Song Key Finder
Listen deeper. Find the tonal center.
Analyze a Song
Upload an audio file for the most reliable key estimate. YouTube link analysis is available as a secondary option when cloud access or the local helper can reach the video.
Checking API...
Checking YouTube access...
Waking the analyzer
The first request after an idle period can take a few seconds.
Open service status
Recommended: upload audio
Your upload is used only for analysis and is deleted from temporary storage when the job finishes.
Optional: YouTube link
YouTube analysis depends on cloud download access. If YouTube blocks the server, use the local helper or upload an audio file instead.
Local Helper fallback
Use this only for YouTube links that the cloud API cannot download.
The helper runs on your computer as a backup for YouTube links. Uploaded audio files do not need the helper.
- On Mac, unzip the helper and run INSTALL_MAC_HELPER_PROTOCOL.command once.
- On Windows, unzip the helper and run the setup files once.
- Return here and use Start Helper only when you want to run the local fallback.
Ready when you are.