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By Daniel Casady

This app is only available on the App Store for iOS devices.


Key+ is a handy tool for estimating the musical key of digital recordings and live audio. A must-have for musicians and DJ's, Key+ analyzes audio and returns both the key and it's relative major or minor signature.

What's New in Version 2.2

*Updated UI

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2

Customer Reviews

I like it

Works well, setting sample rate at a longer time helps.
It's not perfect but mostly correct, some songs are very complex and hard for software but most popular music songs work, I use it when playing harmonica!

Great for singers

Sing into the microphone until the percentage at the bottom of the screen gets to 100%. And up pops the key you're singing in.

Good but needs some work

The app works well for instrumentals. If there are voacls, it will throw off the app. It's good but of course could use work.

View in iTunes
  • $1.99
  • Category: Music
  • Updated:
  • Version: 2.2
  • Size: 2.3 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
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