Interval Test · Music Theory v5.1.0

Intervals are the foundation of music theory.
Accurate understanding and consistent practice are essential for real progress.

Since 2020, this app has provided visual interval calculation on the staff, notation-based exercises, and ear training in one place.
At the time, it was one of the few apps on Google Play offering a notation-centered approach to interval training, and it has been loved by many music majors and performers ever since.

From interval calculation and theory study to ear training and unlimited practice questions,
this app is designed as an essential tool to help music students and performers build a solid foundation.

📏 Visual Interval Calculation

A unique interface that shows staff notation and piano keyboard together helps you understand intervals intuitively.

Visual learning: See the distance between two notes directly on the staff and keyboard, and internalize interval structures naturally.

Instant feedback: As you enter or move notes, the interval is calculated and displayed immediately.

Standard notation: Uses common abbreviations such as P, M, m, aug, dim, making it suitable for formal music theory study.

🖋 Unlimited Interval Exercises

Thanks to the built-in random generation system, you get new interval questions every time.

Unlimited practice: There is no limit to the number of questions, so you can practice as much as you like.

Gradual difficulty levels: Choose from basic to advanced levels; higher levels include more complex accidentals and challenging patterns.

Self-directed learning: When you are unsure, use the hints on the keyboard to count semitones and work out the answer yourself.

Motivating feedback: Visual rewards (such as a fireworks animation) celebrate perfect scores and keep practice enjoyable.

📙 Comprehensive Interval Theory Guide

All the essential theory about intervals is organized in one place—from basic concepts to commonly confusing advanced topics.

Simple vs. compound intervals

Harmonic vs. melodic intervals

Inversions

Semitone counting

Enharmonic intervals, and more

Even without a separate theory textbook, you can learn what you need directly inside the app.

👂 Interval Ear Training

The app is designed so that theory and ear training grow together.

Ear training: Listen to each interval played on a keyboard sound and get used to its unique character.

Better musical sense: By combining calculation drills with ear training, both your analytical understanding and your musical intuition improve side by side.

👨‍🏫 About the Developer

The developer studied composition at Hanyang University (B.A. and M.A.)
and has taught composition and music theory as an adjunct professor in the Department of Performing Arts at Paichai University.

Based on years of experience working with music majors, entrance exam students, and performers,
this app was designed as a practical tool that integrates notation-based interval study with ear training in a single, focused environment.

✨ Who this app is for
University music majors and conservatory students

Prospective music and contemporary music students

Classical and jazz performers

Anyone studying composition, arranging, or music theory seriously

With this app, you can build a solid foundation in intervals in one place.
The notation-based, visual interface and endlessly repeatable question system help you feel your learning speed noticeably increase.

🙏 Attribution
This app uses "Free Stars Animation" by Bertina on LottieFiles.