Map-based visualization for location-aware monitoring
Open-source under GNU v.2 with transparent development
Free to use with calibration and data sharing
Not intended for professional use; accuracy cannot be guaranteed due to device microphone variability
Requires technical knowledge for proper calibration and interpretation
Data quality depends on hardware and environment and is not a substitute for professional meters
About OpeNoise
OpeNoise is a tools app developed by Arpa Piemonte.
Download Statistics
OpeNoise has been downloaded 96 thousand times. In the last 30 days, the app was downloaded 1.2 thousand times.
User Ratings
OpeNoise is rated 4.36 out of 5 stars. The rating is based on 260 ratings.
App Information
OpeNoise is FREE to download. The APK download size is 11.03 MB. The latest version available is 3.3.0. The last update was on December 9, 2025.
Technical Requirements
OpeNoise requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play May 2016.
Description
OpeNoise is a real-time noise level meter.
TECHNICAL SPECIFICATIONS: - Real-time A-weighted sound pressure level measurement - Minimum and maximum level - Third octave and FFT analysis - Data saving in text file - Calibration - Displaying measurements on a map - Metadata compilation - Sharing calibration and measurements with the OpeNoise community
TERM OF USE This app is not intended for professional use, it does not necessarily guarantee an accurate noise measurement. Since each device has a different response to noise, a comparison with a professional noise level meter in the measurement dynamic range is required. The utilization of the app requires adequate technical knowledge and skill; an extemporary measurement might not be correct. The calibrations and measurements sent to the OpeNoise community will be used for statistical purposes only and cannot be used in any way to verify compliance with legal limits.
CREDITS Developers: Arpa Piemonte (Regional Agency for the Protection of the Environment of Piedmont - Italy - www.arpa.piemonte.it). The code is open source under GNU v.2 license or later, the code is on GitHub: https://github.com/Arpapiemonte/
Recent changes: - performance improvement and minibug resolution
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Great and complete app! I still to calibrate it, but everything seems working well. Extremely appreciated the privacy respect and the source on git ! Gracie agli sviluppatori, ottimo lavoro :)
★★★★☆Mary White· Dec 22, 2023
If "Save LEQ 1/3 octaves levels" and "Save Lzmin 1/3 octaves levels" are checked before the start of the test. The recorded data will be very long. When you open the recorded txt file in the app, when a row of data is too long, I think it is best not to enable automatic word wrapping on the narrow screen of the mobile phone.
★★★★★S M· Oct 1, 2018
Did almost exactly what I needed it to with a clean usable interface. Only complaint is that I can't figure out how to save recorded data. Probably something simple I am missing. Thanks for the great open source app!
★★★★★Elliott· Mar 29, 2024
This app is brilliant, the best by far! It is the only one I have found that can display dB(A) and not just dB(Z). The wide choice of display options is greatly appreciated. I see a lot of people leaving negative reviews on here complaining about the need for calibration, ALL APPS NEED CALIBRATION if they claim otherwise, they are lying! My only wish is to be able to create custom AEQ times as seeing 3, 5, or 15 min averages is very valuable! If you need a sound level app, this is it. 5 starts!
★★★★★David Reeves· May 5, 2024
Probably the best noise and ambient sound measuring app I've ever used that didn't cost me $80.
★☆☆☆☆Stan Senter· Feb 7, 2024
Never opened. Deleted, downloaded, start page, no activity. Deleted.
★☆☆☆☆Chris Marshall· Mar 14, 2025
Doesn't do anything other than countdown to zero. Crashes after opening often.
★★☆☆☆JennPlays93· Mar 20, 2024
In order to calibrate the app you need a professional sound meter. While I love that this app doesn't sell to third parties, this made the app useless for me. I got this app to be able to measure the white noise during my baby's nap times to avoid hearing damage. This just isn't the app I needed for my intended purpose.
Google Play Rankings for OpeNoise
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Technologies used by OpeNoise
OpeNoise is requesting 9 permissions and is using 4 libraries.
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