Decibel X PRO: Sound Meter

729 reviews
Content rating
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About this app

"Decibel X PRO" is one of very few sound meter apps on the market that has highly reliable, pre-calibrated measurements and supports frequency weightings: ITU-R 468, A and C. It turns your phone device into a professional noise meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be an essential gadget for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? "Decibel X PRO" will help you answer all of those.


- Trusted accuracy: the app is carefully tested and calibrated for most devices. The precision is matching with real SPL devices
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Spectrum analyzer: FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter: NIOSH, OSHA standards
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, etc.).
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design


- Standard time weightings (Response Time): SLOW (500 milliseconds) and FAST (200 milliseconds)
- Trimming calibration from -15 dB to 15 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
- "Keep Device Stay Awake" option for long duration recording
- Reset and clear current recording at any time
- Pause/Resume at any time


- Please do not expect a quiet room reading will be 0 dBA. The range 30 dBA - 130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although most devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. To calibrate, you will need a real external device or calibrated sound meter as a reference, then adjust the trimming value until the reading matches with the reference.

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Updated on
Nov 19, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity and App info and performance
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

702 reviews
Jeffrey Witzel
June 19, 2021
On saved data cannot open each chart. Can not go to point on graph and see reading at that point. They can not be expanded or enlarged to actually see any saved data. Paid for and feel I wasted $, looked good in store but after getting data it is useless. Only good for momentary levels and you must be looking at it, after you look away no way of seeing earlier readings, only a small fuzzy graph with no way of selecting points for data.
9 people found this review helpful
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Jai Cabryizky
July 15, 2022
Very useful, versatile, and informative app. I bought the pro Version of this app so that I could measure the noise output on my welder and the water cooler for my TIG torch, which were fairly noisy. My intent was to shave off as many decibels as possible without compromising performance in in order to avoid pissing off my neighbors. This app helped me shave off a solid 12 decibels, a noticable difference!Thanks
7 people found this review helpful
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SkyPaw Co., Ltd
July 17, 2022
Thank you for your kind words. We are glad that you like our App.
Tom Devlin
April 26, 2022
Installed in a Pixel 4a. Recently after closing the app there is an icon in my notification bar and a green light next to the time readout on the same bar. If I let this persist then the battery drains very rapidly and the phone gets warm to the touch. The only way I have found to stop this is to force stop the app. I have uninstalled and reinstalled the app. Help.
6 people found this review helpful
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SkyPaw Co., Ltd
April 27, 2022
Thank you for your feedback. For your specific case, you might set the option "Keep running when app closed" to ON so the app consumed more energy. if you do not need to keep the app measuring all the time you may consider setting that option to OFF to have the usual battery efficiency.

What's new

∿ Support Android 14
∿ Reduce app size and optimize performance
∿ Components upgrade
∿ Various performance improvements and minor bug fixes