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: 9.3.3
  • Adult Rating: 4+
  • File Size: 32.15 MB
  • Developer: SkyPaw Co. Ltd
  • Compatibility: Requires iOS 10.0 or later.
Score: 4.47931
From 12,107 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:



  • Subscription

    By hguoy
    Monthly subscription
  • Works Great!!

    By I tap for tips
    Easy to use..
  • Im a sound person now

    By Poolboywritesteviews
    I meter acoustic pressure everywhere. Car, bedroom, studio, office, show, restaurant. Fascinating stuff and it’s free !
  • Fraud - suspect cyber criminal

    By Rick Rowe
    It says free. It’s free to fill out the page but that’s where it ends. You can’t log out of the app. Even when you disengage your camera and microphone it still reads sound. You can turn off your microphone so how does it read sound? Delete the app. Buy a new phone, change my Apple ID. Start again. Total cost $1395. You’ll be getting a letter from a lawyer.
  • Garbage

    By oliuljasan
  • Actually pretty impressed

    By Lia Corbett
    Got this due to a out of control landlord blasting country music at all hours loudly. Thanks to this great little app I was able to prove to the cops that it’s at a harmful and illegal level. I owe you devs a beer. Thanks!
  • why is would anyone pay for this

    By itunesdumbass
    downloaded because it was the top app when i searched for a decibel meter but lol if you think anyone is paying a subscription fee for this.
  • Paid app

    By Nicoco 12312
    This is a fake free app. Just download something else than this.
  • Scam of an app

    By zaczim333335
    They trick you into a monthly subscription of over $7 a month. Super scummy and shady app. This should be removed from the app store do not fall for this crap!
  • Paid app

    By Losuol
    Doesn’t disclose