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Scales are central to music. Intervals are central to scales. Tuning intervals is a complex process that must constantly be refined by the musician.

Scale Master was designed by professional musicians and educators and developed by experienced software consultants and is a tool providing transparency to intonation deficiencies so that tuning is faster and more accurate.

Through the use of "droning" sounds across various intervals, Scale Master provides a means of practicing intonation.

Who can use Scale-Master?

- Musicians (Professional and Amateur) striving to further perfect their tuning ability
- Student Musicians just starting to come to grips with the challenges of Just Intonation within the ensemble
- Band, Orchestra and Choral Directors looking for a way to help their ensembles "HEAR" what "In Tune" is
- Music Theory, Music Appreciation and General Music teachers wanting to demonstrate scales, intervals, patterns and intonation

How it works:

Using Equal Tempered tuning, select a root pitch and octave, then select the scale interval above the root pitch and select "Play". The generated droning sound will be a real-time interval based on Just Intonation producing the greatest resonance.

There are a total of 780 droning renderings available for the first release.

Beyond simple drones, you can also select a scale mode to display. The corresponding intervals will be high-lighted allowing easy, visual recognition of scale patterns. Scales included are:

- Chromatic
- Major
- Natural Minor
- Harmonic Minor
- Blues
- Whole Tone
- Major Pentatonic
- Minor Pentatonic

There is also a scale "Auto-Play" function that will play the droning root and the corresponding scale interval in half notes at quarter=60bpm allowing the musician to work with tuning and harmonizing in real-time.

There are a total of 420 scale configurations available for the first release.

What Others are Saying:

"I think your app will be widely useful, better and more convenient than the typical tuner. It also will be a good companion tool for users of my 'Breakfast' Intonation practice booklet."
David Schwartz

"This new app looks wonderful to me, Gil!! A great teaching tool not only for trombonists but also for music theory and many more applications for musicians. Great idea!!"
Tom Senff - Trombone Professor and Trombonist with Stan Kenton Orchestra

"WOW! I like this a great deal. I teach AP Music theory. I think this would be tremendously helpful with drilling intervals."
Rob Optiz - High School Band Director

"When my students use this, they seem to adjust automatically in the correct direction."
Private Trombone Instructor

What’s New

Version 1.81

Minor internal tweaks...more coming soon.

Ratings and Reviews

Best metronome app ,

Excellent APP For scale practice

Really love it. Please add multi-octave scales!

LugubriousLemur ,

Every Musician Must Have and Use This

We teach and learn about the physical properties of sound waves and how they combine. We teach and learn about good intonation and how music can really come alive when it is in tune. Then we practice are scales to a piano, guitar, or chromatic tuner for thousands of hours in the practice room - essentially drilling out of our heads all the correct stuff we learn. We think that "perfect" pitch is correct …

The scale master app is the right tool to train your ear whether you are a vocalist in an a cappella ensemble, a trombone player, or conducting an orchestra (and everything else too). Listen to correct intervals. Practice playing the right "major third above C". Make your music better with Scale Master.

Drake Domingue ,


By far the best, most advanced drone machine available in the app store. And for free?! Most drone CDs cost around $10!

This is great for students at any level, and truly gets a great workout for anyone! I have essentially put away my $80 tuner/met and pulled out my old $5 metronome because the intonation workout this offers is invaluable to live performance.

There are a few things I hope can be offered at some point:

1) Having the ability for the drone to play for an allotted amount of time (120 seconds, or 32, 4/4 measures at 80bpm, etc)

2) A button to go up or down by half step. I know that each pitch has its own button (and I love this!), but many of the exercises I do only allow for one measure of rest before it goes up or down the half step, so having a button rather than searching for the letter would be awesome!

Once again, a great app!


Gil Estes
13.2 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Gil Estes (c) 2012
In-App Purchases
  1. Jazz Modes $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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