Comparison

MuSA_RT vs MIDI FX

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

Head to head
About

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.

Highlights
  • 3D tonality visualization
  • Audio analysis for pitch and context
  • Chord and key identification
  • Augmented Reality mode
  • Smooth camera rotation for unobstructed views
Read full description

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.

About

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.

Highlights
  • MIDI signal processing
  • Harmonize and Transpose
  • Sequencer for synths
  • Delay and Looper
  • Filter notes by velocity
  • Internal instruments
Features
Read full description

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

MuSA_RT2 screens
MIDI FX2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. MIDI FX sells 1 one-off in-app purchase. MuSA_RT asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
MuSA_RT versus MIDI FX: the parameters behind the verdict, then further details
ParameterMuSA_RTMIDI FX
PriceFreeFree
Rating5.0 (1 ratings)5.0 (5 ratings)
Positive reviews0.0% of reviews—
Number of ratings15 — better
Update frequencyEvery 3 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Mac
Requires iOS15.614.7 — better
Further details — not scored
Size3 MB263 MB
Age rating4+4+
DeveloperAlexandre FrancoisJorge Arroyo

Customer experience

MuSA_RT

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

MIDI FX

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

MuSA_RT

No in-app purchases

1 purchases

MIDI FX

One-time1
  • Unlock app$9.99

Questions

Is MuSA_RT free?
MuSA_RT is free to download, with no in-app purchases.
Is MIDI FX free?
MIDI FX is free to download, with in-app purchases available.
Which has better reviews, MuSA_RT or MIDI FX?
MuSA_RT and MIDI FX are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.
Do MuSA_RT or MIDI FX have ads?
Neither MuSA_RT nor MIDI FX shows ads.
Which is updated more often, MuSA_RT or MIDI FX?
MuSA_RT ships an update every 3 months, and MIDI FX every 9 days. Most recently, MuSA_RT was updated on November 1, 2026 and MIDI FX on November 3, 2026.

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