Frequency Analyzer

Analyze sound frequency in real time using your microphone.

DOMINANT FREQUENCY
—
Hz
—
Start the analyzer and allow microphone access.
MIN
—
MAX
—
SIGNAL
—
TIME
00:00
Live Frequency Spectrum
20 Hz 100 Hz 1 kHz 10 kHz 20 kHz
Frequency Range Reference
20–60 Hz Very low bass
60–250 Hz Bass
250–500 Hz Low-mid frequencies
500 Hz–2 kHz Midrange
2–4 kHz Upper midrange
4–8 kHz High frequencies
8–20 kHz Very high frequencies
Reference ranges describe frequency regions only. Actual microphone response varies by device.
Advanced Settings
Frequencies below this value are ignored when finding the dominant frequency.
Higher sensitivity detects quieter tones but may also respond more easily to background noise.
How the Frequency Analyzer Works

The analyzer uses your device microphone and the browser Web Audio API to divide incoming sound into individual frequency components. The strongest component is shown as the dominant frequency.

The displayed musical note is calculated from the detected frequency using A4 = 440 Hz as the tuning reference.

Frequency detection is suitable for general analysis, education, instruments, speakers and preliminary diagnostics. Microphone response varies by device, especially at very low and very high frequencies.