Frequency Detector Tool

Name: Frequency Detector Tool
Availability: InStock

Find the musical key of any frequency.

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App Store (iOS)Mac App Store macOS download Windows download itch.io

Overview

What it does.

Frequency Detector Tool is a free frequency and musical-key analyzer for producers, mixing engineers, sound healers, and the musically curious.

Type in any frequency in Hertz, like 315, 2.5k, or 29834, and instantly see the musical note it maps to, how many cents sharp or flat it is, whether it is in key for the key you’ve selected, the nearest “cut candidate”, and vocal-range context like the Mud Zone around 250 to 400 Hz. Switch on Listen mode and it hears your room, your mix, or your voice and shows the note, key, and exact Hz live, with a spectrum and a full zoomable chart across octaves 0 to 7.

Also included: clickable Solfeggio frequencies (432, 528, 639, 741, 852, 963), “Did You Know?” music-theory facts, and a calm, sacred-geometry inspired interface.

Completely free, no ads, no subscriptions, no catch. If it helps you, an optional donation supports more free tools.

Demo

See it in action.

Features

Built to tune you.

Real-time detection: Listen mode hears any input and shows the note, key, and exact Hz live.
Type any frequency: 315, 2.5k, 29834, get the note, cents off, in-key snap, and nearest cut.
Spectrum and full chart: A live spectrum plus a zoomable chart of every note across octaves 0 to 7, laid out for boosting and cutting in your key.
Solfeggio references: 432, 528, 639, 741, 852 and 963 Hz, one tap away, with what each is associated with.

Screens