.3 (20 ratings)
Positive reviews0.0% of reviews71.4% of reviews — better
Number of ratings520 — better
Update frequencyEvery 4 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.615.6
Further details — not scored
Size294 MB3 MB
Age rating4+4+
DeveloperErki-tonlist sfDenis Safiullin

Customer experience

CalmusNotation

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

Chord Roulette

All ratings20 ratings
Positive85.0%
Neutral0.0%
Negative15.0%
Written reviews21 reviews
Positive71.4%
Neutral0.0%
Negative28.6%

In-app purchases

None

CalmusNotation

No in-app purchases

None

Chord Roulette

No in-app purchases

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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