Comparison

MuSA_RT vs ScaleMaster Pro

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

ScaleMaster Pro

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
Read full description

Just started piano lessons? Or maybe you picked up that cool looking headless guitar from an auction site and surprise, it's a baritone and in D! Or perhaps you've been playing violin for a while, but that new piece has you wondering about the harmonic minor scale. And if you picked up a mandolin this time instead of yet another guitar, you certainly want to see how your favorite pentatonic is played on that slim fretboard. Starting out can be rough, but learning continues as our interests evolve and that is fantastic. ScaleMaster is your go-to companion for learning scales on your instrument, and no matter how we look at it, scales will remain an essential part of our musical journey as beginners or professionals. Seeing any scale in music notation and on your instrument at the same time is pretty cool. No need to translate between the two. The notation shows you what to play, and your instrument shows you where your fingers go. Whether you're just starting out or need a quick reference, it's all right there. As you practice, you'll want to speed things up, slow them down. Maybe you've got your fingers organized after a couple weeks of working that harmonic minor mode, or you're working through a tricky passage. Adjust the tempo and keep pushing yourself. Save your scales too, that E Blues scale you've been working on, the exercises for your band's repertoire, or the scales you're exploring for that chord progression that keeps showing up. Each scale document remembers your instrument and where you left off. And that includes positions because for some of us an F Mixolydian scale looks very different in 5th position than it does in 3rd. But as for help with improvising, this is where ScaleMaster really shines. That Bbm7b5 chord keeps coming up, and you're tired of that same old scale. So, find the scales that work. Hear how they sound, and flip back and forth between different possibilities until something clicks. It's not about memorizing every scale, it's about discovering the ones that speak to you and expanding your vocabulary when you need it. If you're a pianist, you get a full 88-key interface. Guitar players get the 24 frets they want. String players can set custom tunings, that detuned E string on your violin, your new five-string banjo, or that Open D tuning for that one song. And when you're ready to work on reading music, switch clefs and practice with the same scales you know by ear. It all connects. • Over 200 scales from around the world • Scale visualization for your instrument in music notation and schematic • Reference instruments: piano, guitar, bass, banjo, mandolin, violin, viola, cello, double bass • Scale documents recording instrument, position and more for current and future reference • Universal transposition of any scale or exercise • All common clefs for reading practice • Dozens of tuning presets There are two main pillars to ScaleMaster Pro - reference and play. Finding good scale options for that old major chord is one thing, evaluating their sound another. For that you can generate scale patterns, change their tempo, key and sound to get a taste for what fluency would get you. Reference - as in reference instruments, alternate tunings, sound and notation alternatives and more. Playing along on the other hand is foremost excellent practice. You can slow things down or crank up the speed - ScaleMaster shows you where the notes are and play along if you want it to. Scales are a central topic for us musicians with many periods of interest. For a while we're into pentatonics but then get caught up in blues scales, church modes, exotic scales and more. ScaleMaster helps keep track and lets you sound things out.

Screenshots

MuSA_RT2 screens
ScaleMaster Pro4 screens

Verdict

The call

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.

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

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
MuSA_RT versus ScaleMaster Pro: the parameters behind the verdict, then further details
ParameterMuSA_RTScaleMaster Pro
PriceFree — better$4.99
Rating5.0 (1 ratings) — better—
Positive reviews0.0% of reviews41.7% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS15.6 — better26.0
Further details — not scored
Size3 MB167 MB
Age rating4+12+
DeveloperAlexandre FrancoisRoGame Software

Customer experience

MuSA_RT

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

ScaleMaster Pro

Written reviews12 reviews
Positive41.7%
Neutral8.3%
Negative50.0%

In-app purchases

None

MuSA_RT

No in-app purchases

None

ScaleMaster Pro

No in-app purchases

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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