What's New

Thanks for using Decibel X! Here's what's new for the version 9.7.0:
∿ Data management now supports multiple editing
∿ Data management now supports batch exporting
∿ Fix a critical bug that prevents the app from running on Apple Watch
∿ Adds settings option for showing Live Activities widget
∿ Supports interactive Live Activity widgets
∿ Adds more UI types for Live Activity and Dynamic Island widgets
∿ Upgrade library components
∿ Several other minor improvements & fixes

What to expect in upcoming versions:
∿ Set notification alarm when exceeded a preset threshold
∿ Support external or bluetooth mics
∿ Hearing test

App Description

"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
- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile
- 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.
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).
- Support Live Activity, Dynamic Island
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC

OTHER GREAT FEATURES:

- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)
- MIC Gain Offset from -50 dB to 50 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- SPECTROGRAPH
- 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

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.

* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html
* EULA: http://www.skypaw.com/decibelx/terms.html

iPhone Screenshots

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Decibel X:dB Sound Level Meter screenshot 1 Decibel X:dB Sound Level Meter screenshot 2 Decibel X:dB Sound Level Meter screenshot 3 Decibel X:dB Sound Level Meter screenshot 4 Decibel X:dB Sound Level Meter screenshot 5

iPad Screenshots

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Decibel X:dB Sound Level Meter screenshot 6 Decibel X:dB Sound Level Meter screenshot 7 Decibel X:dB Sound Level Meter screenshot 8 Decibel X:dB Sound Level Meter screenshot 9 Decibel X:dB Sound Level Meter screenshot 10

Apple Watch Screenshots

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Decibel X:dB Sound Level Meter screenshot 11

App Changes

  • November 16, 2011 New version 1.0.1
  • February 26, 2012 New version 1.1.0
  • September 07, 2012 New version 3.5.0
  • October 01, 2012 New version 3.6.0
  • October 13, 2012 New version 3.6.1
  • April 15, 2013 New version 3.6.2
  • August 01, 2013 New version 3.7.0
  • October 07, 2013 New version 3.8.1
  • February 21, 2014 New version 3.8.2
  • July 15, 2014 New version 3.8.4
  • July 18, 2014 New version 3.8.5
  • November 15, 2014 New version 4.0.0
  • November 22, 2014 New version 4.0.1
  • December 29, 2014 New version 4.1.0
  • February 16, 2015 New version 4.1.1
  • May 27, 2015 New version 4.1.2
  • September 23, 2015 New version 4.2.0
  • September 24, 2015 New version 4.2.2
  • October 07, 2015 New version 4.2.3
  • February 04, 2016 New version 4.3.0
  • February 19, 2016 New version 4.3.1
  • February 19, 2016 New version 4.3.1
  • July 05, 2016 New version 4.3.5
  • November 07, 2016 New version 4.3.6
  • December 04, 2016 New version 5.0.0
  • December 14, 2016 New version 5.1.0
  • December 17, 2016 New version 5.1.1
  • December 20, 2016 New version 5.1.2
  • June 13, 2019 New version 7.0.0
  • August 28, 2019 New version 8.0.0
  • September 04, 2019 New version 8.0.1
  • September 11, 2019 New version 8.0.2
  • September 24, 2019 New version 8.0.3
  • September 30, 2019 New version 8.0.4
  • December 03, 2019 New version 8.1.1
  • December 17, 2019 New version 8.1.3
  • July 15, 2020 New version 8.2.4
  • October 27, 2020 New version 9.0.0
  • November 12, 2020 New version 9.1.0
  • December 09, 2020 New version 9.2.0
  • August 06, 2021 New version 9.3.3
  • September 16, 2023 New version 9.6.2
  • November 15, 2023 New version 9.7.0