How loud is it here, really?
NoiseLab is a sound level meter that tells you what it knows. It measures the way the standards do: A-, C- or Z-weighting (IEC 61672), Fast and Slow, LAeq over the whole session, Lmax and Lmin, L10, L50 and L90, the unweighted peak, and whether the microphone clipped. Every value is on screen, always free.
What the number means:
- In plain words: like a library, a busy office, heavy traffic, a club floor
- In hours: how long you can stay before the daily limit (85 dB(A) over 8 hours, 3 dB exchange rate, EU directive 2003/10/EC and NIOSH)
- Over time: the level per second as a timeline you can touch, with lines at 70 and 85 dB(A)
- Steady or bursty: L10 against L90 tells you whether it is a hum or a series of bangs
Honest about the phone:
- A phone does not know how loud a pascal is. Uncalibrated, readings can be 5 dB off, and NoiseLab says so on every screen instead of pretending.
- Calibrate once against a reference sound level meter or a 94 dB calibrator: type what the reference reads and the offset stays with this phone.
- NoiseLab asks Android for the raw, unprocessed microphone, so automatic gain control cannot flatten the level it is trying to measure. Phone mics are honest from about 30 to 105 dB; beyond that the app tells you the number is the mic, not the room.
- Pick the input: the built-in mic, a wired headset, a USB interface or a Bluetooth mic.
Private by design: nothing is recorded. The sound passes through the meter and is gone: no file, no account, and only the measurements you save stay on the phone. The one thing that can leave is anonymous usage stats, off by default, which you can switch on or off in Settings.
Free to measure, and your first shareable PDF report is free. Pro (one time) adds unlimited reports, the octave-band spectrum (31.5 Hz to 8 kHz, to tell traffic rumble from tool hiss), side-by-side compares of saved sessions, your own logo on the report and CSV export.
by AudioLab.tools
Sound level meter: LAeq, peaks, exposure hours, calibration in plain sight.