Song Key Finder

Song Key Finder helps you determine a song's key quickly and privately. It supports three methods: real-time analysis from the device microphone, processing of local audio files, and analysis from a set of user-entered chords. All analysis runs on-device, so your data never leaves your device.

Saved scans can be revisited later. If a song modulates, you can add chords or re-run analysis for the affected section. The extension is lightweight, fast, and privacy-conscious for musicians, students, and hobbyists.