What does Key Changer do?
Key Changer detects musical key and tempo, transposes audio to a different key, and recognizes and converts chords in camera views, images, and PDFs.
Key Changer Support
Detect song keys and tempo, transpose audio, and convert chord sheets on your iPhone.
Features
- Detect the musical key and tempo of audio files
- Listen through the microphone for key and tempo
- Transpose songs up or down by semitones
- Preview and export transposed audio as M4A or WAV
- Scan chord sheets with the camera in real time
- Transpose chords in snapshots, images, and PDFs
- Convert between letter chords and Nashville numbers
- Process audio and chord sheets locally on your device
Frequently Asked Questions
Who is Key Changer for?
Key Changer is designed for musicians, singers, worship leaders, and anyone who needs to practice a song in a different key.
Does Key Changer collect personal information?
No. Key Changer does not require an account, use analytics or advertising, or transmit your audio, images, documents, or microphone recordings.
How accurate is automatic detection?
Automatic key, tempo, and chord recognition are estimates. Results can vary with recording quality, background noise, unusual harmony, image clarity, and page layout.
Why can't I use the camera or microphone?
Open iOS Settings, find Key Changer, and confirm that Camera or Microphone access is enabled. The App requests each permission only when you start the related feature.
Where can I get support?
Use the support email below for questions, suggestions, or bug reports.
Privacy
Key Changer processes audio, microphone recordings, camera images, and chord sheets locally on your device without tracking or analytics.
Support
Your feedback is appreciated. Send questions, suggestions, and/or bug reports to:
Allow up to 14 business days for responses.