# MuSA_RT vs ScaleMaster Pro

The clearest difference is price: MuSA_RT at Free against ScaleMaster Pro's $4.99. MuSA_RT also leads on iOS requirement (15.6 vs 26.0). ScaleMaster Pro's advantage is review sentiment (42% vs 0%). On update cadence, ads, in-app purchases and device support there is nothing between them.

MuSA_RT is free to download; ScaleMaster Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MuSA_RT ships an update every 3 months, ScaleMaster Pro every 2 months. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | MuSA_RT | ScaleMaster Pro |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/musa-rt/id506866959/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | **41.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 3 MB | 167 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 12+ |
| Developer | [Alexandre Francois](https://appshunter.io/developer/506866962) | [RoGame Software](https://appshunter.io/developer/285831223) |

## What reviewers say

### MuSA_RT

[App page](https://appshunter.io/ios/app/musa-rt/id506866959)

This app visualizes music tonality in 3D using advanced algorithms. It analyzes audio from your microphone to identify chords and keys, displaying them with a rotating camera or in augmented reality.

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

**In-app purchases:** none


### ScaleMaster Pro

[App page](https://appshunter.io/ios/app/scalemaster-pro/id1163225590)

Learn musical scales on your instrument with visual aids and adjustable tempo. Explore different scales, save your practice sessions, and discover new sounds for improvisation. Adapts to various instruments and tunings.

**Highlights:** Learn scales in notation and on instrument, Adjustable tempo for practice, Save custom scale documents, Support for piano, guitar, bass, and more, Custom tunings, All common clefs for reading practice, Scale transposition

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is MuSA_RT free?

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

### Is ScaleMaster Pro free?

ScaleMaster Pro costs $4.99, with no in-app purchases.

### Do MuSA_RT or ScaleMaster Pro have ads?

Neither MuSA_RT nor ScaleMaster Pro shows ads.

### Which is updated more often, MuSA_RT or ScaleMaster Pro?

MuSA_RT ships an update every 3 months, and ScaleMaster Pro every 2 months. Most recently, MuSA_RT was updated on November 1, 2026 and ScaleMaster Pro on November 11, 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.*