Decibel X - Pro Sound Meter

Contains adsIn-app purchases
6.84K reviews
Content rating
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About this app

"Decibel X" 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 sound meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful sound meter 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" 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.).
- Beautiful, intuitive and carefully crafted UI design


- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) and IMPULSE (50 milliseconds)
- Trimming calibration from -50 dB to 50 dB
- Standard measurement range from 20 dBA up to 130 dBA
- Spectrogram
- 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
Jan 10, 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
Location, App activity and 2 others
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted
6.84K reviews
Michael Laird
October 27, 2022
Drains battery and uses microphone when it is paused and is in the background. I paused the app and switched to something else only to find that my microphone was still in use and my battery was critically low. I had to close the app to get it to stop taking over the system. Edit: I'm glad there's an option to stop the app from running in the background, but if I hit pause, it should stop regardless of that setting. The current design is still quite problematic.
36 people found this review helpful
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SkyPaw Co., Ltd
October 28, 2022
Thanks for your response. We will seriously consider your feedback and will add the feature in a new update.
Moto Man
September 24, 2022
it's pretty good, accuracy seems adequate and I do like it. but for some reason it causes my phone to overheat and it drains my battery. I already set the response time to low but it still happens. I don't know if this is normal or not. maybe the ads are causing it. I have to use it for a very short time and force stop the app to conserve battery power. CPUZ shows the P cores are constantly at max frequency until I force stop it, my Galaxy tab S6 does the same thing.
31 people found this review helpful
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SkyPaw Co., Ltd
September 27, 2022
Thank you for your feedback, we will check and tweak the system to make the application work faster, with less resource consumption. We hope to receive your positive feedback on the upcoming system upgrade.
Drew Ryan
November 20, 2020
It's pretty spot on. Out of the box it was about 3 or 4 decibels off. The running graph is very nice if you have to stop to look at the result of your test. The ability to save your tests is very handy and it's ready to go immediately after installation as it requires little initial setup. Its a good application; I'll definitely continue to use it.
51 people found this review helpful
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What's new

∿ Components upgrade
∿ Various performance improvements and minor bug fixes