About

A simple tool that does one thing well.

Noise Decibel Meter is a free, browser-based sound level meter built for anyone who needs a quick, accurate decibel reading — without installing an app, creating an account, or giving away personal data.

Why we built it

Existing decibel meter apps often require installation, request unnecessary permissions (contacts, location, camera), or are buried under ads. We wanted something different: open your browser, click one button, and get a reading. No friction. No tracking.

The tool uses your browser's Web Audio API to process microphone data entirely on your device. No audio is ever transmitted to a server — your measurements stay completely private.

What it does

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Real-time dB readings

Live gauge and numeric display updated every animation frame.

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dBA & dBC weighting

Switch between A-weighted (human hearing) and C-weighted (low-frequency) modes.

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60-second history

Visual waveform graph tracks noise levels over the last minute.

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CSV export

Download a timestamped log of every reading for documentation.

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Dark mode

Full dark theme that respects your system preference.

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Privacy-first

All processing is local. No server, no storage, no analytics on audio.

Accuracy

Browser-based decibel meters are accurate enough for everyday use — typically within ±2–3 dB — making them excellent for trend monitoring, noise complaints, and general awareness.

For legally compliant occupational safety assessments (OSHA, ISO 61672), a certified hardware sound level meter is required. Phone microphones are not factory-calibrated to those standards.