Frequency Detector Tool
Find the musical key of any Hz
Free · Designed for iPad. Not verified for macOS.
A frequency tool for mixing & mastering. Use your ear to find the frequency to cut/boost, add the key of the song, the tool gives you the closest mathematical frequency.
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.
Ratings & Reviews
The developer, Eye Heru, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Eye Heru
- Size
- 9.9 MB
- Category
- Music
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © 2026 EyeHeru369.com