Sound Meter dB

Sound Meter dB is a decibel meter and noise detector for your phone: a live dB reading on a color-coded dial, from quiet teal to dangerous red, with a history graph, safe-exposure guidance, a night-long noise log, a hearing test and a frequency analyzer.

Open it and it's already measuring: the party next door, the office air conditioning, the restaurant that "isn't that loud". This dB meter takes ten readings a second, time-weighted like a real sound level meter, and your music keeps playing.

NEW: NIGHT MODE
Leave the phone by the bed, plugged in, and go to sleep. Night mode learns how quiet your room is, then logs every noise above it: when, how long, how loud and what kind of sound. In the morning, a report: the whole night on one chart, every noise marked, the loudest called out, your longest quiet stretch. Made for noisy neighbors, traffic, a barking dog, or whatever wakes you at 3 AM.

NEW: HEARING TEST, HOW HIGH CAN YOU HEAR?
The highest pitch you can hear drops with age. A one-minute hearing test climbs through tones up to 20,000 Hz and shows which age group your ears match. For fun, not a medical hearing test.

NEW: YOUR DAILY NOISE DOSE
How much of today's safe sound allowance have you used? The noise meter adds up every measurement of the day against the NIOSH limit (85 dBA for 8 hours) and shows it as one percentage.

NEW: FREQUENCY ANALYZER (PRO)
Third-octave bands from 50 Hz to 16 kHz and the dominant tone, live, with its musical note. A guide shows what usually makes each part of the spectrum (rumble, hum, whine, hiss), and the analyzer flags electrical hum. Find the source, not just the noise level.

NEW: PDF NOISE REPORTS AND A NOISE DIARY (PRO)
Turn any session into a clean PDF: the chart, the average and the peaks, every noise event, the measurement settings. Or put weeks of nights into one noise diary, the way a landlord, an HOA or the council asks for it: every noise with its date, time, level and type.

MEASURES LIKE A REAL METER
A-weighted readings (dBA), Fast or Slow response, and Leq, the energy average: the same maths as a sound level meter, in a decibel meter app. The dial holds the session peak and turns red past 100 dB. Have a reference sound level meter? Calibrate against it in Settings.

EVERY READING, IN PLAIN WORDS
40 dB is a quiet library, 60 a conversation, 75 a vacuum cleaner, 95 power tools, 110 a rock concert. Following the NIOSH guideline, the noise meter shows how long the current level is safe for and counts the time over 85 dB.

EVERY SESSION, SAVED
Measurements stay on your device with their timeline and loudest moments. Share one as an image, export it as CSV, or make it a PDF report.

FOCUS MODE
The reading as big as the screen, and the whole screen turns red when the room stays above your limit. Made for classrooms, workshops and venues.

PRIVATE, AND WORKS OFFLINE
Sound is analyzed on your device, as numbers. No recording is kept or uploaded, not even in Night mode. No account, no connection needed.

THE HONEST PART
Phone microphones are built for voice, not metrology, and every model hears a little differently. Readings are good estimates for awareness and comparisons, not a substitute for a certified Class 1 or Class 2 sound level meter.

GOOD FOR
- Documenting noisy neighbors, traffic and night-time noise levels
- Checking noise levels at home, at work, in a classroom or workshop
- Concerts and events: knowing when to give your ears a break
- Finding the hum, whine or rumble in a room
- Sleep and study rooms, nurseries and baby rooms

FREE, WITH AN OPTIONAL PRO
Sound Meter dB is a free decibel meter, supported by a small banner and an occasional ad when the app opens. Sound Meter dB Pro is a one-time purchase, not a subscription: it removes the ads and unlocks the frequency analyzer, the full event list in night reports, PDF reports and the noise diary. The dB meter, Night mode, the hearing test, history, sharing and everything else stay free for everyone.

Recent changes:
• Night mode: log the night and wake up to a report of every noise
• Hearing test: how high can you still hear?
• Noise dose: how much of today's safe sound allowance you've used
• Frequency analyzer: find the hum, whine or rumble (PRO)
• Noise diary: weeks of nights in one PDF for a landlord or council (PRO)
• Sound Meter dB Pro: No ads. One-time purchase. No subscription.