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: 7.0.0
  • Adult Rating: 4+
  • File Size: 24.40 MB
  • Developer: SkyPaw Co. Ltd
  • Compatibility: Requires iOS 9.0 or later.
Score: 4.5
From 50,235 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:



  • Keeps crashing

    By Paid subscriber, irate
    I used the new version and liked it so much I bought the premium version.. However it's very unstable. Crashes all the time. I've uninstalled and reinstalled twice. Still does it. Finally deleted it and bought another one.
  • Poor customer service... no way to stop membership

    By Jakes4
    I want to delete this app and stop the required membership but support won’t answer my emails and there is no way to delete membership from the app. Bunch of hucksters out to take money with no way to cancel!!!
  • Horrible

    By upset 100
    I tried the trial period and then removed it. They have now charged me twice, after contacting them to take it off. I will keep writing these reviews until they refund me and make it write.
  • App is probably good, but depends on phone

    By popgoesthewheasel
    Works differently based on factors at the time. For example, if you hold the phone wrong, or what kind of cover is on your phone.
  • Awesome user interface

    By Stuey da Man
    The user interface has very cleverly designed graphic that vividly represent the auditory environment.
  • Not free

    By Schmuck321
    Annoying, tries to sell you shot everytime you turn it on. It is not free
  • Decent meter

    By CG the Mexican
    Checked against a lab calibrated meter, very close in readings. I tuned post production stages for almost 20 years and am a SBE certified audio engineer and broadcast engineer. Only thing I don’t care for is a monthly charge for a and c weightings. I’d rather just buy the app outright.
  • Very useful

    By Dublinbiker
    Works great! My audiologist said it’s as accurate as anything out there. Easy and convenient to use.
  • $3 / Month is Not Free

    By Mikey1960
    Might be free to download but then charging $3 / month hardly is “free”.
  • Not accurate

    By JDizzle320
    Sitting in my completely silent living room and it reads 55 decibels. Put near a white noise machine that was loud and it read 47 decibels. Not accurate.