Decibel X: Sound Level Meter

Aderikho Artem

In-app purchases

About this app

A sound level meter that tells you what the number means.

Most people do not know what 85 dB is, but everyone understands "protection needed, about fifteen minutes at this level". Decibel Meter measures the sound around you and answers the question you actually came with: is this loud enough to matter, and for how long.

MEASURE LIKE AN INSTRUMENT
• A and C frequency weighting, the same options a real meter has
• Fast and Slow response, with the IEC time constants
• True peak and overload detection
• Max hold and freeze, for a number that stops moving while you read it
• A calibration trim, if you own a reference meter and want to match it

PROTECT YOUR HEARING
Noise damage is a matter of level and time together, so the app tracks both. The dosimeter follows the published NIOSH and OSHA limits: 85 dB for eight hours, halving the allowance every 3 dB. You can see how much of the daily allowance a session used, the time-weighted average, and how long you spent at 85, 88, 91, 94 and 100 dB.

FIND WHAT IS MAKING THE NOISE
A hum sits in one or two frequency bands. The live third-octave spectrum analyzer shows all of them and names the loudest, which is how you tell a fan from a compressor from the bass next door — useful for HVAC, home appliances, machine rooms and flats with thin walls.

SEE THE LEVEL OVER THE PICTURE
The camera screen puts the live reading over what you are pointing at, so you can see the level and the source in the same frame.

KEEP WHAT YOU MEASURED
Every finished measurement is saved with its chart, its average, its peaks and its duration, and you can add a note. Useful when you are documenting a problem rather than just satisfying curiosity — a neighbour's stereo, a workshop tool, road noise before you sign a lease, two machines compared before you buy.

MEASURE WITH THE SCREEN OFF
Background monitoring keeps the meter running while you work, commute or sleep.

WHO USES THIS
People protecting their hearing at gigs, in workshops and on job sites. Engineers and HVAC technicians checking which machine is over the line. Sound engineers keeping a room in range. Teachers, parents, and anyone who wants to be sure they are not the loud neighbour.

HONEST LIMITS
Phone microphones vary, and this is not a certified Class 1 or Class 2 instrument. The app ships with a measured calibration and tells you when the level is at the limit of what the microphone can hear, rather than inventing a number. Use it for personal awareness and general monitoring, not for legal or medical purposes.

NO ADS
The free version measures the live level and the live spectrum, with no time limit and no advertising. A subscription or a one-time purchase unlocks the instrument controls, saved results, reports, alerts and background monitoring.

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