Decibel X: dB, dBA Noise Meter

Decibel X: dB, dBA Noise Meter

By SkyPaw Co. Ltd

  • Category: Utilities
  • Release Date: 2011-11-05
  • Current Version: 8.0.4
  • Adult Rating: 4+
  • File Size: 42.50 MB
  • Developer: SkyPaw Co. Ltd
  • Compatibility: Requires iOS 9.0 or later.
Score: 4.5
From 59,597 Ratings


"Decibel X" is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be a great tool 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. WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS: - Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices - Apple Watch support: see noise level right from your wrist - Frequency weighting filters: ITU-R 468, A, B, C, Z - 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 + iCloud support which synchronize all history records across your Apple devices + Fullscreen mode to give overview the whole history of an record - Dosimeter with NIOSH, OSHA standards - 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. - WAVE graph with 2 display modes: Rolling & Buffer - InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.). - Support both Portrait and Landscape layouts - Beautiful, intuitive and carefully crafted UI design - Optimized for iOS 11 OTHER GREAT FEATURES: - 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 - 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 - Tap on Max value to reset at any time - Pause/Resume the tool at any time NOTES: - Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA. - Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference. Get Decibel X Premium and enjoy: - Permanently remove all advertisements - Unlock ITU-R 468, A, B, C frequency filters - No limits when saving data * Choose from different subscription options. Our standard subscription options are: 1-month Subscription 1-year Subscription * Subscription payments will be charged to your iTunes account at confirmation of your purchase and upon commencement of each renewal term. Subscription with a free trial period will automatically renew to a paid subscription. You can cancel your subscription or free trial in the iTunes settings at least 24-hours before the end of the free trial period. The cancellation will take effect the day after the last day of the current subscription period and you will be downgraded to the free service. * Please note: any unused portion of a free trial period (if offered) will be forfeited when you purchase a premium subscription during the free trial period. * Privacy Policy: * EULA:



  • Not Actually Free

    By Eddie Thurmon
    You have to pay a subscription which is even worse than just having you pay for the app.
  • Caution Advised

    By So Cal Steve
    I have been attempting to stop billing for this app for three months unsuccessfully. My recommendation is steer clear of any subscription here
  • Garbage, manipulated you into upgrading

    By ajdunn83
    As part of the set up screen, the app had a series of welcome screens with a big blue button in the bottom “next” “next” the last one is subtly a “free trial” button. They are intentionally trying to trick people who haven’t even used the app to pay them monthly.
  • Keeps crashing

    By uasc2
    Can it be fixed to stop creshong?
  • Perfect

    By Platoh
    I mean it does it’s job very well
  • App rotation on iPhone 11pro max

    By 3140sandrock
    I notice that on the new iPhone 11pro max the app does not rotate as it did on my previous iPhone 6! When I use the ap the iPhone mike is facing my chest which I feel muffles the sound hitting the mike. I would like to see the app be rotatable so I can have the iPhone mike facing into clear space while having the app right side up. It would be so nice if you could make that change? Regards, Ian
  • Too dark

    By Rab453/
    Must must upgrade
  • SUBSCRIPTIONS are for fools.

    By LosAngeles90631
    DONT PAY SILLY SUBSCRIPTIONS. You will never get the use you think you’ll get, AND YOU STILL PAY!
  • Amazing that this app exists, thanks

    By zzzxxx2019
    Downloaded this to check the decibel of the music my neighbor was playing outdoors. It was vibrating inside my house, i could hear it in every room of my house even with all the windows closed. Neighbors complained to the police, even after the police made them turn it down it still registers between 42-47.
  • Essential audio metering app

    By whatnowIneedanicknameaargh
    I use and recommend this app. One feature request though, now that we have spectrum analysis available, can there be an option to see the graph in logarithm scale