サウンドチェッカー vs Decibel Kit

What's the noise level around you? Sound Checker measures ambient noise levels in real-time using your phone's microphone. - Check apartment noise from neighbors - Measure snoring or teeth grinding volume - Monitor noise at construction sites or events - Check sound levels in your baby's room - Measure quietness of cafes and offices Features: - Real-time dB measurement with large meter display - 30-second waveform graph - Measurement history (min/avg/max dB auto-saved) - WHO noise level guidelines & Japan environmental standards Your microphone is used only for measurement. No audio data is stored or transmitted. Completely free with all features available. Note: This app provides approximate noise level readings using your smartphone's microphone. For legal evidence or precise measurements, please use a professional sound level meter.

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.