Enter notes to calculate intervals instantly! Learn intervals musically with Theory, Quizzes & Ear Training—all in one app.
Clear interval theory and an intuitive interval calculator.
Then practice with interval quizzes and ear training like a game—instant feedback, scores, and fireworks.
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 categories—Interval Theory, Interval Calculator, Interval Quiz, and Interval Ear Training—offering focused learning in each area.
• 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 Quiz
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.
The developer of this app has experience teaching music students at the university level. 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
I’m sorry for the inconvenience. Apple handles all payments, and occasionally purchases don’t sync.Please tap “Restore Purchases” or contact me at hg-music@naver.com and I’ll resolve it quickly.
* Wrong-answer explanations have been added to Interval Quizzes. Now, even if you get a question wrong, you can easily see why.
* At Level 1, both the abbreviation and the full interval name are shown. At Level 2 and above, only the interval abbreviation (P/M/m/A/d) is shown.
Version 5.9.0
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 .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Purchases
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
HEE GWANG KIM
Size
47.5 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.
