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 60,063 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:




  • Requiring purchase the second the app starts is underhanded

    By iamhootis
    In-app purchase means the second you are in the app, you must purchase! I despise developers that won’t just sell the app in the first place. There is no world where this app is worth a subscription plan!
  • Scotty

    By Scotty's Ears
    Change my life
  • Yay!!! Works great!!!

    By dlandb
    Kicks out numbers but I have no idea if it is reasonably accurate!! But anyway....want to go get some chicken wings??
  • Great!

    By Bar1char
    This was referred to me by a voice therapist who uses it with his patients. I’m in a rock band, and I use it to protect my ears, gauge a room, check out relative volumes, etc. Works perfectly.
  • App tries to trick you into a subscription.

    By Noah42
    Really? Who would pay a monthly subscription for a trivial app like this?
  • Beware. 3-day trial then a monthly subscription

    By Paul Noce
    Crooks. This is not a free app. It should not be listed as free. What a sleazy thing to do to lure people in and then hit them with a monthly subscription free.
  • Just a 3 day trial

    By jeehe
    No mention that it’s just a three day trial until you’ve already downloaded it. It’s actually 3.99 a month. Be up front about charging for your products.
  • Awesome

    By dghjkgfk
    East to use and does exactly what i needed it to do
  • Aggressive ads and purchases

    By MountainCat23
    So aggressive with ads, links, and attempts to make you buy a trial that I can’t even figure out if the app is good enough to buy the upgrade. Why not just follow normal and ethical freemium approach which respects the end user. This is not a smart way for the developer to make money. I would have been happy to pay if it was useful, but the approach turned me off.
  • Not Actually Free

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