Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

Decibel X:dB Sound Level Meter Screenshots

iPad

iPhone

About Decibel X:dB Sound Level Meter

"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

What's New in the Latest Version 9.7.0

Last updated on Sep 21, 2023

Old Versions

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

Version History

9.7.0

Sep 21, 2023

9.6.2

May 10, 2023

Thanks for using Decibel X! Here's what's new for the version 9.6.2:
∿ Fix an issue where saved logs synced from iCloud might not show histograph
∿ Change edit mode of saved data for better manipulation
∿ Vastly improve many UI elements
∿ 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

9.6.1

Feb 11, 2023

Thanks for using Decibel X! Here's what's new for the version 9.6.1:
∿ Fix an issue where legacy users cannot restore their purchases to access locked features (i.e ad removal, frequency weightings, data export)
∿ Fix an issue where crash may happen when calibrating
∿ Fix an issue where crash may happen when access to spectrogram
∿ 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

9.6.0

Jan 16, 2023

Thanks for using Decibel X! Here's what's new for the version 9.6.0:
∿ Add a whole new powerful calibration screen which supports: Linear, per Octave calibrating and load/save profile.
∿ Support Live Activity
∿ Support Dynamic Island
∿ Support Lock Screen widget
∿ Fix a camera issue that limits recording duration for subscribers
∿ Fix an issue where need to double swipe to exit the app
∿ Vastly improve UI and performance
∿ Upgrade library components
∿ Various 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

9.5.0

Jun 3, 2022

Thanks for using Decibel X! Here's what's new for the version 9.5.0:
∿ Tap on labels to change between AVG - MIN, PEAK - MAX
∿ Spectrum graph now shows peak value
∿ Tap on Instantaneous label to show its fullsreen mode
∿ Upgrade components
∿ Various improvements & fixes

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

9.4.0

Nov 15, 2021

Thanks for using Decibel X! Here's what's new for the version 9.4.0:
∿ Now support recording in background
∿ Histograph supports Line and Dot drawing modes
∿ Improve Spectrogram rendering
∿ Fix an issue where audio file might not be saved when auto saving is ON
∿ Upgrade components
∿ Various improvements & fixes

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

9.3.3

Jun 29, 2021

Thanks for using Decibel X! Here's what's new for the version 9.3.3:
∿ Fix an issue where summary report is not displayed
∿ Upgrade components
∿ Several improvements & fixes

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

9.3.2

Jun 16, 2021

Thanks for using Decibel X! Here's what's new for the version 9.3.2:
∿ Fix an issue where app may crash when access calibration screen
∿ Upgrade components
∿ Several improvements & fixes

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

9.3.0

May 13, 2021

Thanks for using Decibel X! Here's what's new for the version 9.3.0:
∿ We listen to your feedback and completely remove all ads without premium upgrade
∿ Support logarithm scale for spectrogram
∿ Add "Impulse (50ms)" response time
∿ Improve Calibration UI for better fine tunes flow
∿ Enable iCloud Sync will now include audio data by default
∿ Drastically reduce app size
∿ Improve histo graph UI for better visualization
∿ Upgrade components
∿ Various improvements & fixes

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

9.2.1

Dec 17, 2020

Thanks for using Decibel X! Here's what's new for the version 9.2.1:
∿ Upgrade components
∿ Various minor improvements & fixes

What to expect in upcoming versions:
∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics
∿ Support exponential scale for spectrograph

9.2.0

Dec 7, 2020

Thanks for using Decibel X! Here's what's new for the version 9.2.0:
∿ Add 'Data Logs' widget
∿ Fix widget display issue
∿ Components upgrade
∿ Various minor improvements & fixes

What to expect in upcoming versions:
∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics
∿ Support exponential scale for spectrograph

9.1.0

Nov 3, 2020

Thanks for using Decibel X! Here's what's new for the version 9.1.0:
∿ Now support Home Widget on iOS 14. More widgets are coming in next updates
∿ Add 'Peak Hold' option
∿ Tap on spectrum graph for corresponding frequency, current and peak values
∿ Components upgrade
∿ Various minor improvements & fixes

What to expect in upcoming versions:
∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics
∿ Support exponential scale for spectrograph

9.0.0

Sep 18, 2020

Thanks for using Decibel X! Here's what's new for the version 9.0.0:
∿ Support iOS 14
∿ App Clip: instantly try the app without downloading. Just go into our website or scan our QR code with your iPhone's camera
∿ Components upgrade
∿ Various minor improvements & fixes

What to expect in upcoming versions:
∿ Home Widget
∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics
∿ Support exponential scale for spectrograph

8.2.8

Sep 12, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.8:
∿ Make subscription screen more intuitive to users
∿ Make buttons of navigating graphs clearer
∿ Components upgrade
∿ Various minor improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics
∿ Support exponential scale for spectrograph

8.2.7

Aug 20, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.7:
∿ Fix HISTO graph not displaying issue
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.6

Aug 18, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.6:
∿ Support upside down rotation for notched devices
∿ Fix ad display issue
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.5

Aug 15, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.5:
∿ Improve HISTO graph for better visualization & performance
∿ Fix an UI issue when subscription period is ended
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.4

Jul 6, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.4:
∿ Improve UI with round corners
∿ Add localizations for some texts
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.3

Jul 1, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.3:
∿ Fix spectrum and bar graphs issue where axis labels are overlapped
∿ Fix summary report issue where frequency weighting is incorrect
∿ Fix ad display issue
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.2

Jun 27, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.2:
∿ Fix an issue where fullscreen layout is incorrectly offset
∿ Introduce discount price for re-subscribers
∿ Prevent accidently quitting the app when swiping up at the bottom
∿ Change frequency weighting slider into button style for better UX
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.1

May 21, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.1:
∿ Fix a critical issue where some saved data cannot playback
∿ Fix an issue where some upload data onto iCloud might have 0 bytes
∿ Fix an issue where a data item being deleted will now stop if playing back audio
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.2.0

Apr 24, 2020

Thanks for using Decibel X! Here's what's new for the version 8.2.0:
∿ Add fullscreen spectrum analysis, by just rotating your device into landscape.
∿ Powerful spectrum analyzer with support to customize: FFT size, windowing, octave.
∿ Support better flow for saving and exporting recorded video
∿ App name is localized on home screen
∿ Fix an issue where video recording is not reset
∿ Fix a random crash when showing peaks
∿ Fix an issue where premium users still seeing watermark when recording videos
∿ Components upgrade
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ Support external mics

8.1.3

Dec 13, 2019

Thanks for using Decibel X! Here's what's new for the version 8.1.3:
∿ Add home screen quick actions menu, including: Camera, Dosimeter, Sound Meter and Data Management
∿ Fix status bar display issue on iOS 13
∿ Fix an issue where after displaying an ad, the meter is paused
∿ Several improvements & fixes

What to expect in upcoming versions:

∿ Set notification alarm when exceeded a preset threshold
∿ More powerful spectrum analyzer with support to customize: FFT size, windowing, octave.
∿ Background recording
∿ Support external mics

8.1.2

Dec 11, 2019

Thanks for using Decibel X! Here's what's new for the version 8.1.2:
∿ Integrate with Apple Health (require iOS 13 and above). Now when enabled, the app will automatically send measurement data into Health app to help you keep you in sync with Apple Health
∿ Fix random crashes when exporting PDF data
∿ Fix an issue which sometimes not cannot save WAVE data
∿ Fix an issue which stop updating values when opening reference table
∿ Several improvements & fixes

What to expect in the next version:

∿ Set notification alarm when exceeded a preset threshold
∿ More powerful spectrum analyzer with support to customize: FFT size, windowing, octave.
∿ Background recording
∿ Support external mics

8.1.1

Dec 1, 2019

Thanks for using Decibel X! Here's what's new for the version 8.1.1:
∿ Add WAVE recording and playback along with saved data
∿ Vastly improve data management and add new data exports: CSV, HTML, PDF and WAVE
∿ Add Map view to visually locate saved data
∿ Vastly improve Dosimeter interface
∿ Metadata changes
∿ Various other improvements & fixes

What to expect in the next version:
∿ Integrate with Health app
∿ Set notification and alarm when exceeded a preset threshold
∿ More powerful spectrum analyzer with support to customize: FFT size, windowing, octave

Feedback Report

Decibel X:dB Sound Level Meter FAQ

How to download Decibel X:dB Sound Level Meter if it’s not available in your country?

Click here to learn how to download Decibel X:dB Sound Level Meter in restricted country or region.

What's the minimum requirements to run Decibel X:dB Sound Level Meter?

Check the following list to see the minimum requirements of Decibel X:dB Sound Level Meter.

iPhone

Requires iOS 11.0 or later.

iPad

Requires iPadOS 11.0 or later.

Apple Watch

Requires watchOS 4.0 or later.

iPod touch

Requires iOS 11.0 or later.

What language does Decibel X:dB Sound Level Meter support?

Decibel X:dB Sound Level Meter supports English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese