Usetulvo Sound Meter: Decibel

Usetulvo Sound Meter shows how loud it is around you, right now. A decibel meter and noise meter in one, for everyday sound levels at home, at work, in traffic or at a concert. It measures with your phone's microphone; the sound is never recorded and never leaves your phone. No account, no ads, no usage limits.

LIVE LEVEL
• The level in decibels on a large dial, from quiet to harmful
• Minimum, average (Leq) and maximum, with the time measured
• A graph of the last minute
• How long that level is safe for your ears each day (NIOSH: 85 dB(A) for 8 hours, 3 dB rule)
• A warning when a sound is too loud for the microphone

FREQUENCY BANDS
• Ten octave bands from 31.5 Hz to 16 kHz, live
• The dominant frequency, with a hint at what it may be: hum, traffic, speech, alarms or hiss
• Optional peak hold on every band

SAVE AND LOOK BACK
• Save a measurement with its average, minimum, maximum and per-second graph
• Tag where you measured (home, bedroom, work, car, outdoors, concert) and add a short note
• History with a weekly summary: the average of each of the last 7 days and the loudest measurement
• Open a measurement to move through its graph and see the settings it was taken with
• Share a measurement as a CSV file

SET IT UP YOUR WAY
• A, C and Z frequency weighting
• Fast (125 ms) or slow (1 s) response
• Calibrate against a reference sound level meter: type its value and tap Match, or adjust from −30 to +30 dB
• Keep the screen on while measuring

GUIDE
• How loud everyday sounds are, from rustling leaves to thunder
• The safe time per day for each level
• What dB(A), dB(C) and dB(Z) mean, and how accurate a phone can be

PRIVATE
Only the numbers are kept, never the sound, and they stay on your phone.

Available in 21 languages. Phone microphones are not certified instruments: use the readings as a good estimate, not for legal measurements.

GOOD FOR
• Checking whether a neighbour, a bar or traffic is too loud
• Noise at work, at a concert or in a classroom
• Finding the source of a hum or a whine
• Knowing when to wear ear protection
• Keeping a record of noise in your bedroom or at home

Developed by Lunar Code Tech, Netherlands.