Decibel : dB sound level meter

Decibel : dB sound level meter

Audio noise Spectrum Analyzer

36K ratings
512 reviews
Free
In-App Purchases

Details

Released
May 4, 2017
Updated
February 12, 2026

Features

Decibel : dB sound level meter screenshot #1 for iPhone
Decibel : dB sound level meter screenshot #2 for iPhone
Decibel : dB sound level meter screenshot #3 for iPhone
Decibel : dB sound level meter screenshot #4 for iPhone
Decibel : dB sound level meter screenshot #5 for iPhone
Decibel : dB sound level meter screenshot #6 for iPhone
Decibel : dB sound level meter screenshot #7 for iPhone
Decibel : dB sound level meter screenshot #8 for iPhone
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About

Transform your device into a professional sound level meter and audio analyzer. Measure ambient noise, monitor decibel levels, and visualize sound frequencies in real time. It also offers advanced sleep tracking with sound recognition to identify disruptions.

✓Real-time decibel (dB) sound level monitoring
✓Integrated Spectrum Analyzer (FFT, spectrogram)
✓Sleep tracking with sound recognition
✓Noise exposure data export to Health app
✓Add sound level overlays to photos/videos
✓Save, export, and playback sound measurements
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What users say about Decibel

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What's New in Decibel

9.5.3

February 12, 2026

• UI optimizations for iPhone Air • In some rare cases, audio processing caused the app to crash on iOS versions prior to 26. This update may fix this issue. Do you like the new version of the app? Share your review on the App Store. Do you dislike anything about it? All the more reason to say something! Your comments help make the app better and I'm value them greatly so don't hesitate to share them.

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Subscriptions & In-App Purchases

Premium Mode Subscription

Access to all available Pro features

$9.991 Month
How to cancel Decibel subscription ⁉️

User reviews

Looks good, but…

Looks good and has lots of options. But I do not like the way it try’s to get you to sub, looking like there is no option to take a free trail before the auto sub afterwards, and just about made out the ‘cross on the top left of page, almost grayed out, very difficult to see, and that was on my iPad, was almost about to delete at that point. Got into the free version but pretty much any setting you want to change, no matter how small, it will only work with paid version. So thought I would leave this to warn others. I’m sure it is a good app as had lots of options for subscription but the predatory tactics ruined it for me sadly. Review - Delete - Move on to the other ones that are either free or paid versions that don’t try and fool you into making a decision.
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Cunning survice

I wanted it only for one week to try out/test and they have somehow misguided me to pay for the whole year!

Be careful if you get the app and get the free trail version. After trial it auto renews to the whole year, not even for just one month. They have done this internationally!

Support bouncebacks

On a week’s trial, have a question about timestamps on saved files.
“Button at the bottom” on Help section of the app isn’t there and emails to support bounced back “Unable to deliver message after multiple retries, giving up.”

Good app

Useful without a subscription Five stars for you guys

Excellent

Great app to learn about sound and sound level effects

Developer apps

User experience

🐞

Reported Bugs

3 issues

App crashes or freezes during use

Bug

Subscription issues and unwanted charges

Bug

Microphone compatibility problems

Bug
✨

Requested Features

4 requests

Add option to set noise level alerts

Feature

Improve geolocation and recording features

Feature

Allow audio playback while using the app

Feature

Provide more calibration options

Feature

FAQ

What does the Decibel app do?

Decibel transforms your device into a powerful sound level meter and audio analyzer. It allows you to measure ambient noise in real time, monitor decibel levels, and explore sound frequencies using its integrated Spectrum Analyzer. The app also features sleep tracking with smart sound recognition to identify nighttime disruptions.

What are the key features of Decibel?

Key features include real-time visualization of ambient sound levels and decibel readings, integration with the Health app for noise exposure tracking, the ability to add live sound level overlays to photos and videos, saving sound measurements with location data, and recording, storing, exporting, and playing back sound measurements. It also offers an advanced Spectrum Analyzer with FFT and spectrogram modes.

How does the sleep tracking feature work?

The sleep tracking feature uses smart sound recognition to detect common sleep sounds like snoring, coughing, or talking, as well as other household or environmental noises that might affect sleep quality. Detected sounds are displayed on a detailed sleep timeline, allowing you to see when disruptions occurred and play back the related audio for analysis. All processing is done on-device for privacy.

Is Decibel free to use?

Decibel offers optional subscriptions that unlock advanced tools and ongoing feature enhancements. While the app provides core sound measurement functionalities, certain advanced features and continuous updates are available through these subscriptions. The app also has in-app purchases and may display ads.

Can I use external microphones with Decibel?

Yes, the app supports external microphones. You can calibrate connected microphones directly within the app and create custom profiles for different microphones. This allows for more precise and tailored audio measurements.