Numbers instead
of “it’s loud”
Measure the noise around you in decibels with your phone’s microphone, then compare the record against a baseline and keep it as a document. When it was loud, and how loud, stays in a table and a chart.
What Sound Meter does
Measure it, keep it, compare it, turn it into a document.
Real-time decibel meter
Levels are A-weighted, the way human hearing responds. You get the 1-minute equivalent level (Leq) and the maximum (Lmax) alongside min, average and max.
Saved sessions
Stop, then save, and the measurement becomes a session. Note the place and the noise type (footsteps, doors, TV…) and you can filter by type later.
Reports by period
Days, hours and noise types are collected into a pattern. Daytime and night are compared against the baseline separately.
PDF report
Export a PDF with the dates, the statistics and the baseline comparison. The microphone calibration used is printed for each session.
Optional recording
Turn it on in settings to save audio as m4a while measuring. It is off by default, and saved files stay on your device.
50 languages
Pick the app language independently of your phone. Raw measurement data can be exported as CSV.
How it works
Three steps is all it takes.
Measure and save
Tap to start when it gets loud, then stop and save. Note the place and noise type and the report counts them for you.
Choose a baseline
Pick what to compare against. Daytime and night are calculated separately, along with how many days went over the line.
Keep the document
Export a PDF when you need one. If you want the raw numbers, CSV works too.
Baselines to compare against
Provided for reference — you can also read the levels with no baseline at all.
⚠️ Worth knowing — this is not an official measurement
The app shows a reference value taken with a phone microphone. Microphone sensitivity differs between devices and is affected by where the phone sits and by its case. That is why settings let you adjust a calibration offset of ±10 dB, and why the report prints the offset that was applied.
It does not replace a certified sound level meter, and the app does not judge whether any law has been broken. An official determination is only possible through measurement carried out by the method the law prescribes. See Article 8 of the Terms for details.
Privacy & terms
There is no account. Measurements and recordings are stored on your device only and are never uploaded. You can delete records individually in the app, and removing the app removes them all. Ads (Google AdMob) use the advertising identifier, device information and a coarse, IP-derived location — the Privacy Policy explains what is collected and how to turn tracking off.