Frequency Detector
Detect the real-time pitch and musical note of your voice or instrument.
Advanced Settings
Detect Real-Time Pitch and Musical Notes
The Frequency Detector is a browser-based tool that measures the real-time frequency (Hz) of your voice or instrument and instantly converts it into the nearest musical note. It also displays tuning accuracy, tracks your session statistics, estimates your vocal range, and visualizes your sound with a live waveform.
Whether you’re practicing singing, tuning an instrument, or learning about sound frequencies, the tool provides accurate pitch detection without requiring any software installation. Everything runs directly in your browser using your device’s microphone.
How to Use the Frequency Detector
Using the tool only takes a few steps.
- Click Start Listening.
- Allow microphone access when prompted by your browser.
- Sing a sustained note or play a single note on your instrument.
- Watch the live frequency, musical note, and waveform update in real time.
- Review your session statistics and estimated vocal range.
For the best results, use the detector in a quiet room and produce one note at a time.
If you want a dedicated tuning interface with visual cent indicators, try the Pitch Detector.
What the Frequency Detector Displays
The detector provides several real-time measurements.
| Result | Description |
|---|---|
| Frequency (Hz) | Displays the detected fundamental frequency. |
| Musical Note | Converts the frequency into the nearest note. |
| Cents Offset | Shows how sharp or flat the detected pitch is. |
| Waveform Display | Visualizes your incoming audio signal. |
| Minimum Frequency | Tracks the lowest frequency detected during the session. |
| Maximum Frequency | Tracks the highest detected frequency. |
| Estimated Vocal Range | Estimates the closest classical vocal category based on your session. |
| Copy Results | Copies the current analysis to your clipboard. |
These measurements help singers, musicians, and students better understand their pitch and tuning accuracy.
Accurate Pitch Detection
The Frequency Detector uses a time-domain auto-correlation algorithm to identify the fundamental frequency of monophonic sounds.
Unlike simple frequency analyzers, auto-correlation is especially effective for human voices because it focuses on the fundamental pitch rather than higher harmonics.
Once the frequency is detected, the calculator converts it into the nearest musical note and computes the tuning difference using cents, allowing you to see whether your pitch is sharp or flat.
If you’re interested in converting frequencies manually, the Hz to Note Converter provides detailed note and tuning calculations.
Session Tracking and Vocal Range
As you continue speaking or singing, the detector records useful session statistics.
These include:
- Lowest detected frequency
- Highest detected frequency
- Estimated vocal range
The vocal range estimate compares your detected frequencies with common classical voice categories such as Bass, Tenor, Alto, and Soprano. It provides a general reference rather than a complete vocal assessment.
For a more comprehensive voice classification, you can use the Vocal Range Test or the Voice Analyzer.
Noise Gate and A4 Reference
The detector includes adjustable settings to improve accuracy.
Noise Gate
The Noise Gate filters out quiet background sounds such as fans, computer noise, or room hum before pitch detection begins.
Increasing the threshold can improve stability in noisy environments, while lower settings work well in quiet rooms.
Adjustable A4 Reference
By default, the detector uses A4 = 440 Hz, the international tuning standard.
You can adjust the reference anywhere between 415 Hz and 460 Hz, making the detector useful for historical tunings or alternative concert pitch standards.
Privacy and Browser Processing
The Frequency Detector is designed with privacy in mind.
All microphone processing occurs locally through the browser’s Web Audio API. No audio recordings are created, uploaded, or stored on external servers.
When you stop the detector, the microphone stream is immediately closed.
Because the detector analyzes a single pitch at a time, it performs best with:
- Solo singing
- Whistling
- Single guitar strings
- Individual piano notes
- Other monophonic instruments
It is not intended for analyzing full chords or multiple notes played simultaneously.
If you’d like to learn more about vocal frequencies, the Voice Frequency Range article explains common frequency ranges for different voice types.
FAQ
What does the Frequency Detector measure?
It measures the fundamental frequency (Hz) of your voice or instrument and converts it into the closest musical note with tuning information.
Does the tool record my voice?
No. The Frequency Detector processes audio locally in your browser and never records, stores, or uploads your microphone audio.
Can it detect chords?
No. The detector is designed for single-note (monophonic) audio sources. Multiple notes played at once can reduce accuracy.
Why should I adjust the Noise Gate?
The Noise Gate helps reduce interference from background sounds, improving pitch detection in noisy environments.
Can I change the tuning standard?
Yes. You can adjust the A4 reference between 415 Hz and 460 Hz if you use an alternative tuning standard.