# Key? — Find the key of any song!

> Real-time song key detection and harmonic analysis app. (iPhone/iPad app by Bill ONeill Design LLC.)

- Source: https://appshunter.io/ios/app/key/id1535806085 (this page in markdown: same URL + `.md`)
- Developer: [Bill ONeill Design LLC](https://appshunter.io/developer/1509780535)
- Category: Music, Music, Entertainment
- Price: $0.99
- Rating: 3.29/5 from 7 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.1 · 117 MB
- Languages: English
- Released: 2020-10-28
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/key/id1535806085/reviews.md

## What is Key??

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...

## Key features

- Real-time key detection
- Tracks key changes
- Dynamic harmonic analyzer
- Auto-noise cancelling
- Offline functionality
- Built-in calibration

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/key/id1535806085/reviews.md

### 1/5 — Money back

*2022-03-26*

I need my money back. Does not work

### 1/5 — Doesn’t seem to do anything

*2021-06-11*

Would be awesome if it worked

## Frequently asked questions about Key?

### What is Key? used for?

Key? is used to instantly identify the musical key of any song you are listening to. It can also track changes in key throughout a song, such as for choruses or bridges.

### How does Key? work?

Key? uses a neural learning program that has analyzed thousands of songs. It utilizes your device's built-in microphone with auto-noise cancelling to detect the key in real-time, without needing an internet connection.

### Can Key? detect key changes within a song?

Yes, Key? is designed to track and display any changes in the song's key in real-time, providing insights into its harmonic structure.

### What is the dynamic real-time harmonic analyzer in Key?

The harmonic analyzer in Key? visually represents how note energy changes over time, with each column representing a different octave. This feature offers a hypnotic view of the song's harmonic progression.

### Is Key? free to use?

No, Key? is a paid application. It is available for purchase at $0.99.

### What devices is Key? compatible with?

Key? is compatible with iPhone, iPad, and iPod devices.

### How often is Key? updated?

The application was last updated on October 28, 2020, with version 1.0. Further update frequency is not specified.

### Does Key? have ads?

No, Key? does not contain advertisements. It is a completely ad-free application.

## Version history (last 1 release)

### 1.0 — 2020-10-28

No release notes.

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## More apps by Bill ONeill Design LLC

- [BrainwaveZ](https://appshunter.io/ios/app/brainwavez/id1509780536)
- [Coherence Tuner](https://appshunter.io/ios/app/coherence-tuner/id1530601625)
- [BinauralZ](https://appshunter.io/ios/app/binauralz/id1554760084)

All apps by Bill ONeill Design LLC: https://appshunter.io/developer/1509780535

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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 2026-06-10.*