Fonomo: Sound & Decibel Meter

busydrivers

About this app

Fonomo is a sound level meter for people who need more than a number: weighted decibels, the average that reports use, the frequency picture and a record of the whole session.

MEASURE
• dB(A), dB(C) or dB(Z) weighting with Fast or Slow response
• Leq (energy average), Lmax, Lmin and peak, live
• Octave spectrum from 31.5 Hz to 16 kHz, with the loudest band named
• Reference scale with hearing-risk zones and the safe time at the current level

RECORD SESSIONS
• Timed sessions log the level every second (numbers only, never audio)
• Sessions keep the screen on while Fonomo is open, so no second is missed
• Noise dose and TWA under NIOSH (85 dB(A), 3 dB) or OSHA (90 dB(A), 5 dB)
• Level-over-time chart, L10 and L90 in your history
• Share any session as a CSV file or a PDF report
• Alert above your own limit: the reading turns red and the phone vibrates

CALIBRATE
• One offset per phone, −40 to +40 dB in 0.1 dB steps, applied to every reading, chart and report
• Clear steps for three references: a sound level meter, a 94 dB calibrator or a calibrated second phone

YOURS, PRIVATELY
• One purchase: no ads, no subscription, no in-app purchases, no account
• No internet permission. Audio is processed on the phone and never recorded, stored or sent
• Music and other apps keep playing while you measure
• English, Spanish, Portuguese, Hindi and Russian

Your data is backed up to your own Google account.

Honest limits: readings are indicative. A phone is not a certified sound level meter or dosimeter; most phone microphones lose accuracy below about 35 dB and stop near 90–100 dB, and Fonomo shows when that happens.
Refunds follow Google Play's refund policy. Something does not work on your phone? Write to [e-mail].

What’s new

New: choose the app language in Settings (English, Español, Português, हिन्दी, Русский).