# BlueKeyDetect — Recording note scale detection

> Music key and tempo detection app for jam sessions. (iPhone/iPad app by Stefan Arnhold.)

- Source: https://appshunter.io/ios/app/bluekeydetect/id1493584771 (this page in markdown: same URL + `.md`)
- Developer: [Stefan Arnhold](https://appshunter.io/developer/432185706)
- Category: Music, Education
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 15 MB
- Languages: American English
- Released: 2020-01-04
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/bluekeydetect/id1493584771/reviews.md

## What is BlueKeyDetect?

If you are part of a jam sessions with guitar or bass, you should know the key in which the others are playing. The pros among you may be able to hear that, but I either need the information from the chord sheet or someone knows the key ...

As a programmer, I quickly have an app in mind simply recording a piece of a song and then recognizing the key via my iPhone.

The result is the BlueKeyDetect app:

One touch on the display plus a short piece of recording and the beats per minute with the key of the song are displayed. You should record short pieces several times or a slightly longer one to get the correct key displayed.

There are limits, since the key in the song can also change and depending on the song, the recognition can be difficult anyway, but in practice it still works quite well if you take a few things into account:

① Find places in the song where there is a lot of sound. Drums and percussion don't do much to recognize the key.

② The longer you record the song, the greater the chances of recognizing the correct key. Alternatively, you can record short phrases several times and then choose the most detected key.

③ Background noise makes detection difficult, so if possible record only the song and not at a low level.

## Key features

- Record audio clips
- Detect musical key
- Display beats per minute (BPM)
- Supports guitar and bass jam sessions
- Multiple recording options for accuracy


## Frequently asked questions about BlueKeyDetect

### How does BlueKeyDetect work?

BlueKeyDetect records a short piece of a song and analyzes the audio to display the musical key and beats per minute. For best results, record longer clips or multiple short phrases.

### What is the price of BlueKeyDetect?

BlueKeyDetect is a paid application, available for $0.99. This one-time purchase grants you access to all its features.

### Does BlueKeyDetect have ads?

No, BlueKeyDetect does not contain advertisements. As a paid app, it offers an uninterrupted user experience.

### On which devices can I use BlueKeyDetect?

BlueKeyDetect is compatible with iPhone, iPad, and iPod devices. It is designed for iOS users.

### How accurate is BlueKeyDetect?

The app generally works well in practice, but accuracy can be affected by changing keys within a song, background noise, and the presence of drums or percussion. Recording clear audio with prominent melody is recommended.

### When was BlueKeyDetect last updated?

The latest version, 2401, was released on January 19, 2024. This indicates ongoing support and potential improvements.

### What is the age rating for BlueKeyDetect?

BlueKeyDetect has an age rating of 4+, making it suitable for a wide range of users.

### Can BlueKeyDetect detect changing keys in a song?

The app's description notes that key changes within a song can make recognition difficult. It suggests recording multiple short phrases to identify the most frequently detected key.

## Version history (last 5 releases)

### 2401 — 2024-01-19

update iOS17

### 2109 — 2021-09-28

- Update iOS15

### 2011 — 2020-11-23

- iPad Air 2020 added
- changed launch screen image

### 2005 — 2020-05-13

- added new Apple devices
- iPad Version works now Landscape and Portrait

### 1.0 — 2020-01-04

No release notes.

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## More apps by Stefan Arnhold

- [iPianoChords](https://appshunter.io/ios/app/ipianochords/id432185703)
- [iPiano Chords HD](https://appshunter.io/ios/app/ipiano-chords-hd/id579996082)
- [Barcode Check](https://appshunter.io/ios/app/barcode-check/id794921622)
- [Kulla-Di-Bulla](https://appshunter.io/ios/app/kulla-di-bulla/id892032120)
- [HIBC Check](https://appshunter.io/ios/app/hibc-check/id966209958)
- [KullaDiBullaTV](https://appshunter.io/ios/app/kulladibullatv/id1051714004)

All apps by Stefan Arnhold: https://appshunter.io/developer/432185706

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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 2026-08-27.*