# Frequency Detector Tool — Find the musical key of any Hz

> Analyzes musical keys from Hertz frequencies with detailed note and EQ context. (iPhone/iPad app by Eye Heru.)

- Source: https://appshunter.io/ios/app/frequency-detector-tool/id6786799596 (this page in markdown: same URL + `.md`)
- Developer: [Eye Heru](https://appshunter.io/developer/6786799838)
- Category: Music, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 9 MB
- Released: 2026-07-09
- Data updated: 2026-08-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/frequency-detector-tool/id6786799596/reviews.md

## What is Frequency Detector Tool?

Frequency Detector Tool is a free, elegant 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 (e.g. A4 = 440 Hz)
How many cents sharp or flat it is
Whether it's IN KEY for the key you've selected
The nearest "cut candidate" — the closest out-of-key frequency
Vocal context notes to guide your EQ decisions


Pick your key from all 12 tones and the whole analysis updates instantly, showing
the in-key snap, the nearest cut, and vocal-range context (like the "Mud Zone"
around 250–400 Hz).

Open the full frequency chart to see every note across octaves 0–7, laid out for
boosting and cutting in your chosen key — scroll to explore the entire spectrum.

Also included:


Clickable Solfeggio frequencies (432, 528, 639, 741, 852, 963) with a note on
what each is associated with
"Did You Know?" music-theory facts
A calm, sacred-geometry inspired interface


Frequency Detector Tool is completely free — no ads, no subscriptions, no catch.
It's my first app, made with love. If it helps you, an optional donation on
eyeheru369.com supports more free tools.

Works on iPhone, iPad, and Apple Vision Pro.

## Key features

- Frequency to musical note conversion
- Cents sharp/flat indication
- In-key analysis for selected keys
- Nearest cut candidate identification
- Vocal context notes for EQ
- Full frequency chart exploration
- Solfeggio frequencies with associations


## Frequently asked questions about Frequency Detector Tool

### What musical keys can Frequency Detector Tool analyze?

Frequency Detector Tool allows you to select any of the 12 musical tones to analyze frequencies against. The analysis instantly updates to show the in-key snap, nearest cut, and vocal-range context for your chosen key.

### Does Frequency Detector Tool have ads?

No, Frequency Detector Tool is completely free with no ads or subscriptions. The developer states it was made with love and offers an optional donation link for support.

### What devices does Frequency Detector Tool support?

Frequency Detector Tool is available on iPhone, iPad, and Apple Vision Pro. It is compatible with devices running iOS and iPadOS.

### How often is Frequency Detector Tool updated?

Frequency Detector Tool was last updated on July 9, 2026, with version 1.0. Given this is the initial release date, future update frequency is not yet established.

### What is the age rating for Frequency Detector Tool?

Frequency Detector Tool has an age rating of 4+. This indicates it is suitable for children and general audiences.

### Can Frequency Detector Tool identify Solfeggio frequencies?

Yes, Frequency Detector Tool includes clickable Solfeggio frequencies such as 432, 528, 639, 741, 852, and 963 Hz. It also provides a note on what each frequency is associated with.

### What kind of music theory facts are included?

Frequency Detector Tool features "Did You Know?" music-theory facts to enhance user understanding. The interface is also inspired by sacred geometry, adding a unique aesthetic.

### How does Frequency Detector Tool help with EQ decisions?

The app provides vocal context notes and a full frequency chart across octaves 0-7. This allows users to see every note for boosting and cutting within their chosen key, guiding EQ adjustments effectively.

## Version history (last 1 release)

### 1.0 — 2026-07-09

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-06.*