To celebrate the first release we are discounting this app for the next 100 downloads! Enjoy!

Have you ever been listening to a song and wondered what key it was in?

Have you wondered about songs that change key part way through the song, for a chorus or bridge?

Now, you don't have to wonder!

We have implemented a neural learning program and made it listen to thousands of songs - just so it can instantly tell you the key of the song you are listening to.

It uses the built-in microphone, has auto-noise-cancelling, does not need any remote connection, has built-in calibration and is completely plug and play!

Just start the app and let it listen - within a couple of seconds it will be able to tell the current key, and track any changes in real time.

You can even see how the note energy changes over time in the dynamic real-time harmonic analyzer - each column represents a different octave! It's hypnotic!

You will be amazed how many songs are identified as using a major key - but end-up playing in its relative minor! Or, how many Blues/Rock songs use the A Minor Blues scale for solos - regardless of the actual song key...

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

App Privacy

The developer, Bill O'Neill Design LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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