Interval Test · Music Theory

HEE GWANG KIM

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About this app

Intervals are the foundation of music theory. Accurate understanding and consistent, repeated practice build real skill. Since January 2020, this app has been a comprehensive learning tool that brings together staff-based interval calculation, sheet-music style interval exercises, and interval ear training—all in one place. By adopting a then-rare “score-based interval learning approach,” it has been consistently used and trusted by music majors and performers.

📏 Interval Calculator
When you enter two notes on the staff, the same notes are highlighted on a piano keyboard, helping you understand interval calculation more intuitively.
The app also shows interval abbreviations (P, M, m, A, d) and indicates whether the interval is simple or compound, making it easy to learn different notation systems.
You can also calculate intervals with key signatures and clefs applied.

🖋 Interval Exercises
You can freely choose options such as key signatures, accidentals, staff type, difficulty level, and clefs to build the kind of interval questions you want. With the app’s unique random generation system, you can always practice new, fresh interval problems.
When a question feels challenging, you can refer to the notes shown on the keyboard and count semitones yourself to work out the answer.
The higher your score with more advanced options, the more dazzling the fireworks animations—making practice even more enjoyable.

👂 Interval Ear Training
Rather than simply memorizing intervals, it’s important to understand the unique “color” of each interval musically. You can create your own personalized ear-training sessions by choosing relative pitch or absolute pitch, melodic or harmonic intervals, difficulty level, and playback speed. As the level increases, the questions become more challenging.

📙 Interval Theory
If you want to understand interval concepts easily, we recommend starting with the theory section. Intervals actually work on a surprisingly simple principle.
Core topics—such as interval numbers, simple vs. compound intervals, harmonic vs. melodic intervals, inverted intervals, semitone calculation, and enharmonic relationships—are explained step by step in a clear and accessible way, so anyone can grasp the underlying logic.

👨‍🏫 About the Developer
The developer has taught composition, harmony, and music theory at the university level. Drawing on real challenges encountered while working with music majors, entrance exam students, and performers, this app was designed as a practical tool for practicing score-based interval skills and ear training in one place.

✨ Recommended For
Music university / arts high school / practical music majors
Practical music entrance exam applicants
Classical / jazz performers
Composers, arrangers, and anyone who wants to study music theory systematically

We hope this app becomes a valuable help in your music studies. Thank you.

What’s new

* Supports 8 languages: English, Spanish, Portuguese, Korean, Japanese, Chinese, French, German.
* Gradual difficulty increase: Highest levels now feature triply diminished/augmented intervals (Interval Test) and compound intervals (Ear Training).
* Added auto-repeat playback to interval ear-training.
* Plus various other improvements.