NoiseLedger: Decibel Meter

iOS app by lapnito.cz s.r.o.. Utilities · lapnito.cz s.r.o.

Store rating
5 / 5
Store rating count
1
Download price
Free to download
In-app purchases
Unknown
Version
2.0
Listing last refreshed
2026-09-10

View the original store listing

Store description excerpt

NoiseLedger is a privacy-first decibel meter and noise log for iPhone. Measure sound levels in real time, run overnight recordings, and export professional reports — with no ads, no account, no subscription, and no cloud. MEASURE WITH CONFIDENCE • Real-time dB with FAST/SLOW response, MIN / Leq / MAX • A, C and Z frequency weighting • iOS measurement mode: audio processing is switched off so readings are not altered • Calibration wizard plus built-in offset profiles for ~30 iPhone models • Honest clipping detection warns you when the mic reaches its limit PRO METRICS, COMPLETELY FREE • Noise dosimeter to NIOSH (85 dB, 3 dB) and OSHA (90 dB, 5 dB) standards • Live dose %, TWA and time-to-limit projection • Percentiles L10 / L50 / L90 / L95 • Time above threshold and a full dB histogram SEE THE SOUND • FFT spectrum with peak frequency readout • Scrolling spectrogram (waterfall) • 31 third-octave bands with peak hold DOCUMENT AND PROVE IT • Multi-page PDF report: chart, statistics, percentiles, dose and a threshold-exceedance table with start, end, duration and max • CSV and PNG export • Overnight and long-session recording with adaptive sampling, auto-stop timer and a quiet night preset • Session history with search, date and dB filters, tags, notes and markers • Trends dashboard: daily Leq, streaks, loudest day and hour PRIVACY BY DESIGN Audio is analysed live and never recorded or stored. No accounts, no analytics, no trackers, no cloud. Everything stays on your iPhone. You can erase all data at any time from Settings. ACCURACY NOTE NoiseLedger uses the built-in iPhone microphone, so readings are approximate and vary by device. It is a helpful indicator, not a certified instrument. For legal, workplace-compliance or safety-critical measurements, use a calibrated Class 1 or Class 2 sound level meter.

Review coverage

AppRill has captured 0 reviews for this app. This is a collected sample, separate from the store rating count. Latest review capture: Not captured yet.

Recent captured chart positions

No chart positions have been captured for this app yet.

Chart position, rating count and review coverage do not establish downloads, revenue or profit. Understand the differences.