# KORG cortosia — GOOD SOUND TUNER

> Interactive tuner app analyzing and rating five elements of musical sound quality. (iPhone/iPad app by KORG INC..)

- Source: https://appshunter.io/ios/app/korg-cortosia/id952982019 (this page in markdown: same URL + `.md`)
- Developer: [KORG INC.](https://appshunter.io/developer/363714046)
- Category: Music, Education
- Price: $9.99
- Rating: 4.20/5 from 6 App Store ratings · 22 written reviews indexed
- Age rating: 12+
- Requires: iOS 12.0 · 35 MB
- Languages: American English, Japanese
- Released: 2015-01-21
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/korg-cortosia/id952982019/reviews.md

## What is KORG cortosia?

KORG cortosia, the tuner app that makes it enjoyable to practice the basics
Learn “good sound” and enjoy “good performance”!

*This app can evaluate only flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium performances.

(Operating Requirements)
iOS8 or later
iPhone 5 or later, iPod Touch 5th Generation or later

KORG has answered the question: “Can a tuner recognize good sound?” With the KORG cortosia you'll see what's missing from “good sound” with just a glance. Even practice that's slightly boring (such as practicing the production of single notes) will become enjoyable. The cortosia is  a completely new type of interactive tuner app designed to improve the overall quality of sound produced by the artist.

* Analyzes five elements of “good sound” and rates them in real time
* Automatically records “good sound” so you can check your daily improvement in technique
* Lets you compete against the world in “good sound” and vie for ranking
* Supports flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium

Analyze five elements of “good sound” and rate them in real time:
Just what is “good sound”? Beautiful sound, pleasant sound, sound that resonates in the listener's heart. Perceptions of “good sound” differ between people, but could there be some commonalities? Through cooperative research with Pompeu Fabra University in Barcelona, Spain, under the direction of Professor Xavier Serra, Korg has arrived at a technology “Artistry” (*1) for evaluating “good sound” based on five elements.

1: Pitch Stability
2: Dynamic Stability
3: Timbre Stability
4: Timbre Richness
5: Attack Clarity

Simultaneously with the tuner display, a radar chart shows the results of analyzing these five elements in real time, and scores them on a scale of 100 points. While tuning, you can see at a glance what aspects of your tone are lacking. You can also listen to a model tone and hear how it differs from your own sound. This is highly recommended for beginners who have just started a musical instrument, as well as for intermediate players who want to advance to the next level.

*1: Automatic Rating Technology for musical InSTRument plaYers

Automatically record “good sound,” and check your daily advances in technique:
Data is automatically recorded and kept when tuning and scoring. You can audition the accumulated recording data or recall a radar chart for it, and you can also check the number of hours you practiced and your best score for each day. By looking at your past results, you can see how you are progressing. In addition, you can post your score to a social networking service such as Facebook or Twitter allowing you to record or upload your daily progress (or backsliding) as if you were writing a diary. Whether you use this to compete with your friends or to give encouraging comments, it's a great way to improve your skill while enjoyably sharing information.

Compete with the world for “good sound”:
Your ranking is compiled by averaging your highest score for each note, and displayed. You'll be able to see your current position among performers around the world who use cortosia.

Supports flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium.

A full range of basic functionality including tuner, metronome, and level meter:
In addition to a chromatic tuner that benefits from Korg's forty years of know-how in tuner development, there's a metronome that supports tap tempo, and even a level meter, making cortosia a great partner for performance or practice.

## Key features

- Real-time analysis of five 'good sound' elements
- Instant scoring on a 100-point scale
- Daily practice recording and progress tracking
- Global ranking for 'good sound' competition
- Supports multiple wind and string instruments
- Model tone comparison

## Recent user reviews (10 of 22)

All indexed reviews: https://appshunter.io/ios/app/korg-cortosia/id952982019/reviews.md

### 5/5 — 動きました

*2026-04-28*

バージョンアップしました。ios26バージョンから動かなくなったメトロノームが動くようになりました。修正ありがとうございました。早速使っています。また何かありましたら宜しくお願いします。
まだまだ使って行きたいです♪ うれしいです！

**Developer response:** 先日はご不便をおかけし、誠に申し訳ございませんでした。

この度、不具合を修正した新しいバージョンをリリースいたしました。お手数ですが、アプリを最新バージョンへアップデートいただけますでしょうか。

アップデート後、お気づきの点やご感想などがございましたら、ぜひお聞かせいただけると幸いです。

お待たせしてしまい、大変恐縮でございます。今後とも引き続きご愛顧のほど、よろしくお願い申し上げます。

コルグアプリチーム

### 3/5 — ios26

*2026-01-13*

ios26にアップデートしたらメトロノームが動かなくなった。

**Developer response:** 先日はご不便をおかけし、誠に申し訳ございませんでした。

この度、不具合を修正した新しいバージョンをリリースいたしました。お手数ですが、アプリを最新バージョンへアップデートいただけますでしょうか。

アップデート後、お気づきの点やご感想などがございましたら、ぜひお聞かせいただけると幸いです。

お待たせしてしまい、大変恐縮でございます。今後とも引き続きご愛顧のほど、よろしくお願い申し上げます。

コルグアプリチーム

### 4/5 — メトロノーム使いながらレーダーチャートを使いたい

*2025-05-19*

音階練習でメトロノームを使っていると、レーダーチャートが出ませんし評価されません（現仕様）。
レーダーチャートの右上隅に、小さなメトロノームを表示し、メトロノームの音無しで使いたいのですが、機能を追加していただけないでしょうか？
また、現在はアタックとコアの評価がされますが、メトロノームと合わせることでリリース時の評価もできると思います。
リリース時の評価もできるようにしていただけないでしょうか？
これらの機能が追加されれば基礎練習の意味が格段に上がり、音全体が良くなると考えます。
ご検討よろしくお願いいたします。

**Developer response:** 先日はご不便をおかけし、誠に申し訳ございませんでした。

この度、不具合を修正した新しいバージョンをリリースいたしました。お手数ですが、アプリを最新バージョンへアップデートいただけますでしょうか。

アップデート後、お気づきの点やご感想などがございましたら、ぜひお聞かせいただけると幸いです。

お待たせしてしまい、大変恐縮でございます。今後とも引き続きご愛顧のほど、よろしくお願い申し上げます。

コルグアプリチーム

### 1/5 — Ipad非対応？

*2023-01-02*

ようこそgame centerへと中華製のなにかがでてきて、起動できません。

### 3/5 — 楽器の追加

*2022-05-03*

楽器の追加は、されないのですか。

オーボエ、
フレンチホルン
希望。

### 3/5 — Sticky pitch identification

*2021-11-17*

I use this while playing the violin.

The meter is good at telling me when I’m in tune, but naming the pitch is sticky.

For example, playing D string, and then moving to E, the app while tell me that I’m in tune, but call the note “D”.

The pitch identification needs to be updated more frequently

### 5/5 — Wonderful

*2019-06-30*

Please add oboe support.

### 5/5 — Better musical skills

*2017-10-08*

By using this app my tone has developed really well. I use this app every day.

### 3/5 — 使い道

*2017-09-28*

クラリネットを吹いて40年になろうかという者です。
このアプリを単なるチューナーアプリだと思って使うとがっかりします。40年染み付いた癖を見直す良いきっかけになることを期待して使用しています。
自分の音をすぐにフィードバックしてくれるところや、お手本の音との比較ができるところが良いですね。
どこをどうすると評価値が上がり、何に気をつければ良いか、といったことを丹念に検証しつつ使うものと思った方が良いです。
その意味で、あまり初心者向きとはいえないかもせれません。
星は標準的な3つにしたのはそのためです。
お手本よりも良いスコアが出ると嬉しくなります。実際、その時の音は確かにお手本よりも良い音になっています。

2017.9.27追記
iOS11になって、動作が不安定になったようです。
出来るだけ速やかに対応していただけると助かります。

### 1/5 — つかえない…

*2017-03-22*

サックススクールに通う初心者です。
先生から、「家でもチューニングする癖つけた方が良いよ」と言われ購入して見た…使えない。
先生も「何だこれ！全く使えないなぁ。返金してもらえ」って。

## Frequently asked questions about KORG cortosia

### What instruments does KORG cortosia support?

KORG cortosia supports performance evaluation for flute, clarinet, trumpet, violin, cello, saxophone, trombone, and euphonium. It is designed to help musicians playing these specific instruments improve their sound.

### How does KORG cortosia analyze 'good sound'?

KORG cortosia analyzes 'good sound' based on five elements developed in cooperation with Pompeu Fabra University: Pitch Stability, Dynamic Stability, Timbre Stability, Timbre Richness, and Attack Clarity. These are rated in real-time on a radar chart.

### Can I track my practice progress with KORG cortosia?

Yes, KORG cortosia automatically records your tuning and scoring data. You can review accumulated recordings, check past radar charts, and see your daily practice hours and best scores to monitor your technical improvement.

### Does KORG cortosia have ads?

No, KORG cortosia does not contain advertisements. The app is a paid application, and users can enjoy its features without interruptions from ads.

### What are the operating requirements for KORG cortosia?

KORG cortosia requires iOS 8 or later and is compatible with iPhone 5 or later, and iPod Touch 5th Generation or later. Ensure your device meets these specifications to use the app.

### How does KORG cortosia compare to other tuners?

Unlike standard tuners, KORG cortosia goes beyond basic pitch detection to analyze and rate five critical elements of sound quality. This interactive approach aims to make practice more enjoyable and effective for improving overall performance.

### What is the price of KORG cortosia?

KORG cortosia is a paid application priced at $4.99. This one-time purchase grants access to all its features for analyzing and improving musical sound.

### How often is KORG cortosia updated?

The latest version of KORG cortosia is 1.6.2, which was last updated on November 1, 2018. While updates have not been frequent recently, the app has been stable since its release in 2015.

## Version history (last 5 releases)

### 1.6.3 — 2026-04-27

- Fixed an issue where the app would crash when using the metronome
- Fixed an issue where users could not exit the ranking
- Other minor bug fixes and improvements

### 1.6.2 — 2018-11-01

- Fixed a bug that prevented users from playing back recorded performances
- Other minor bug fixes and improvements

### 1.6.1 — 2017-12-07

- Fixed a bug on audio processing
- Other improvements and bug fixes

### 1.6.0 — 2017-01-25

- Supported the Game Center
- Changed how to compute a ranking score
- Deleted the upload function
- Other improvements and bug fixes

### 1.5.1 — 2016-06-02

- Fixed a bug that makes some devices unable to evaluate performances
- Improved a performance detection system for flute
- Other improvements and bug fixes

## Apps similar to KORG cortosia

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [Metronome Tuner \| Practice+](https://appshunter.io/ios/app/metronome-tuner-practice-plus/id858142974) | 4.4 (2,812) | Free | Music |
| [Smart Metronome & Tuner](https://appshunter.io/ios/app/smart-metronome-and-tuner/id889571826) | 4.7 (59,289) | Free | Music |
| [Metronome+](https://appshunter.io/ios/app/metronome-plus/id434136233) | 4.5 (1,199) | Free | Music |
| [Tuner T1](https://appshunter.io/ios/app/tuner-t1/id453056916) | 4.5 (10,205) | Free | Music |
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## More apps by KORG INC.

- [KORG iELECTRIBE for iPad](https://appshunter.io/ios/app/korg-ielectribe-for-ipad/id363714043)
- [KORG iMS-20](https://appshunter.io/ios/app/korg-ims-20/id401142966)
- [iELECTRIBE Gorillaz Edition](https://appshunter.io/ios/app/ielectribe-gorillaz-edition/id430288460)
- [SyncKontrol](https://appshunter.io/ios/app/synckontrol/id438617344)
- [KORG iKaossilator](https://appshunter.io/ios/app/korg-ikaossilator/id452559831)
- [KORG iPolysix for iPad](https://appshunter.io/ios/app/korg-ipolysix-for-ipad/id579232173)

All apps by KORG INC.: https://appshunter.io/developer/363714046

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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 2026-08-24.*