# Decibel X PRO: dBA Noise Meter — Frequency Spectrum Analyzer

> Professional sound level meter with frequency analysis and data logging. (iPhone/iPad app by SkyPaw Co., Limited.)

- Source: https://appshunter.io/ios/app/decibel-x-pro-dba-noise-meter/id1257651611 (this page in markdown: same URL + `.md`)
- Developer: [SkyPaw Co., Limited](https://appshunter.io/developer/1842040687)
- Category: Utilities, Education
- Price: $69.99
- Rating: 4.70/5 from 6,888 App Store ratings · 255 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 25 MB
- Languages: Vietnamese, American English, Dutch, European Spanish, Italian, Korean, German (Germany), European Portuguese, Chinese (Traditional, Taiwan), Chinese (Simplified, China) and 2 more
- Released: 2017-07-10
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/decibel-x-pro-dba-noise-meter/id1257651611/reviews.md

## What is Decibel X PRO?

"Decibel X" is the leading noise meter app on the market, which has highly reliable, pre-calibrated measurements and supports dBA, dBC. Our success lies at the intersection of expertise in sound communication, listening to our dear users, and our vision to build a great product. Our app turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. While this pro tool mainly aids audio experts or workers prone to noise pollution, it can also add more fun and protect your hearing. Have you ever wondered how quiet your surroundings are or how loud is a rock concert or football match? "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
- 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.

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

## Key features

- Professional sound level meter
- dBA and dBC measurements
- Frequency spectrum analysis (FFT, BAR graphs)
- Data logging and export (PNG, CSV)
- Apple Watch support
- Health App integration
- Dosimeter with NIOSH, OSHA standards

## What do users think of Decibel X PRO?

Overall sentiment: positive

**Pros**

- 👍 Works well
- 🚀 Keeps getting better with updates
- 💡 Useful for monitoring noise levels
- 💡 Helps protect hearing
- 👍 Accurate measurements
- 👍 Intuitive and easy to use
- 👍 Solid sound meter app
- 👍 Meets expectations

**Cons**

- 🐛 Data transfer issues between devices
- 🐛 Crashes and stability issues
- 🐛 Camera crashes
- 🐛 Bugs with dark mode and language settings
- 🐛 Inconsistent readings compared to other apps
- 🐛 Inability to rotate screen
- 🐛 Ads and frequent rating prompts in paid version

**Commonly reported bugs**

- Crashes on launch after recent update
- Inability to open app on iPhone 6S and newer devices
- Incorrect or unreadable data display on iPad

**Most requested features**

- Add video recording with live dB overlay
- Improve readability of frequency scale
- Include dBC measurements
- Add alarm for exceeding noise thresholds
- Provide more detailed documentation and support
- Improve cloud/iCloud sync and data management

## Recent user reviews (10 of 255)

All indexed reviews: https://appshunter.io/ios/app/decibel-x-pro-dba-noise-meter/id1257651611/reviews.md

### 5/5 — G

*2026-07-06*

Excellent

**Developer response:** Thank you for sharing your reviews with us. Your reviews are our motivation to further improve Decibel X.

### 5/5 — Cool

*2026-05-22, version 9.9.5*

It’s helpful for analyzing a stereo setup until the microphone limitations kick in. You’d make make ton$ with a good microphone.

### 5/5 — It works well

*2026-03-08, version 9.9.4*

I use this for both professional and personal projects. It’s fairly accurate as far as I can tell.

### 5/5 — This is the app!

*2026-03-01, version 9.9.4*

Don’t bother with anything else. I can’t think of anything else you would want in a decibel meter.

### 4/5 — 横画面

*2025-12-18*

iPadで使用時、横画面での表示がおかしくなる場合がある。iPad OS 26以降。

**Developer response:** Hi, sarryyyyyyy! Thank you for your feedback. Have you tried the latest update? If it still doesn't work, could you contact us at contact@skypaw.com so we can work together to figure it out? With our user-obsessed mentality, we shall continue to leverage and level up our standard features and advance ones based on users' needs.

### 5/5 — www.ZERUBARIEL.com

*2025-12-08, version 9.9.4*

www.ZERUBARIEL.com

### 5/5 — Best

*2025-10-27, version 9.9.4*

Handy tool for seeing where sound is.

### 5/5 — Great app!

*2025-06-29, version 9.9.1*

Thank you for fixing the landscape mode!!  Great app!

### 1/5 — What happened?

*2025-06-29, version 9.9.1*

I purchased the pro version some time ago and everything was good. Now after this update some important features have been made part of a subscription such as FFT size 8192 and weighting C. Without those this app is useless! You should not move features I already paid for into a subscription. Add something new but don’t steal features I already paid for. I want them back otherwise refund my money.

### 1/5 — Stop asking for a rating

*2025-06-19, version 9.9.0*

Stop asking for a rating

## Frequently asked questions about Decibel X PRO

### What does Decibel X PRO do?

Decibel X PRO turns your iOS device into a professional sound level meter. It precisely measures the sound pressure level (SPL) around you, supporting dBA and dBC measurements. The app also offers advanced features like frequency spectrum analysis and data logging.

### What are the key features of Decibel X PRO?

Key features include trusted accuracy with pre-calibrated measurements, Apple Watch support, Health App integration, frequency weighting filters (ITU-R 468, A, B, C, Z), powerful history data management with export options, dosimeter functionality, and real-time FFT and BAR graphs for frequency analysis.

### How much does Decibel X PRO cost?

Decibel X PRO is a paid application. The provided data indicates it does not have in-app purchases or ads, suggesting a one-time purchase for the full functionality.

### Is Decibel X PRO compatible with my device?

The application is optimized for iOS 11 and is designed for iOS devices. It also offers Apple Watch support for convenient on-wrist monitoring of noise levels.

### Who would benefit from using Decibel X PRO?

This app is primarily beneficial for audio experts and workers who are prone to noise pollution, as it provides professional-grade measurements. It can also be used by anyone curious about their surroundings' noise levels, for entertainment, or for hearing protection purposes.

## Version history (last 5 releases)

### 9.9.5 — 2026-03-17

Thanks for using Decibel X! Here's what's new for the version 9.9.5:
∿ [Fixes] - Fix an issue with restoring purchases in paywall screen
∿ [Fixes] - Fix an UI issue for the bottom tab bar
∿ [Improvements] - Support for new devices
∿ [Improvements] - Upgrade library components
∿ [Improvements] - Several other minor tweaks & bug fixes

What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test

### 9.9.4 — 2025-09-30

Thanks for using Decibel X! Here's what's new for the version 9.9.4:
∿ [Fixes] - Fix a UI issue for the bottom tab bar
∿ [Improvements] - Upgrade library components
∿ [Improvements] - Several other minor tweaks & bug fixes

What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test

### 9.9.3 — 2025-09-17

Thanks for using Decibel X! Here's what's new for the version 9.9.3:
∿ [New Feature] - Support latest iOS 26 and new released devices
∿ [Fixes] - Fix a crashing issue when tapping on Settings twice
∿ [Fixes] - Fix a crashing issue when checking subscription status at launching
∿ [Improvements] - Upgrade library components
∿ [Improvements] - Several other minor tweaks & bug fixes

What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test

### 9.9.2 — 2025-07-02

Thanks for using Decibel X! Here's what's new for the version 9.9.2:

∿ [Fixes] - Fix an issue where some functionalities are still locked
∿ [Fixes] - Fix an issue where fullscreen mode not working when rotated landscape
∿ [Fixes] - Fix an issue where spectrum graph showing incorrect scale in linear mode
∿ [Fixes] - Fix an issue where dragging instantaneous value label not movable in fullscreen mode
∿ [Fixes] - Fix an issue where wave graph occasionally not showing
∿ [Improvements] - Add support for newer devices
∿ [Improvements] - Upgrade library components
∿ [Improvements] - Several other minor tweaks & bug fixes

What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test

### 9.9.1 — 2025-06-25

Thanks for using Decibel X! Here's what's new for the version 9.9.1:

∿ [Fixes] - Fix an issue where fullscreen mode not working when rotated landscape
∿ [Fixes] - Fix an issue where spectrum graph showing incorrect scale in linear mode
∿ [Fixes] - Fix an issue where dragging instantaneous value label not movable in fullscreen mode
∿ [Fixes] - Fix an issue where wave graph occasionally not showing
∿ [Improvements] - Add support for newer devices
∿ [Improvements] - Upgrade library components
∿ [Improvements] - Several other minor tweaks & bug fixes

What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test

## Apps similar to Decibel X PRO

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Decibel X:dB Sound Level Meter](https://appshunter.io/ios/app/decibel-xdb-sound-level-meter/id448155923) | 4.6 (160,618) | Free | Utilities |
| [Decibel : dB sound level meter](https://appshunter.io/ios/app/decibel-db-sound-level-meter/id1227650795) | 4.6 (36,118) | Free | Utilities |
| [Noise Guru: Decibel Meter](https://appshunter.io/ios/app/noise-guru-decibel-meter/id6444836813) | 4.6 (299) | Free | Utilities |
| [dB Meter & Spectrum Analyzer](https://appshunter.io/ios/app/db-meter-and-spectrum-analyzer/id733773616) | 4.7 (865) | $29.99 | Utilities |
| [Decibel Meter Sound Level pro](https://appshunter.io/ios/app/decibel-meter-sound-level-pro/id6737704013) | 4.5 (28) | Free | Utilities |
| [Decibel Meter - Sound Analyzer](https://appshunter.io/ios/app/decibel-meter-sound-analyzer/id1579747105) | 3.5 (54) | Free | Utilities |

## More apps by SkyPaw Co., Limited

- [Toolbox PRO: Smart Meter Tools](https://appshunter.io/ios/app/toolbox-pro-smart-meter-tools/id354112909)
- [Decibel X:dB Sound Level Meter](https://appshunter.io/ios/app/decibel-xdb-sound-level-meter/id448155923)
- [Toolbox - Smart Meter Tools](https://appshunter.io/ios/app/toolbox-smart-meter-tools/id933528345)
- [Translator X: Text Voice Photo](https://appshunter.io/ios/app/translator-x-text-voice-photo/id1276098141)
- [Translator X PRO](https://appshunter.io/ios/app/translator-x-pro/id1276098150)

All apps by SkyPaw Co., Limited: https://appshunter.io/developer/1842040687

## Related topics

[signalscope x](https://appshunter.io/ios/topics/signalscope-x) · [noise level manager](https://appshunter.io/ios/topics/noise-level-manager) · [decibel x pro sound meter](https://appshunter.io/ios/topics/decibel-x-pro-sound-meter) · [decibel x pro](https://appshunter.io/ios/topics/decibel-x-pro) · [spectralscan audio analyzer](https://appshunter.io/ios/topics/spectralscan-audio-analyzer) · [ugly meter pro](https://appshunter.io/ios/topics/ugly-meter-pro) · [checking noise](https://appshunter.io/ios/topics/checking-noise) · [db meter wifi](https://appshunter.io/ios/topics/db-meter-wifi) · [frequency meter audio](https://appshunter.io/ios/topics/frequency-meter-audio) · [motor noise analyzer](https://appshunter.io/ios/topics/motor-noise-analyzer) · [dark sky meter pro](https://appshunter.io/ios/topics/dark-sky-meter-pro) · [sound gauge pro](https://appshunter.io/ios/topics/sound-gauge-pro) · [nosh sound level meter](https://appshunter.io/ios/topics/nosh-sound-level-meter) · [air density & rad meter pro](https://appshunter.io/ios/topics/air-density-rad-meter-pro) · [iauditoria](https://appshunter.io/ios/topics/iauditoria) · [splnfft noise meter](https://appshunter.io/ios/topics/splnfft-noise-meter) · [traffic lights noise detector](https://appshunter.io/ios/topics/traffic-lights-noise-detector) · [sound noise decibel meter](https://appshunter.io/ios/topics/sound-noise-decibel-meter) · [niosh sound level meter free](https://appshunter.io/ios/topics/niosh-sound-level-meter-free) · [decibel meter master](https://appshunter.io/ios/topics/decibel-meter-master)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*