# MuSA_RT vs PitchSetCalc

The clearest difference is review sentiment: PitchSetCalc at 50% against MuSA_RT's 0%. MuSA_RT's advantage is price (Free vs $0.99) and rating (5.0 vs 3.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

MuSA_RT is free to download; PitchSetCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MuSA_RT holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews complicate that: 0% of MuSA_RT's written reviews are positive against 50% of PitchSetCalc's, so the app with the better star average is not the one people write more warmly about.

MuSA_RT ships an update every 3 months, PitchSetCalc every 19 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | MuSA_RT | PitchSetCalc |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/musa-rt/id506866959/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/pitchsetcalc/id884187756/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Monetization | **Free** | Paid |
| Size | 3 MB | 36 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexandre Francois](https://appshunter.io/developer/506866962) | [Jess Hendricks](https://appshunter.io/developer/884187759) |

## 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


### PitchSetCalc

[App page](https://appshunter.io/ios/app/pitchsetcalc/id884187756)

This music theory tool aids students and theorists in analyzing music using Set Theory. It calculates normal order, prime form, Forte number, and interval class vectors from user-inputted pitch class sets. The app also offers audio playback of entered sets as scales or simultaneities.

**Highlights:** Pitch class set entry via pitch wheel, Calculates normal order, Calculates prime form, Calculates Forte number, Calculates interval class vector, Audio playback of pitch sets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MuSA_RT free?

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

### Is PitchSetCalc free?

PitchSetCalc costs $0.99, with no in-app purchases.

### Which has better reviews, MuSA_RT or PitchSetCalc?

MuSA_RT is rated higher. MuSA_RT averages 5.0 out of 5 from 1 ratings, while PitchSetCalc averages 3.5 from 2 ratings.

### Do MuSA_RT or PitchSetCalc have ads?

Neither MuSA_RT nor PitchSetCalc shows ads.

### Which is updated more often, MuSA_RT or PitchSetCalc?

MuSA_RT ships an update every 3 months, and PitchSetCalc every 19 months. Most recently, MuSA_RT was updated on November 1, 2026 and PitchSetCalc on November 1, 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.*