Decibel Meter Pro is full of features sound level meter with exclusive accuracy of measurements and integrated spectrum analyzer. Calibrated with professional dB meter.

The world is a noisy place: cars, power tools, crowds, machinery, and other common sources produce amounts of noise that can, with continued exposure, lead to permanent hearing loss. Sound level meters are useful for anyone who wants to avoid exposing their ears to harmful noise levels, but who wants to spend hundreds of dollars on one?

dB Meter is free app which provides professional-quality measurement results, calibrated using an actual Nor140 high-precision decibel meter. With dB Meter, you can measure ambient noise levels, save your measurements and their locations, and share your measurements with others. dB Meter couples utility with stylish design and a polished user experience: a powerful tool in a sleek package, and at a tiny fraction of the cost of professional sound level meters.

(Please note that dB Meter soundmeter app is not a replacement for professional devices and should be used for personal purposes only.)

"The best way to meter sound levels" - AppAdvice

● Saves location data for each measurement.

● Save measurements with custom names and rename existing measurements.

● Export measurements in CSV or Audio format.

● Allows you to save, export and play back recorded measurements.

● Highly accurate measurements.

● Integrated Fully Functional Spectrum Analyzer

● Octave Band Real Time Analyzer

● FFT Plot (Fast Fourier Transform)

● Linear and logarithm scales

● Up to 16384 FFT size

● A lot of available window functions

● Tracking for max value

● Max and Min for any selected frequency

● Stunned graphics

Have any questions or suggestions? Write to us:

App offers an optional monthly and annual subscriptions:
Payment will be charged to your iTunes account at confirmation of purchase. Subscriptions will automatically renew unless autorenew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal in accordance with your plan, within 24-hours prior to the end of the current period. You can manage or turn off auto-renew in your Apple ID account settings any time after purchase. Please note, any unused portion of a free trial period will be forfeited when making a purchase of an auto-renewing subscription. View our Terms of Use here:

DB Chart
150-160 dB = Eardrum rupture
140 decibel = Aircraft carrier deck.
130 dB = Jet take-off (100 meters), gun blast at close range.
120 dB= Human pain threshold, loud rock concert.
110 decibel = Serious hearing damage if sustained for more than 1 hour.
100 dB = Serious hearing damage if sustained for more than 8 hours.
90 decibel = Likely hearing damage if sustained for more than 8 hours.
80 decibel = Potential but unlikely hearing damage if sustained for more than 8 hours.
70 dB = Just annoying, but probably safe.
60 dB= Typical conversational volume.
50 dB = A quiet, library conversation.
40 decibel = A whisper.
30 dB= Barely audible sound.
20 decibel= Threshold of human hearing.

What’s New

Version 4.6.3

• Fixed issue with silent Noise Dosimeter notification.
• Fixed issue with CSV recording in background mode.
• New feature to reset daily noise dose from the settings menu.
• Now you're able to select to keep receiving noise notifications one after another.
• Various stability improvements

Please be sure to rate this new version on the App Store and leave a review.
Your feedback is greatly appreciated and helps us continue updating dB Meter!

Ratings and Reviews

4.6 out of 5
12.5K Ratings

12.5K Ratings

Julie12345678910111213 ,

Accurate as a phone app can get

Thank you for this app. I was looking for something that could give me a general idea of the sound dB ranges in different locations. Since I only needed a general range for this project I looked for a free or low cost app. It worked better than I expected a phone app would be able to.
I felt the need to leave a review as I am surprised at the amount of people that left negative reviews. The iPhone mic is quite different than a calibrated device that cost $100 and up. Not to mention variances in cases, dirt build up, people’s hand placement, even the direction the mic is being pointed at could slightly alter results. All that said this was accurate within 5db up or down in my results. Considering all I mentioned above that is pretty good. If you need something highly accurate for something of importance you should be looking into an calibrated device made for such things.

Developer Response ,

Thank you so much for your positive feedback. It's inspired.

Smurdamat2 ,

So far so good!

I purchased the pro version as I am an audio engineer and would like to have something convenient as a quick reference rather then pulling out my larger, more professional tools. So far this has been pretty accurate and quite helpful. I would like to see some adjustability on the “over limit” marker. There are times I am given a dB limit to follow and being able to set this for when the meter reaches “over” would be nice. Maybe even some other larger notification and options to turn this on and off? A couple tweeks and this app would be amazing! Solid product for sure!

Developer Response ,

Hi, thank you for your feedback. Such a feature released with a new dosimeter mode. You can tap on bell and setup your own noise alerts as you described.

AcousticsPro ,

Not very accurate...

Despite claim that it is calibrated with a professional sound level meter, I found the measurements to be consistently 5-7 dB higher than my trusted B&K 2250. That is way higher than accepted error reported by standards and the main NIOSH hearing group study on smartphone apps accuracy. There aslo no documentations or papers to support the claim of accuracy.

Another flaw: Peak level should never be lower than max level, yet in this app, it seems that Max is sometimes higher than Peak. Maximum sound levels are averaged over the time period it's measured at while Peak is the absolute highest level captured by the microphone before any averaging or RMS calculations.

Finally, what is the average displayed? Averaged based on what criteria? Most sound level measuring instruments have a threshold value as specified by a threshold level and an exchange rate, yet this app does not provide any such information. A calculated "average" is really useless without these parameters.

Developer Response ,

Thank you very much for your detailed feedback. First of all i would like to discuss your vision of the app if it's possible via you can help to improve the app. And below my answers on your comments.

The app being calibrated with Nor130 Class 1 precision sound level meter. Unfortunately the internal mics are not so sensitive and trim some frequencies so i need to compensate them programmatically. That's why you might notice some differences with your B&K. And you should see the difference since its not a Pro hardware tool for 2500$+. However the app shows only 3% error on 1000 samples next to cheap hardware soundmeters 100$+. That's the main reason i develop this app to provide everyone ability to test noisy environment on the level of class 2 precise devices free of charge.

It's a basic tool with some advanced features. Thats why i implement it the way users would like to see it. Max is the max for most of people. And Average is just average. But i should rename Peak to Current. You're absolutely right. I'll do this with upcoming updates.

Please write me at to discuss the way i can add some pro features to the app. Thank you for your feedback once again.

In-App Purchases

Spectrum Analyzer Pack
Full access to FFT, Spectrogram & Octave RTA
Decibel Meter Pro
Save. Export. Get access to dB-A, C, Z
Noise Dosimeter Pro
Get notifications & measure in background
dB Meter Premium Pack
Lifetime access to all features


Vlad Polyanskiy
20.8 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Japanese, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese

Age Rating
Rated 4+
© Vlad Polyanskiy
In-App Purchases
  1. Decibel Meter Pro $9.99
  2. dB Meter Pro $9.99
  3. Spectrum Analyzer Pack $24.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like