# Key Detect — Music Harmony Finder

> Real-time music key detection for DJs and musicians. (iPhone/iPad app by MIXVIBES.)

- Source: https://appshunter.io/ios/app/key-detect/id824107485 (this page in markdown: same URL + `.md`)
- Developer: [MIXVIBES](https://appshunter.io/developer/417255034)
- Category: Music, Utilities
- Price: $2.99
- Rating: 2.20/5 from 37 App Store ratings · 70 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.3 · 18 MB
- Languages: American English
- Released: 2014-03-05
- Data updated: 2026-09-08
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/key-detect/id824107485/reviews.md

## What is Key Detect?

Key Detect identifies the key of any sound in real time. Fast & easy with your device mic. Key Detect is developed by Mixvibes, creator of pro DJ apps for 15 years, downloaded by millions worldwide. 

////WHEN DO I USE IT
- Detect the key of playing song for harmonic mixing when DJing.
- Train yourself to recognize any song’s key.
- Learn musical theory when playing chords.

////MAIN FEATURES
- Hit the Key Detect button to identify the key.
- Display matching keys.
- Display key in classic notation or harmonic code.
- Follow the tunes’ tone change with dynamic display.

//// ABOUT MIXVIBES
Mixvibes makes professional DJ software and apps. Downloaded by millions worldwide, its flagship app Cross DJ is available on Mac and iOS. Mixvibes is also the company behind Pioneer’s rekordbox™, the worldwide club standard music management software.

////GET A DJ APP
iPhone: http://appstore.com/crossdjforiphone
iPad: http://appstore.com/crossdj
Mac: http://appstore.com/mac/crossdj

////LATEST NEWS
Website: www.mixvibes.com
Youtube: https://www.youtube.com/mixvibes
Facebook: https://www.facebook.com/mixvibes
Twitter: https://twitter.com/mixvibes

## Key features

- Real-time key identification
- Harmonic mixing support
- Musical theory training
- Classic and harmonic notation
- Dynamic tone change display

## Recent user reviews (10 of 70)

All indexed reviews: https://appshunter.io/ios/app/key-detect/id824107485/reviews.md

### 1/5 — Ne marche pas

*2025-07-16*

Je ne comprends pas les avis positif de cette app car elle ne fonctionne tout simplement pas, j’ai testé une vingtaine de musiques dont je connaissait déjà la gamme, et l’application a trouvé la bonne gamme que pour 3 ou 4 musiques, elle n’est donc pas fiable du tout, et payer pour ça non merci, je ne recommande pas !

### 1/5 — Can’t open the app !!

*2025-03-12*

Just bought the app and it crashes every time I try to open it ! I want refund , not happy at all!! 😔

### 1/5 — Was great

*2025-03-02*

Now doesn’t stay open. Crashes upon opening.

### 1/5 — Junk

*2022-12-26*

Don’t waste your money it’s rubbish

### 1/5 — Absolute rubbish

*2022-12-26*

One of the worst apps I’ve ever wasted money on

### 1/5 — Not accurate - waste of time.

*2022-08-08*

Title says it all.

### 5/5 — Juste magnifique

*2021-07-11*

Cette app me sauve la vie 😍
En tant que technicien audio live. Dans le cadre de mon activité, connaître la tonalité de chaque musique performée par les musiciens est indispensable. Mais n’ayant pas l’oreille absolue, cette app est mon bras droit 🤗

### 3/5 — Not working

*2021-05-29*

I’ve had this app for a good year or 2 and it all of a sudden stopped working today. It won’t pick up any sound and the mic is enabled.

### 3/5 — Works just fine

*2021-03-03*

It took some time to figure out the way the app runs, but it’s fairly easy to use and pretty accurate for musical purposes. Tbh, it’s suitable to use and have if you don’t have mixed in key.

### 1/5 — This app does not do what is Says it does,

*2021-01-23*

Simply does not work, it won’t give you an accurate key, do not buy.

## Frequently asked questions about Key Detect

### What does Key Detect do?

Key Detect identifies the musical key of any sound in real-time using your device's microphone. It's designed to help with harmonic mixing for DJs, train your ear to recognize song keys, and assist in learning musical theory when playing chords.

### What are the main features of Key Detect?

The app allows you to hit a button to identify the key of a sound, displays matching keys, and can show the key in either classic notation or harmonic code. It also features a dynamic display that follows the tunes' tone changes.

### Is Key Detect free to use?

Based on the provided information, the application is available for free. There are no mentions of in-app purchases or advertisements, suggesting a completely free experience.

### Who developed Key Detect and what is its background?

Key Detect is developed by Mixvibes, a company with 15 years of experience creating professional DJ software and apps. Millions have downloaded their products, including the flagship app Cross DJ, and they are also behind Pioneer's rekordbox™.

### How can Key Detect help with DJing?

Key Detect is particularly useful for DJs looking to perform harmonic mixing. By identifying the key of a playing song in real-time, DJs can select tracks that are harmonically compatible, leading to smoother transitions and a more cohesive set.

## Version history (last 5 releases)

### 2.1.0 — 2017-11-21

This update from Apple will improve the functionality of this app. No new features are included.

This version adds several improvements. Feel free to leave a review to let us know what you think and contact us at support@mixvibes.com if you encounter any issue. 

// Improvements and new features:
- Continuous key analysis: start and stop analysis manually. 
- Suggested compatible keys are now displayed in real time. 
- Select a suggested key as the current key to display other compatible keys (when analysis is stopped). 
- Display previous key values while waiting for the next result (instead of "Sound calibration" message). 
- "C" is the default key when opening the app.

### 2.0.0 — 2017-11-02

We heard your feedback and updated our key detection algorithm. 
The detection has been improved for more accurate results. 
We also added a new silence detection to pause analysis when no music is playing.

Other improvements includes fixed playback of detected notes for iPhone 7 and general stability improvement. 
Please contact us at support@mixvibes.com if you encounter any issue.

### 1.0.3 — 2017-10-26

This version adds iOS 11 compatibility, several bug fixes and improvements on key detection accuracy.

- Fixed result reliability.
- Fixed stability issues.
- Fixed running in background (completely disabled).
- Fixed possible crash at exit.
- Fixed playback of detected key or scale.

Thanks using Key Detect, please contact us at support@mixvibes.com if you encounter any issue.

### 1.0.2 — 2017-10-18

This version adds iOS 11 compatibility and several bug fixes and improvements.

Thanks using Key Detect, please contact us at support@mixvibes.com if you encounter any issue.

### 1.0.1 — 2014-03-20

Stability improvements.

Thanks for using Key Detect - Music Harmony Finder! Please take some time to support us and rate our app :)

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## More apps by MIXVIBES

- [Cross DJ Pro - Mix & Remix](https://appshunter.io/ios/app/cross-dj-pro-mix-and-remix/id509520532)
- [Cross DJ - Music Mixer App](https://appshunter.io/ios/app/cross-dj-music-mixer-app/id584824960)
- [Remixlive - Make Music & Beats](https://appshunter.io/ios/app/remixlive-make-music-and-beats/id1058801458)
- [Beat Detect](https://appshunter.io/ios/app/beat-detect/id1288620395)
- [Beat Snap - Music & Beat Maker](https://appshunter.io/ios/app/beat-snap-music-and-beat-maker/id1356137096)

All apps by MIXVIBES: https://appshunter.io/developer/417255034

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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 2026-09-08.*