Noise Meter - Decibel dB Meter

Nightchart is a noise meter and decibel (dB) meter that logs neighbor noise all night — footsteps, music, barking — and checks it against real noise limits.

Neighbor noise, measured against the rules — not just a feeling.

• Judgments against real limits: Korea's apartment noise rules, the UK Noise Act night-time level, or WHO guidelines
• Night Watch logs only the moments over the limit while you sleep
• Incident log: one tap on "Noisy now" saves the time, type and a note
• PDF reports of sessions and incidents, ready to hand in
• A real sound level meter: A/C/Z weighting, Fast/Slow, LCpeak, 1/1 and 1/3 octave bands, NIOSH hearing exposure
• No audio recording by default — optional event sound clips you turn on yourself, with a clear legal warning
• Honest about accuracy: not a certified meter, and it shows you how to calibrate

Measuring and the incident log are always free, and your records are always yours to open and back up. Recording sessions, Night Watch and report PDFs come with a one-time lifetime pass. No subscription, ads or account.

Good for: noisy upstairs neighbors, documenting a noise complaint for your landlord or council, checking sound levels in a room, or protecting your hearing.

Recent changes:
Optimizations and minor bug fixes