MuSA_RT vs MIDI FX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MuSA_RT
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.
- 3D tonality visualization
- Audio analysis for pitch and context
- Chord and key identification
- Augmented Reality mode
- Smooth camera rotation for unobstructed views
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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.
MIDI FX
This app allows you to control and process MIDI signals for music creation. It offers features like harmonization, transposition, and sequencing, enabling you to control external or virtual synthesizers and create complex musical arrangements.
- MIDI signal processing
- Harmonize and Transpose
- Sequencer for synths
- Delay and Looper
- Filter notes by velocity
- Internal instruments
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Buy once and get the iOS and Mac apps (with Family Sharing) Control your MIDI signals and process them in any combination of ways: Harmonize, Transpose, Arpeggiate, etc... Or use the Sequencer to play any external or virtual synth. Use a MIDI interface to unlock the power of the app to control multiple synths with one keyboard, play one note and generate chords, basslines, etc... Use the delay/looper or filter notes based on velocity or other parameters to send to different synths/effects. A MIDI workstation in your pocket (or your iPad/Mac) You can also use some internal instruments (drums sampler, piano or synth) if you are away from your MIDI gear, and sequence whole songs inside the app, or use other synth apps as input/output for MIDI FX. Your imagination is the limit!
Screenshots
Verdict
The clearest difference is in-app purchases: MuSA_RT at none against MIDI FX's 1. MIDI FX's advantage is update cadence (every 9 days vs every 3 months) and ratings volume (5 vs 1). On price, rating, ads and monetization model 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
Both are free to download. MIDI FX sells 1 one-off in-app purchase. MuSA_RT asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for MuSA_RT against 5.0 for MIDI FX. That said, the two scores are not equally well evidenced: MIDI FX has 5 ratings behind it against 1, so its average is the more settled of the two.
MuSA_RT ships an update every 3 months, MIDI FX every 9 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | MuSA_RT | MIDI FX |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (5 ratings) |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 3 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Requires iOS | 15.6 | 14.7 — better |
| Further details — not scored | ||
| Size | 3 MB | 263 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexandre Francois | Jorge Arroyo |
Customer experience
MuSA_RT
MIDI FX
In-app purchases
MuSA_RT
No in-app purchases
MIDI FX
- Unlock app$9.99









