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 61,122 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:



  • Church Sound

    By TY489
    Great app worth 6 stars. I've been using this app for several years in the sound ministry to help with mixing and sound levels. I've not found anything better.
  • ???

    By FraggleRaggle
  • Deleted immediately

    By Fenriq
    This app is “free” for 3 whole days and then they charge you $3/month. For a phone based sound meter app. This kind of bait and switch fraud app should not be allowed in the App Store.
  • Warning!! Subscription App

    By Franklucas808
    $3 a month u gotta be stupid
  • Great application

    By bosunman
    Enjoy using this app especially when she says My program is louder than hers. I am then able to prove my point
  • Fail

    By Jonnyb0503
    Doesn’t work correctly
  • dB Meter

    By Rooster#1
    This app found its way on my phone 4 years ago and although it wasn’t the best performing app at the time, I didn’t replace it. It worked adequately for my needs. Today November 2019, the dB Meter is quite improved and I can recommend it to all who have a need for such a device. Basically, a dB phone meter is at the mercy of it’s ability to interact with the mic on the phone. IMO, the makers of this app have sorted this issue. I’m on an iPhone 8 currently.
  • Not for me

    By dave3984456
    Download for free and must purchase 3 day trial up front. Should ask me AFTER trial is up, not now immediately after I download it. Deceptive at best.
  • Review

    By hdjfirjbshrjtjkskvehjfj
    Simple and easy to use
  • Worked only once

    By da812373
    And then never saw fft work again regardless of run/pause button state.