# Key Changer — Detect Audio Keys & Transpose

> Detect Audio Keys & Transpose (iPhone/iPad app by Joseph Ratterman.)

- Source: https://appshunter.io/ios/app/key-changer/id6780648386 (this page in markdown: same URL + `.md`)
- Developer: [Joseph Ratterman](https://appshunter.io/developer/6777538376)
- Category: Music, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English
- Released: 2026-08-26
- Data updated: 2026-08-29
- User reviews in markdown: https://appshunter.io/ios/app/key-changer/id6780648386/reviews.md

## What is Key Changer?

Key Changer helps musicians make music fit their voice, instrument, and group. Find a song's key, transpose audio recordings, and transpose chord charts into the key you need.

AUDIO FILE TRANSPOSITION

• Import an audio recording and detect its musical key
• Choose a new key and transpose the recording
• Preview the transposed result before exporting
• Share your new version in M4A or WAV format

LIVE AUDIO DETECTION

• Use your iPhone microphone to listen to music playing nearby
• Capture a 12-second sample to estimate a song's key and tempo
• Helpful for rehearsals, live performances, and learning songs by ear

CHORD SCANNER

• Choose a current key and target key for a chord chart
• Point your camera at a chord sheet to see transposed chord labels as you scan
• Capture a snapshot, or import a PDF or image of a chord chart
• Review and share a transposed chart for practice, rehearsal, or performance

Key Changer is made for vocalists finding a comfortable range, worship leaders preparing charts for their teams, bands adapting songs for live performance, music students, and anyone learning by ear.

All audio analysis and chord recognition happen on your device. No account or subscription is required. Clear audio and easy-to-read chord charts provide the best results; automatic key and tempo results are helpful estimates, so trust your ears too.


## Version history (last 1 release)

### 1.0 — 2026-08-26

No release notes.

## More apps by Joseph Ratterman

- [Folder Looper](https://appshunter.io/ios/app/folder-looper/id6777538254)

All apps by Joseph Ratterman: https://appshunter.io/developer/6777538376

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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 2026-08-29.*