Decibels vs Noise Diary

Decibels is a sound level meter that remembers what you measured. Point it at the noise, press start, press stop — and the reading stays. Average (Leq), maximum, minimum, duration and the full level trace, saved automatically, every time. No account, no subscription, and nothing leaves your phone unless you send it. MEASURE • A-weighted (dBA) or unweighted, per IEC 61672 • Fast (125 ms) and Slow (1 s) time weighting • LCpeak for impulses — alarms, slams, machinery • Live level trace with a ten-second window • Calibration offset for matching a reference meter KEEP • Every measurement saved automatically • History with the full trace of each run • CSV export carrying the settings it was taken under Decibels stores your measurements on your device and nowhere else. It records no audio — only the level — and asks for no location, no account and no identifiers. A note on accuracy: a phone microphone is not a calibrated instrument. Decibels is honest about that. Use the calibration offset against a reference meter for absolute readings, and treat it as an excellent relative instrument otherwise.

Noise Diary is a focused tool for measuring environmental sound and saving the moment as a noise event. What you can do: - See an approximate dB(A) reading - Start and end an event to save Leq, maximum, and minimum - Add a tag and notes - Review a local timeline - Export CSV and PDF - Apply local calibration using a reference sound level meter - Continue only an event you started while the screen is locked or another app is open Privacy first: - Analysis runs on your device - No audio recording is created - Audio and measurements are not uploaded - No background measurement outside an event you start Important: Readings are approximate values calculated from the iPhone microphone. Noise Diary is not an IEC-compliant professional sound level meter. Do not use it for legal, health, hearing-safety, or workplace-compliance decisions.