# MuSA_RT — Tonality 3D visualization + AR

> 3D music tonality visualization with AR capabilities. (iPhone/iPad app by Alexandre Francois.)

- Source: https://appshunter.io/ios/app/musa-rt/id506866959 (this page in markdown: same URL + `.md`)
- Developer: [Alexandre Francois](https://appshunter.io/developer/506866962)
- Category: Music, Education
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 3 MB
- Languages: American English
- Released: 2012-07-02
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/musa-rt/id506866959/reviews.md

## What is MuSA_RT?

MuSA_RT applies music analysis algorithms rooted in Elaine Chew’s Spiral Array model of tonality, which also provides the 3D geometry for the visualization space. The app analyzes the audio signal received from a microphone to determine pitch names, maintain short term and longterm tonal context trackers, each a Center of Effect (CE), and compute the closest triads (3-note chords) and keys as the music unfolds in performance.
The 3D view presents a graphical representations of these tonal entities in context, smoothly rotating the virtual camera to provide an unobstructed view of the current information. These graphics can also be visualized in an experimental Augmented Reality mode on compatible devices.

## Key features

- 3D tonality visualization
- Audio analysis for pitch and context
- Chord and key identification
- Augmented Reality mode
- Smooth camera rotation for unobstructed views

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/musa-rt/id506866959/reviews.md

### 1/5 — DOESNT WORK

*2017-12-03*

DOESNT WORK, DOES THIS ONLY SUPPORT MUSART INPUT?

### 3/5 — Great Idea But Cannot Use

*2012-11-06*

I love the idea of this app, and it looks visually appealing. The only thing is that it does not accept input from any source other than MIDI. I don't have any way (that I know of) to make the app "listen" to mic input, either internal or external, on my Mac. Alexandre, I hope you might consider adding the ability for it to listen to mic inputs also.

## Frequently asked questions about MuSA_RT

### What is MuSA_RT?

MuSA_RT is a free music application that visualizes tonality in 3D and Augmented Reality. It analyzes audio input to identify chords and keys as music plays.

### How does MuSA_RT visualize music?

It uses Elaine Chew's Spiral Array model to create a 3D graphical representation of tonal entities, with a smoothly rotating camera for clear viewing.

### Can I use MuSA_RT in Augmented Reality?

Yes, MuSA_RT offers an experimental Augmented Reality mode on compatible devices, allowing for an immersive visualization experience.

### What devices support MuSA_RT?

MuSA_RT is supported on Mac, iPhone, iPad, and iPod devices.

### Is MuSA_RT suitable for all ages?

Yes, MuSA_RT has an age rating of 4+, making it suitable for a wide range of users.

### How often is MuSA_RT updated?

The latest version, 3.1.0, was released on November 20, 2024, indicating active development and updates.

### Does MuSA_RT have ads?

No, MuSA_RT does not contain advertisements.

### What is the user feedback on MuSA_RT?

MuSA_RT has received a perfect rating of 5.0 stars from one review, suggesting a highly positive user experience.

## Version history (last 5 releases)

### 3.1.0 — 2024-11-20

This version introduces:
  - audio file input
  - streaming of analysis data to/from other MuSA_RT instances
  - UI tweaks and a modernized logo

### 3.0.0 — 2024-05-21

Graphics entirely rewritten with RealityKit for a sleeker look. This also opens the door for MuSA_RT in VisionOS!

### 2.2.0 — 2023-12-29

Back by popular demand, MIDI input!

### 2.1.0 — 2023-12-02

- Fixed a bug that mislabelled minor keys
- Adopted standard switches in settings screens

### 2.0.3 — 2021-01-27

Bug fixes and UI tweaks.

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## More apps by Alexandre Francois

- [Priorities-Sorted](https://appshunter.io/ios/app/priorities-sorted/id1469567351)
- [Oscillators](https://appshunter.io/ios/app/oscillators/id1641353759)
- [Purr – Soothe Your Screen Time](https://appshunter.io/ios/app/purr-soothe-your-screen-time/id6745490370)
- [BreathWheel](https://appshunter.io/ios/app/breathwheel/id6746683143)

All apps by Alexandre Francois: https://appshunter.io/developer/506866962

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*