# Auto-Key \| Music key detection — Music key and scale detection

> Detects musical key and scale from audio for music production. (iPhone/iPad app by Antares Audio Technologies, LLC.)

- Source: https://appshunter.io/ios/app/auto-key-music-key-detection/id1559061303 (this page in markdown: same URL + `.md`)
- Developer: [Antares Audio Technologies, LLC](https://appshunter.io/developer/1480455172)
- Category: Music, Utilities, Music
- Price: Free
- Rating: 3.94/5 from 87 App Store ratings · 76 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 38 MB
- Languages: English
- Released: 2021-08-24
- Data updated: 2026-08-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/auto-key-music-key-detection/id1559061303/reviews.md

## What is Auto?

Detect the musical key of any tune whether in the studio or on the go. Instantly share and sync the musical key with your Auto-Tune session running on your computer DAW.

Auto-Key detects the key by capturing a few seconds of audio and returns the most likely musical key. It also returns the diatonic key. 

You can use Auto-Key mobile on any audio coming from a speaker or from an acoustic instrument or a voice. Tap on the Auto-Key logo in the app home screen to find the key. 

Auto-Key Mobile was developed by Antares Audio Technologies, the inventors of Auto-Tune®.

## Key features

- Real-time key detection
- Diatonic key identification
- Audio capture from speakers, instruments, or voice
- Sync with computer DAW sessions
- Instant key sharing

## What do users think of Auto?

Overall sentiment: mixed

**Pros**

- 👍 Accurate key detection (most of the time)
- 👍 Useful for learning songs
- 👍 Handy keyboard display for novice players
- 👍 Free to use (initially)
- 👍 Good for vocal production
- 👍 Integrates with Auto-Tune
- 👍 Simple and functional
- 👍 Scales feature is a great addition
- 👍 Works as advertised
- 👍 "The Gold Standard. Fast & No Frills."
- 👍 "Great app for making music !!!!"
- 👍 "Super helpful product, great job"
- 👍 "Excellent utility"
- 👍 "Tut was es soll" (Works as it should)
- 👍 "Parfait" (Perfect)
- 👍 "Klappt immer" (Always works)
- 👍 "Eine sehr gute App" (A very good app)
- 👍 "Great App."
- 👍 "Works as advertised."
- 👍 "Solid, User Friendly Key Detection App"
- 👍 "Amazing tool, much needed"

**Cons**

- 🐛 Inconsistent key detection
- 🐛 Often gives wrong keys
- 🐛 Slow performance
- 🐛 Requires account creation after a few uses
- 🐛 Privacy concerns with data sharing
- 🐛 Account creation issues (buggy, can't access)
- 🐛 Low volume for built-in keyboard
- 🐛 Not recognizing modes other than major/minor
- 🐛 App becomes unusable without account
- 🐛 "Wrong Keys"
- 🐛 "No good results"
- 🐛 "Doesn’t work"
- 🐛 "So many questions"
- 🐛 "Was great, now not"
- 🐛 "Didn’t work for me"
- 🐛 "Waste of your time"
- 🐛 "Seems pretty handy for picking harmonica keys"
- 🐛 "What for?"
- 🐛 "Sign in to use"
- 🐛 "数回で" (Stopped working after a few times)
- 🐛 "Privacy thief"
- 🐛 "Truño" (Junk)
- 🐛 "Stinks"
- 🐛 "Em…"
- 🐛 "Works great, until…"
- 🐛 "This would be great if…"
- 🐛 "Does not work"
- 🐛 "Inconsistent key selection"
- 🐛 "The volume"
- 🐛 "Joke app"
- 🐛 "Seems random"
- 🐛 "I’m. It sure if it works because the piano scale volume is too low :/".
- 🐛 "Nothing to do"
- 🐛 "Requires login, does not support Sign in with Apple"
- 🐛 "About Auto-key"
- 🐛 "Not accurate at all unfortunately!"
- 🐛 "Not always right"
- 🐛 "Unusable"
- 🐛 "Da vergeht ein der Spaß" (The fun disappears with your subscription)
- 🐛 "The Redface" (Really good for key detection but…)
- 🐛 "heyhoob" (The volume)

**Commonly reported bugs**

- App is slow
- Account creation is buggy
- Cannot access new account after creation
- Low volume for built-in keyboard
- App becomes unusable after a few uses
- Key detection is inconsistent, giving different keys for the same song
- Does not recognize modes other than major and natural minor
- Login or account creation fails
- App stops working after a short period
- Volume issues with the built-in keyboard
- App refuses to let users try again without paying

**Most requested features**

- Bring auto tune to iPad
- Vocal sinking tools
- Display Camelot key
- Display BPM
- Auto-Tune FX mobile app
- Availability on Apple Watch
- Update Auto-Tune mobile app

## Recent user reviews (10 of 76)

All indexed reviews: https://appshunter.io/ios/app/auto-key-music-key-detection/id1559061303/reviews.md

### 1/5 — Terrible

*2026-06-27, version 1.1.0*

This is the worst app that’s ever been made, it’s only job is to find the key of whatever music is being played and still gets it wrong regularly, how has this been passed? It’s faulty

### 1/5 — Help

*2026-06-23, version 1.1.0*

Love it, won’t let me register, won’t let me reset password, won’t let me log in, infinitely stuck not being able to use it :(

### 2/5 — Useful

*2026-06-19, version 1.1.0*

Useful for getting a ball park idea -  though not nearly accurate enough - particular for Antares. 
For simple piano music it gives wildly different results when checking the same piece.

The piano keyboard displayed is far too quiet - even with the speaker next to my ear - then of course I cannot see the keys.

### 1/5 — Rather pay than sign up

*2026-06-05, version 1.1.0*

Can i just pay for the app and not make a login?  I don’t understand why key detection requires a username and password. I liked this app before this change because it was simple to use, with no extra stuff. Now idk

### 3/5 — Fails

*2026-05-31, version 1.1.0*

Will not allow sign or reset password!

### 5/5 — Bring auto tune to ipad

*2026-05-08, version 1.1.0*

Hi, please bring auto tune. iPad would be amazing to have it and if you have any vocal sinking tools, you can bring as well. It would be very useful.

### 1/5 — Wrong Keys

*2026-04-09, version 1.1.0*

I tried this app, every single song I sung, it gave me the wrong key. And besides that the app is slow. They say perfect pitch in your pocket… someone with perfect pitch will know the key almost instantly. This requires like 10 seconds of singing… just to give you the wrong key. Imagine how embarrassing it would be if a tone deaf person were relying on this app in a Live Musical Setting.

### 2/5 — Another account driven app

*2026-04-04, version 1.1.0*

Starts off well - but after a few uses request to make an account.  If something’s free you are the commodity.

### 1/5 — Doesn’t work

*2026-03-12, version 1.1.0*

Keys are usually wrong

### 2/5 — No good results

*2026-01-04, version 1.1.0*

I tested on some reggae tunes I know the keys of, but it failed and after a few attempts I should have had to register. Nonsense.

## Frequently asked questions about Auto

### What does Auto-Key do?

Auto-Key is a mobile application designed to detect the musical key and scale of any audio source. It can analyze audio from speakers, acoustic instruments, or vocals, providing instant results.

### How does Auto-Key detect the musical key?

The app captures a few seconds of audio and analyzes it to determine the most likely musical key. It also identifies the diatonic key, offering comprehensive key information.

### Can I use Auto-Key with my computer software?

Yes, Auto-Key allows you to instantly share and sync the detected musical key with your Auto-Tune session running on your computer's Digital Audio Workstation (DAW). This streamlines your music production workflow.

### Is Auto-Key compatible with different audio sources?

Auto-Key is versatile and can be used on any audio coming from a speaker, an acoustic instrument, or a voice. Simply tap the app's logo to initiate the detection process.

### Who developed Auto-Key?

Auto-Key Mobile was developed by Antares Audio Technologies, the renowned inventors of Auto-Tune®, ensuring a high level of expertise in audio processing and music technology.

## Version history (last 3 releases)

### 1.1.0 — 2022-01-25

- Send to Auto-Tune® functionality added for Windows
- VoiceOver support

### 1.0.1 — 2021-08-31

UI enhancements

### 1.0 — 2021-08-24

No release notes.

## Apps similar to Auto

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [AI Chord Finder: Guitar Tabs](https://appshunter.io/ios/app/ai-chord-finder-guitar-tabs/id6462842110) | 4.6 (85) | Free | Music |
| [STUDIO AI - AI Song & Music](https://appshunter.io/ios/app/studio-ai-ai-song-and-music/id6499012974) | 4.3 (313) | Free | Music |

## More apps by Antares Audio Technologies, LLC

- [Auto-Tune Ignite: Vocal Studio](https://appshunter.io/ios/app/auto-tune-ignite-vocal-studio/id6476694977)
- [Auto-Tune AUv3](https://appshunter.io/ios/app/auto-tune-auv3/id6554003058)
- [VoCap by AutoTune®](https://appshunter.io/ios/app/vocap-by-autotune/id6740216111)

All apps by Antares Audio Technologies, LLC: https://appshunter.io/developer/1480455172

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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 2026-08-11.*