dB Logger
Free Sound Level Meter
GET
Free Sound Level Meter

Measure what's really there.

dB Logger turns your phone into a professional sound level meter, frequency analyzer and noise logger — capturing raw, unprocessed audio for true dBA, dBC and dBZ, a live spectrum, NR/NC ratings, and lossless logging. Free on iPhone and Android.

Download on theApp Store Get it onGoogle Play
dB Logger app icon
dB Logger sound level meter app screenshot
Features

Built for real measurement

Measurement Integrity

Captures raw, unprocessed audio — bypassing the OS echo-cancellation, noise-suppression and auto-gain that distort every other phone meter.

Professional Metrics

Real-time dBA, dBC and dBZ with Fast/Slow/Impulse weighting, plus Leq, Max, Min, Peak and NR/NC single-figure room ratings.

Live Analysis

A live FFT spectrum from 20 Hz to 20 kHz, a 1/1 and 1/3-octave equalizer, a scrolling time-history graph and an analog dB meter gauge.

Log & Report

Log metrics to CSV and raw audio to lossless WAV, then generate and share PDF or CSV reports. On-device and private — no account.

What you can measure

A full acoustics toolkit

Weightings

A, C and Z frequency weighting with a selectable update rate from 200 ms to 10 s.

dBA · dBC · dBZ

Spectrum

A live FFT from 20 Hz to 20 kHz with a peak-hold envelope and a peak-frequency readout.

20 Hz–20 kHz FFT

Octave Bands

A 1/1 and 1/3-octave equalizer with per-band peak caps for detailed frequency analysis.

1/1 & 1/3 octave

NR / NC Ratings

Noise Rating and Noise Criteria single-figure ratings from octave bands — ideal for HVAC and room work.

NR · NC
How it works

Measure in three steps

1

Pick your input — the built-in microphone or a USB-C measurement microphone.

2

Read live levels, spectrum, octave bands and NR/NC, with a Safe / Loud classification.

3

Record to log metrics and lossless audio, then export a report to share.

Screenshots

See it in action

dB Logger dB meter gauge showing the current sound level
dB Logger live FFT spectrum from 20 Hz to 20 kHz
dB Logger time-history graph of sound level over time
Platforms

On the device you already carry

Free on iPhone and Android. Use the built-in mic or plug in a USB-C measurement microphone. A one-time purchase unlocks the full version — unlimited recording, export and video, with no ads and no subscription.

iPhone iPad Android Phone Android Tablet USB-C Microphone

Measure what's really there.

Download dB Logger free and turn your phone into a sound level meter.

Download on theApp Store Get it onGoogle Play

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