Decibel X: Your Professional-Grade Sound Level Meter

Transform your iPhone into a highly accurate, pre-calibrated noise meter. Monitor environmental sound levels, track hearing health, and analyze real-time data with trusted precision.

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Publisher

SkyPaw Co., Limited

Precision at a Glance

Discover the interface used by 13M+ users.

A professional decibel meter app interface on an iPhone displaying frequency analysis and sound level measurements

Decibel X app interface showing a spectrum analyzer and sound level meter

Decibel X app interface showing the Dosimeter screen for monitoring noise exposure levels and hearing protection

Decibel X app showing sound level history records and data export options for WAV CSV PDF and HTML

Screenshot of Decibel X app showing the integration with Apple Health app to sync environmental sound levels.

Calibration screen of Decibel X app showing frequency graph and sound level adjustment tools

Smartphone screen displaying the Decibel X app camera mode with decibel readings and a frequency graph overlaid on a photo.

Screenshots of the Decibel X app interface showing dark light and classic themes with sound level meters and graphs

Professional Precision in Your Pocket

The tools that make this app stand out, trusted by 13M+ users.

🎯

Certified Accuracy

Skip the expensive hardware. Get pre-calibrated, professional-grade measurements with support for dBA, dBC, and real-time FFT frequency analysis.

🛡️

Health & Safety Compliance

Stay protected with a built-in dosimeter meeting NIOSH and OSHA standards. Sync your noise exposure directly with the Apple Health app.

📊

Data That Works for You

Record, analyze, and export. Save detailed history logs and export data as CSV or hi-res PNG graphs for noise disputes or professional reports.

Loved by users worldwide

Trusted by 13M+ people who love this app.

"As someone who attends a lot of concerts and live sports, Decibel X is a lifesaver. I love how it integrates with my Apple Health app to track my noise exposure. Checking the levels on my Apple Watch is so discreet and helps me know exactly when to put in my earplugs. It’s an essential tool for protecting my hearing!"

Sarah Jenkins

"I use Decibel X for monitoring noise levels at our construction sites to stay OSHA compliant. The accuracy is impressive compared to my standalone meter, and the ability to export data as a CSV for my reports is a massive time-saver. The FFT graphs are also incredibly useful for frequency analysis on the job."

Marcus Thorne

About the app

Everything you need to know about Decibel X:dB Sound Level Meter.

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

Latest Version

9.9.4

Size

81.3 MB

First Released

Nov 5, 2011

Turn Your Phone into a Professional-Grade Sound Meter

Join 13 million users who trust Decibel X for pre-calibrated accuracy, OSHA-standard safety reporting, and seamless Apple Health integration.

FAQ

Frequently Asked Questions

Everything you need to know about Decibel X:dB Sound Level Meter

How does Decibel X ensure accurate sound measurements?

Decibel X features pre-calibrated measurements for all Apple devices, ensuring trusted accuracy. Its precision matches that of real Sound Pressure Level (SPL) devices, making it a professional sound meter.

Can I track noise exposure over time with Decibel X?

Yes, Decibel X includes a dosimeter feature that complies with NIOSH and OSHA standards. It protects your ears by monitoring noise levels and can export data to the Health app for health insights.

What types of frequency weightings does Decibel X support?

Decibel X supports multiple frequency weighting filters including ITU-R 468, A, B, C, and Z. This allows for diverse frequency analysis and precise sound level measurements.

Does Decibel X integrate with Apple Health?

Yes, Decibel X integrates with the Apple Health app. It can automatically export noise levels directly into your Health app for comprehensive environmental sound data tracking and management.

Can Decibel X save and export measurement data?

Yes, Decibel X saves recording data automatically and syncs via iCloud. Users can export records in various formats, including WAV, PDF, CSV, and HTML, for future analysis and sharing.

What is the measurement range of the Decibel X app?

The Decibel X app provides a standard measurement range from 30 dBA up to 130 dBA. This range covers typical environmental and occupational sound levels for effective monitoring.

Can I customize the calibration of the Decibel X sound meter?

Yes, Decibel X supports powerful custom calibration, including Linear, Octave 1/1, and 1/3 options. Users can load and save calibration profiles for higher precision and accuracy.

Does Decibel X offer different visual themes for its interface?

Yes, Decibel X features a beautiful, intuitive UI design with three available themes. Users can choose between LIGHT, DARK, and CLASSIC themes for personalized visual experiences.

Can Decibel X display real-time frequency analysis?

Yes, Decibel X features FFT and BAR graphs for real-time frequency analysis. It also displays the predominant frequency, which is useful for musical tests and detailed sound examination.

Does Decibel X support Apple Watch?

Yes, Decibel X supports Apple Watch. Users can see noise levels directly from their wrist, providing convenient access to sound measurements without needing to access their phone.

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