Decibel Kit: Noise Dosimeter

About this app

Decibel Kit is a buy-once acoustic measurement kit that brings a sound level meter, spectrum analysis, a dosimeter and evidence reports together in one app. There is no subscription. ■ Live measuring is all free — and never stops The dB meter, spectrum (FFT / RTA / octave bands / spectrogram), the NIOSH / OSHA dosimeter, the learning content and the camera dB overlay are free from the start, with no count or time limits. ■ One-time purchase, no subscription "Pro" is yours forever after a single purchase. No monthly or yearly fees. We never take back a feature you have already unlocked. There is just one purchase screen, and you can close it anytime with the ×. ■ What Pro adds (keep it, prove it, export it) • Save recordings and history (with audio) • Export to PDF / CSV / WAV / HTML • Save evidence photos and videos • Save calibration profiles • iCloud sync and Health integration • Apple Pencil annotation, Before/After compare, trimming ■ Professional analysis A / C / Z / B / ITU-R 468 weighting, Fast / Slow response, Leq, L10, L90, TWA, peak hold, 1/1 to 1/24 octave bands, adjustable ranges. ■ Numbers you can trust Save device-specific calibration profiles for free, with a "±N dB" confidence range always on screen. ■ Strong as evidence Photos and videos with dB, date/time and location burned in, your own notes, a tamper-evident SHA-256 hash, and a region-aware noise-regulation guide — all in one report. Great for neighbor, construction and workplace records. ■ Measure without stopping your music Measure while music, AirPlay or Bluetooth keeps playing. ■ On iPhone, iPad and Mac Universal. On large screens you can view the FFT / RTA / spectrogram side by side. * This app provides hearing-safety guidance only and is not a medical device. It cannot be used for diagnosis or treatment.

Minor improvements and stability fixes.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 20, 2026 · 9:24 PM Free