Observed arrival · 2026-09-11

Tempo & Key Finder Keeps the Audio on Your Device

tempokeyfinder.com Observed source

Editorial interest 82/100 Selection signal · not a rating of the site

A browser-based analyzer that estimates a song’s BPM, musical key, Camelot code, and related timing and harmonic context.

Landing page captured for the 2026-09-11 issue.

Field notes

Audio is decoded and analyzed locally after selection, with the page stating that filenames, PCM, and results remain on the device. A batch can contain up to 20 files, each capped at 100 MB or 20 minutes, and the output includes decimal BPM, half- and double-time readings, milliseconds per beat, key mode, Camelot notation, and relative-key context. The site also links to separate Tap Tempo, Camelot Wheel, and Key Transposer utilities.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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