Noise Meter - dB, Noise, Log

Measure it. Record it. Put it on paper.

Saying it was loud is easy to dismiss. A document that says how many decibels, at what time, for how long, is not. Noise Meter measures everyday noise in decibels, records it, and turns every session into a one page measurement report you can hand in.

[While you measure]
- A live waveform and gauge show how loud it is right now.
- Peak level (Lmax) and 1 minute and 5 minute equivalent levels are calculated as you record.
- Day limits (06:00 to 22:00) and night limits (22:00 to 06:00) are applied automatically. Night is 5dB stricter.
- Tap a source button the moment you hear it (footsteps, dragged furniture, a dropped object) and it is marked at that exact point.
- Recording keeps running with the screen off.

[Calibration that fits your phone]
Microphone sensitivity differs by device. One 10 second calibration gets your numbers right, and the offset used is printed on the report so whoever reads it knows the conditions.

[One page that holds up]
- Time, day or night band, place and device in the overview.
- Measured values next to the limits, with a clear over or within verdict.
- A SHA-256 hash of the audio file, so you can show the file was not altered.
- Export to PDF and the share sheet opens. Mail it, print it or save it.

[Patterns that appear over time]
- A weekday by hour heatmap shows when it keeps happening.
- Weekly trend, over limit ratio and source breakdown at a glance.
- Put two recordings side by side and see exactly what changed.
- Filter for night only or over limit only.

[What to do next]
Step by step guidance on who to tell first, what to prepare and where to file.

[Your recordings stay on your phone]
No sign up, no login. Audio and measurements are stored on the device only and are never sent to a server. Check how much is stored and wipe all of it in one tap.

[Also]
Korean, English, Japanese, French and Spanish. Light and dark themes. Screen reader labels on every screen.

[Please note]
Values come from the built in microphone and may differ from a certified sound level meter (IEC 61672). For official measurements use your local authority noise service and treat these records as supporting evidence. Recording a conversation between other people that you are not part of may be illegal where you live. You are responsible for what you record and how you use it.