Enter notes to calculate intervals instantly! Learn intervals musically with Theory, Interval Quizzes & Ear Training—all in one app.
Intervals are a core part of music theory. By understanding the concepts and practicing consistently, anyone can build a solid foundation in music. This app is divided into four areas—Interval Theory, Interval Calculator, Interval Test, and Interval Ear Training—with each area offering focused, specialized learning.
• Interval Theory
The theory section explains interval numbers (2nd, 3rd, etc.), simple and compound intervals, harmonic and melodic intervals, inverted intervals, and interval calculation in a clear, structured way—so anyone can understand the underlying principles with ease.
• Interval Calculator
Once you understand the theory, try calculating intervals yourself. When you place two notes on a staff, the interval name is calculated and displayed instantly. The same notes are also shown on a piano keyboard, helping you understand intervals more intuitively. You can also set key signatures and clefs to calculate more complex intervals with ease.
• Interval Test
You can choose options such as key signatures, accidentals, staff types, and clefs to create the kinds of interval questions you want. Build your skills by solving problems like a game—the tougher the options and the higher your score, the more dazzling the fireworks, giving you a strong sense of achievement.
• Interval Ear Training
It’s essential to recognize the unique “color” of each interval by ear. With practice, you can sharpen your listening skills. Choose relative or absolute pitch, melodic or harmonic intervals, difficulty level, and playback speed to create your own personalized ear-training sessions.
• Interval Sight-Singing
On the Interval Calculator screen, you can practice interval sight-singing by playing two notes one after another. Set the interval between the two notes to 2 seconds. After hearing the first note, imagine the pitch of the second note in your mind and sing it aloud. Then compare your own pitch with the note that actually plays to improve your ear and sense of pitch.
The developer of this app has experience teaching students in a university music department. Drawing on that experience, the app was designed to help you understand music theory in a musical and practical way. We hope it will be a valuable resource for your musical journey.
Wow, this is ridiculous. I would give zero stars if I could:I paid for the upgrade to the app, but never received the upgrade. I called Apple and they said I have to contact the developer. Ookaaay, but the page in the App Store has no way to contact the developer.Apple says they can’t contact the developer. Ummmm, you communicated with them when you received the app from the developer, right? You communicated with the developer when you negotiated price and terms, right? Or did the app just magically appear in the App Store?Since Apple manages purchases and upgrades directly with the consumer, shouldn’t there be a way for them to trigger the upgrade? Is it that they are too lazy to try to truly help the customer…Or maybe too cost conscious, or incompetent?Definitely not the business model upon which Apple was founded.It’s too bad because the basic app is quite good, but very limited.
Developer Response
Our support contact has always been listed on the app's page, and we have no record of this issue being reported to us. Anyone experiencing an upgrade issue is welcome to contact us directly with their purchase details.
* In the Interval Calculator, fixed an issue where accidental spacing appeared uneven for a unison with accidentals on both notes when the 'Chord' playback setting was selected.
* Harmonic Interval Ear Training has been improved to support not only half notes, but also quarter, eighth, and sixteenth notes.
* The app name has been changed from "Interval Test" to "Interval Calculator & Quiz."
Version 5.9.85
The developer, HEE GWANG KIM, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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The following data may be collected but it is not linked to your identity:
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The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
HEE GWANG KIM
Size
43 MB
Category
Education
Compatibility
Requires iOS 13.0 or later.
iPhone Requires iOS 13.0 or later.
iPad Requires iPadOS 13.0 or later.
iPod touch Requires iOS 13.0 or later.
Mac Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
Languages
English and 9 more
English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
