# Interval Test — Music Theory & Ear Training

> Music theory and ear training app for learning and practicing musical intervals. (iPhone/iPad app by HEE GWANG KIM.)

- Source: https://appshunter.io/ios/app/interval-test/id1576148862 (this page in markdown: same URL + `.md`)
- Developer: [HEE GWANG KIM](https://appshunter.io/developer/1560438473)
- Category: Education, Music
- Price: Free with in-app purchases
- Rating: 4.40/5 from 7 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 40 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2021-10-14
- Data updated: 2026-07-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/interval-test/id1576148862/reviews.md

## What is Interval Test?

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.

## Key features

- Interval theory explanations
- Intuitive interval calculator
- Customizable interval quizzes
- Personalized ear training sessions
- Instant feedback and scoring
- Visual representation on staff and piano

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Music Interval App Premium | $7.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/interval-test/id1576148862/reviews.md

### 1/5 — Bogus billing/Can’t upgrade/Do NOT buy!!

*2024-02-17*

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.

### 5/5 — 아이패드

*2023-07-14, version 1.2*

아이패드에서는 다운이 안되나요? 
검색해도 안나오네요

### 5/5 — 음정 연습하기 좋아요

*2023-03-25, version 1.2*

근데 문제 풀때 소리 안나게 할 수 있음 좋겠습니다
노래들으면서 문제 푸는데 자꾸 노래가 끊겨요 ㅠ

### 5/5 — 기능 추가해주세오

*2022-03-26, version 1.2*

조 기능도 추가해줘서 AM 에서 일일히 파도솔 다 샵 누르는데 조 기능 꼭 추가해주세요! 그리고 악보 찍으면 인식 기능도 (어렵지만…) 해주시면 감사하겠습니다

## Frequently asked questions about Interval Test

### What is Interval Test?

Interval Test is an educational app designed to help users learn music theory and practice ear training. It offers sections for understanding interval concepts, calculating intervals, taking quizzes, and engaging in personalized ear training exercises.

### How does Interval Test teach music theory?

Interval Test explains interval numbers, simple and compound intervals, harmonic and melodic intervals, and inverted intervals in a clear, structured manner. It also provides an interval calculator for hands-on practice.

### Can I customize the quizzes in Interval Test?

Yes, you can customize interval quizzes by selecting options such as key signatures, accidentals, staff types, and clefs. This allows for tailored practice to build specific skills.

### What kind of ear training does Interval Test offer?

Interval Test provides personalized ear training sessions where you can choose between relative or absolute pitch, melodic or harmonic intervals, difficulty levels, and playback speeds to sharpen your listening skills.

### Is Interval Test suitable for beginners?

Yes, the app is designed to be understandable for anyone, drawing on the developer's experience teaching music students. It aims to provide a musical and practical approach to music theory.

### What devices does Interval Test support?

Interval Test is available for iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users.

### How often is Interval Test updated?

The latest version of Interval Test is 5.9.0, and it was last updated on February 4, 2026. This indicates a commitment to ongoing development and improvements.

### Does Interval Test have ads?

No, Interval Test does not contain advertisements, allowing for an uninterrupted learning experience. It does offer in-app purchases for additional features or content.

## Version history (last 5 releases)

### 5.9.7 — 2026-07-24

We've completely replaced the sound engine for more accurate, cleaner piano playback, and resolved the click/pop noise issue that occurred on the latest iPhone models.
Fixed various minor bugs to improve overall stability.

### 5.9.6 — 2026-07-21

New Features
Added a Mistake Notebook feature — collect and retry interval questions and ear training items you got wrong.
Added a score trend graph on the score screen, showing your last 10 results.

Improvements
In Interval Ear Training, you can now choose to display the answer as notation or text, and check it with a single button.
Enlarged the keyboard in ear training questions for easier tapping.

Bug Fixes
Fixed an issue on some devices where audio would stop during Interval Ear Training, requiring an app restart.
Fixed an issue where the play button in Interval Ear Training was occasionally unresponsive to taps.

### 5.9.0 — 2026-02-04

* 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.

### 5.5.8 — 2026-01-23

• New questions have been added so you can test yourself immediately while learning interval theory.
• Improved the overall look and readability of the sheet music display.
• Refined the card side margins on the Interval Calculator and Interval Quiz screens for a cleaner layout.
• Added a fast score count-up animation when you achieve 100 points in the Interval and Ear Training quizzes.

### 5.5.0 — 2026-01-13

• Interval Quiz difficulty levels have been expanded from 1–4 to 1–5. The difficulty curve has been adjusted to increase more gradually.
• A Similar Intervals mode has been added to Ear Training. Practice by grouping and comparing intervals with a similar sound color (2nd·3rd, 6th·7th, 4th·5th).

## Apps similar to Interval Test

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [ABRSM Music Theory Trainer](https://appshunter.io/ios/app/abrsm-music-theory-trainer/id1415709055) | 3.7 (10) | $4.99 | Education |
| [Theta Music Trainer](https://appshunter.io/ios/app/theta-music-trainer/id791698217) | 3.5 (16) | Free | Education |
| [ChordProg Ear Trainer](https://appshunter.io/ios/app/chordprog-ear-trainer/id1454739512) | 4.3 (15) | Free | Education |
| [Notes! - Learn To Read Music](https://appshunter.io/ios/app/notes-learn-to-read-music/id423178140) | 4.4 (1,333) | $3.99 | Education |
| [soundbite - ear trainer](https://appshunter.io/ios/app/soundbite-ear-trainer/id6473090252) | 5.0 (1) | Free | Education |
| [Musical Ear - Ear Training](https://appshunter.io/ios/app/musical-ear-ear-training/id6504847203) | 4.7 (7) | Free | Education |

## More apps by HEE GWANG KIM

- [Ear Training Quiz](https://appshunter.io/ios/app/ear-training-quiz/id1562983098)

All apps by HEE GWANG KIM: https://appshunter.io/developer/1560438473

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-29.*