This app transforms your device into a professional sound level meter, precisely measuring ambient noise pressure. It offers advanced features like frequency analysis, historical data management, and dosimeter functions, making it useful for various applications and entertainment.
Summarized from real user reviews of Decibel X. Based on 161K reviews and a 4.6/5 average, it highlights the 5 positives and 5 negatives reviewers mention most about this Utilities app.
9.9.5
April 4, 2026
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
MoreGet everything Decibel X has to offer
$2.99
Data Export
No limits when saving data
3 issues
App crashes when deleting recordings
Microphone issues on certain devices
5 requests
Add GPS coordinates to recordings
Improve reporting and data export
Decibel X turns your iOS device into a professional sound level meter. It precisely measures the sound pressure level (SPL) around you and offers advanced features like frequency spectrum analysis and historical data management.
Key features include trusted accuracy with pre-calibrated measurements, Apple Watch support, Health App integration, various frequency weighting filters (A, C, Z, ITU-R 468), powerful history data management with export options, dosimeter functions, and real-time FFT and BAR graphs for frequency analysis.
The app is free to download and use, but it offers in-app purchases for additional features and functionalities. This allows users to access core features for free while enabling advanced options for those who need them.
Decibel X is designed for iOS devices and is tested and pre-calibrated for all Apple devices. It also supports Apple Watch for convenient on-wrist monitoring and can integrate with the Health App.
Common use cases include measuring the noise level in your room, assessing the loudness of concerts or sporting events, conducting acoustic analysis, monitoring noise exposure for health and safety compliance (using dosimeter features), and for musical tests and frequency analysis.
