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Key Detect

Key Detect

Music Harmony Finder

37 ratings
74 reviews
🔧 Utilities
🎵 Music

Archived App (Last seen on 10 Oct 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

Details

Released
March 5, 2014
Updated
November 21, 2017

Features

Developer

MIXVIBES
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About

Instantly identify the musical key of any sound using your device's microphone. Ideal for DJs, musicians, and music students, it provides real-time harmonic analysis and supports both classic and harmonic notation.

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

What users say about Key Detect

Reviews of Key Detect are mostly negative: the Music app is rated 2.2/5 from 37 App Store ratings. What users like most: useful for music production, helpful for DJs. Top complaints: doesn't work, not reliable. Summarized from real user reviews.

Positive things

  • 👍Useful for music production
  • 👍Helpful for DJs
  • 👍Good for songwriting
  • 👍Works for electronic music
  • 👍Identifies key nicely
  • 👍Accurate for its purpose
  • 👍Cool design
  • 👍Practical for DJs
  • 👍Precise key recognition
  • 👍Real-time key analysis
  • 👍Useful for Camelot code
  • 👍Good for distinguishing sounds
  • 👍Helps understand key differences
  • 👍Can determine pitch of heard sound
  • 👍Works well for electro/house
  • 👍Great for live audio technicians
  • 👍Saves life for audio techs
  • 👍Works fine
  • 👍Pretty accurate for musical purposes
  • 👍Suitable for use
  • 👍Amazing for music production
  • 👍Beat detect makes life easy
  • 👍Simple and good
  • 👍Works
  • 👍Great app
  • 👍Worth every penny
  • 👍Gets key right almost every time
  • 👍Very easy to use
  • 👍Works perfectly
  • 👍Best $3 spent
  • 👍Helpful results
  • 👍Fun to use
  • 👍Great app for determining key

Negative things

  • 🐛Doesn't work
  • 🐛Not reliable
  • 🐛Crashes on opening
  • 🐛Rubbish
  • 🐛Absolute rubbish
  • 🐛Waste of time
  • 🐛Not accurate
  • 🐛Waste of money
  • 🐛Inaccurate key detection
  • 🐛Doesn't do what it says
  • 🐛Complete waste of money
  • 🐛Provides only basic metronome
  • 🐛Disappointing accuracy
  • 🐛Bad interface
  • 🐛Unclear when listening/analyzing
  • 🐛Display not clear
  • 🐛Don't trust the app
  • 🐛Regret buying
  • 🐛No instructions found
  • 🐛Not as described
  • 🐛Far off on known keys
  • 🐛Not for the lazy
  • 🐛Not foolproof
  • 🐛Misbehaving recently
  • 🐛Terrible
  • 🐛Want refund ASAP
  • 🐛So disappointing
  • 🐛Low service
  • 🐛Useless
  • 🐛Struggles with basic songs
  • 🐛Trash
  • 🐛Wouldn't recommend
  • 🐛Didn't work well
  • 🐛Lost my money
  • 🐛Not for guitarists
  • 🐛Scamming people
  • 🐛No detecting, just plays keys
  • 🐛Hit or miss
  • 🐛Not accurate whatsoever
  • 🐛Piece of crap
  • 🐛Doesn't work
  • 🐛Charged for no reason
  • 🐛Untrustworthy
  • 🐛Waste of time and money
  • 🐛Doesn't detect anything
  • 🐛Singing but no song key returned
  • 🐛Broken
  • 🐛Doesn't turn off
  • 🐛No support
  • 🐛RIPOFF
  • 🐛Does not work
  • 🐛Every song was the same
  • 🐛Doesn't work with iPhone music
  • 🐛External music only
  • 🐛Needs lots of work
  • 🐛Detects every note as B
  • 🐛Different result every time
  • 🐛Not worth downloading
  • 🐛Inaccurate
  • 🐛No usable help
  • 🐛Useless
  • 🐛Doesn't do anything valuable
  • 🐛Complete and utter scam
  • 🐛Does not work well
  • 🐛Annoyed
  • 🐛Has not gotten any tracks correctly
  • 🐛Slow
  • 🐛Struggles with non-electro music
  • 🐛Other bubbles unclear
  • 🐛Not entirely clear how to use
See all reviews

What's New in Key Detect

2.1.0

November 21, 2017

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.

More

User reviews

Most RecentHighest RatedLowest Rated

Detected key inconsistent

Bought this app to identify keys for dj mixing. Tried it for a while and notice every time I got different keys even with same songs… not sure if I can trust the results.. anyone has similar issue?
JJayho18

Ne marche pas

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 !
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BBlackMagic1987

Can’t open the app !!

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

Was great

Now doesn’t stay open. Crashes upon opening.
NSNot OK. Stupid

Junk

Don’t waste your money it’s rubbish
MWme to as well
See 69 more reviews

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User experience

🐞

Reported Bugs

10 issues

Crashes every time on opening

Bug

Stopped working suddenly

Bug

Won't pick up any sound

Bug

Doesn't stay open

Bug

Start button only changes color, unclear status

Bug

Display stuck or updated?

Bug

App runs continuously with iOS 11

Bug

Doesn't work with music on iPhone

Bug

Gives different results for the same song

Bug

Doesn't turn off easily

Bug
✨

Requested Features

4 requests

Add a help link or option

Feature

Update the app for new iOS versions

Feature

Improve accuracy for non-electronic music

Feature

Provide clear instructions

Feature

FAQ

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.