Decibel X:dB Sound Level Meter

Decibel X:dB Sound Level Meter

By SkyPaw Co. Ltd

  • Category: Utilities
  • Release Date: 2011-11-05
  • Current Version: 8.2.1
  • Adult Rating: 4+
  • File Size: 44.46 MB
  • Developer: SkyPaw Co. Ltd
  • Compatibility: Requires iOS 9.0 or later.
Score: 4.61266
From 65,998 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 - Health App integration: export noise levels directly into Health app. - 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. * 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:



  • No Ad version $$$

    By Eli_084
    The no advertisements version of this app is incredibly expensive 4.99 PER MONTH. There’s no way your ads makes 4.99 a month. $5 ONCE, and then maybe $1 a year for updates 👌. Don’t get unless you’re okay with very obtrusive ads.
  • Works great.

    By LeoR0987654321
    Works great
  • Good App, dishonest billing practices

    By mukkoka
    It’s not a 3 day free trial if you force the user to pay for a new subscription 24 hours before the trial ends. That’s just wrong.
  • Very cool but....

    By link halo 07
    I love this app it is very accurate I like the gage that shows the noise level but there is no way to set up a recording of the sound
  • Handy

    By Digirat
    Person can know when to pull out of a musical event before damage to hearing
  • Pro video feature fails

    By Erika Schanz
    The main feature I was looking for when I paid for this app was the ability to overlay the decibel info over video. This app does that but promises that with the Pro version you can record videos longer than 15 seconds. There is a glitch that doesn’t allow this even after you pay for the app. It just keeps operating like you need to subscribe to Pro and cuts off after 15 seconds. Disappointing and frustrating for the needs I purchased it for.
  • can’t find option to remove ads

    By metr01d
    IAP indicates option to remove ads. However, within the app, you only see a trial subscription for upgraded features. Clicking on the ad icon which i thought may be the way to purchase the no ad IAP, results in a black screen with no way to revert to the previous screen. Had to kill the app and start again.
  • It’s not free

    By paco-7
    It’s not free don’t wast your time
  • pay to use even for the trial

    By 泰书华
    no. im not giving you my credit card for a trial.
  • Was free, was made to upgrade and now it costs (quite a bit!)Will delete.

    By Pjt3
    Will delete.