DeciScope

Realtime web sound-level meter — simple, visual, and calibratable.

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dB SPL (approx.) [Unweighted]

Peak: —

Min: —

Max: —

Weighting

Calibration offset (dB)

SPL value assigned to 0 dBFS

Window (ms)

200 ms

Waveform (time domain)

History (last 30s)

Realtime info

Instant RMS → dB calculation (dBFS) plus calibration offset. A-weighting applies frequency-domain weights.

Device / Sample Rate

Not started

Sampling settings

FFT size: 1024 • Update rate from window

Recorded stats

Readings logged: 0
Last saved CSV contains timestamp and dB value.

About accuracy

Browser mic → relative levels. Calibration required for absolute SPL. Environmental factors & mic quality affect accuracy.

Quick actions