Decibel : dB sound level meter

Name: Decibel : dB sound level meter
Rating: 4.6 (36020 reviews)
Author: Vlad Polyanskiy

Audio noise Spectrum Analyzer

Free · In‑App Purchases · Designed for iPad

36K Ratings
Ages

9+
Years
Category

Utilities
Developer

Vlad Polyanskiy
Language

EN
+ 13 More
Size

58.8
MB

Decibel is a feature-rich sound level meter with sleep tracking, a noise dosimeter, and an advanced Spectrum Analyzer with RTA, FFT, and spectrogram modes. Decibel turns your device into a powerful sound level meter without any extra hardware. Measure ambient noise in real time, monitor sound levels (dB), and explore frequencies with the built-in Spectrum Analyzer. Capture reliable sound and noise data wherever you are. Designed for casual users, audio enthusiasts, and sound engineers, Decibel works as a portable sound meter for quick sound checks or deeper audio analysis. Use it to easily check noise levels, test room acoustics, monitor workplace noise, or fine-tune audio equipment. Decibel has various advanced features, including saving and exporting noise measurement data, live sound level overlays for photos and videos, and exporting data to the Health app to track noise exposure over time. “The best way to meter sound levels” — AppAdvice SLEEP TRACKING AND SOUND RECOGNITION Decibel’s sleep tracking and smart sound recognition help you understand your sleep environment and nighttime noise. While sleep tracking is active, the app can detect common sleep sounds such as snoring, coughing, talking, and other household or environmental noise that may affect sleep quality. Each detected sound appears on a detailed sleep timeline, so you can see exactly when disruptions occurred and play back the related audio. This makes it easier to identify snoring patterns, sleep disturbances, and noise events that impact your rest. All sleep sound recognition and audio analysis are performed entirely on your device using advanced on-device machine learning. Recordings stay private, are processed locally, and never leave your device. KEY FEATURES - Visualize ambient sound levels and decibel (dB) readings in real time - Sync with the Health app to track and export noise exposure data - Add live sound level overlays to photos and videos - Save sound measurements with location data and custom labels - Record, store, export, and play back sound measurements - Export sound and noise data in CSV or audio formats SPECTRUM ANALYZER - Integrated Spectrum Analyzer with FFT and spectrogram modes - Multiple FFT sizes up to 16,384 points with selectable window functions - Flexible visualization modes and graph styles - Octave Band Real-Time Analyzer (RTA) for detailed frequency analysis EXTERNAL MICROPHONES AND CALIBRATION - Support for external microphones - Calibrate connected microphones directly in the app - Create and manage custom profiles for different microphones REPORTING AND EXPORT - Generate detailed noise measurement reports, including LAeq values - Batch export multiple measurements in supported formats Decibel app is not a replacement for professional devices and should be used for personal purposes only. By using this app, you acknowledge and agree that the developers and publishers are not liable for any decisions made based on the information provided by the app. SUBSCRIPTIONS Decibel offers optional subscriptions that unlock advanced tools and ongoing feature enhancements. With a subscription, you get access to an expanding set of professional Spectrum Analyzer features, advanced sound level weighting modes, and continued updates for compatibility with new devices and hardware. Subscriptions also include support for external microphones, unlimited saving and exporting of measurements, batch export tools, and audio and video exports with sound level overlays. Payment will be charged to your Apple account at confirmation of purchase. Subscriptions renew automatically unless auto-renewal is turned off at least 24 hours before the end of the current period. You can manage or disable auto-renewal at any time in your Apple ID account settings. By downloading and using the app, you agree to the following: Terms of Use: https://www.iubenda.com/terms-and-conditions/94359518 Privacy Policy: https://www.iubenda.com/privacy-policy/94359518 Disclaimer: http://dbmeterpro.com/disclaimer.html Questions or feedback? Contact us at support@decibelpro.app

Ratings & Reviews

4.6

out of 5

36K Ratings

A valuable, reliable and convenient sound meter
08/07/2020

hearbetter
For the past several years i have used this sound meter app to test each power tool in my woodshop and even my power sprayer. The meter shows the sound levels instantly in a very clear and easy to re-display. I then replaced some of my power tools like the small hand sanders with quieter units. For example I found that the Dewalt square sheet sander was much quieter than my previous small sander. I have 3M tech over the ear muffs in the shop but based on some of these readings I added foam earplugs as well. Also i simply use this phone app to test any new devices or equipment I’m interested in buying in stores as well. Keep in mind that the decibel level of a tool or concert depends on where you’re using it or standing. For example if you use a small high decibel device in the corner of a room it can be much much louder and more dangerous then if you use it in the center of a room!! I now, based on these meter readings, also bring earplugs to concerts and move further from the stage as needed to lower the decibels.

Developer Response
Hi there, thank you very much for your interesting and detailed feedback. Your support helps the developer to make the app better. Enjoy and stay safe
A valuable, reliable and convenient sound meter
08/07/2020

hearbetter

For the past several years i have used this sound meter app to test each power tool in my woodshop and even my power sprayer. The meter shows the sound levels instantly in a very clear and easy to re-display. I then replaced some of my power tools like the small hand sanders with quieter units. For example I found that the Dewalt square sheet sander was much quieter than my previous small sander. I have 3M tech over the ear muffs in the shop but based on some of these readings I added foam earplugs as well. Also i simply use this phone app to test any new devices or equipment I’m interested in buying in stores as well. Keep in mind that the decibel level of a tool or concert depends on where you’re using it or standing. For example if you use a small high decibel device in the corner of a room it can be much much louder and more dangerous then if you use it in the center of a room!! I now, based on these meter readings, also bring earplugs to concerts and move further from the stage as needed to lower the decibels.
Developer Response 08/08/2020
Hi there, thank you very much for your interesting and detailed feedback. Your support helps the developer to make the app better. Enjoy and stay safe
Great DB meter, decent hearing test
03/09/2025

jojosama_
Just wanted to leave a positive review. I’ve been using this app to test the sound levels of the various environments I’m in, and it works well enough for my purposes, I just want to know when to pop-in ear plugs and if I do, whether to use my 16 SNR or 31 SNR rated ones. I also use it to make sure in not playing music too loud in the car or the house (both recorded music and musical instruments). The hearing test was an added bonus. I’ve had increasing tinnitus ever since high school, I always assumed I had some hearing loss and that my right ear was worse. I was surprised to find out my hearing loss is only in the highest frequency band in the LEFT ear and only very minimal. It really put my mind at ease especially since my tinnitus recently got worse and I am still waiting for my Dr appointment to have it checked out. I’m more optimistic that treatments will help preserve my hearing and hopefully counter the tinnitus as I had falsely presumed before I most likely had irreversible noise induced hearing loss.

Developer Response
Thank you for your positive and detailed review. I really appreciate you taking the time to share your experience with the community and myself and I am very happy you found the Decibel app useful and convenient to use. I wish you all the best in your endeavors and in maintaining your hearing health. 🤗
Great DB meter, decent hearing test
03/09/2025

jojosama_

Just wanted to leave a positive review. I’ve been using this app to test the sound levels of the various environments I’m in, and it works well enough for my purposes, I just want to know when to pop-in ear plugs and if I do, whether to use my 16 SNR or 31 SNR rated ones. I also use it to make sure in not playing music too loud in the car or the house (both recorded music and musical instruments). The hearing test was an added bonus. I’ve had increasing tinnitus ever since high school, I always assumed I had some hearing loss and that my right ear was worse. I was surprised to find out my hearing loss is only in the highest frequency band in the LEFT ear and only very minimal. It really put my mind at ease especially since my tinnitus recently got worse and I am still waiting for my Dr appointment to have it checked out. I’m more optimistic that treatments will help preserve my hearing and hopefully counter the tinnitus as I had falsely presumed before I most likely had irreversible noise induced hearing loss.
Developer Response 03/15/2025
Thank you for your positive and detailed review. I really appreciate you taking the time to share your experience with the community and myself and I am very happy you found the Decibel app useful and convenient to use. I wish you all the best in your endeavors and in maintaining your hearing health. 🤗
Accurate as a phone app can get
06/08/2019

Julie12345678910111213
Thank you for this app. I was looking for something that could give me a general idea of the sound dB ranges in different locations. Since I only needed a general range for this project I looked for a free or low cost app. It worked better than I expected a phone app would be able to. I felt the need to leave a review as I am surprised at the amount of people that left negative reviews. The iPhone mic is quite different than a calibrated device that cost $100 and up. Not to mention variances in cases, dirt build up, people’s hand placement, even the direction the mic is being pointed at could slightly alter results. All that said this was accurate within 5db up or down in my results. Considering all I mentioned above that is pretty good. If you need something highly accurate for something of importance you should be looking into an calibrated device made for such things.

Developer Response
Thank you so much for your positive feedback. It's inspired.
Accurate as a phone app can get
06/08/2019

Julie12345678910111213

Thank you for this app. I was looking for something that could give me a general idea of the sound dB ranges in different locations. Since I only needed a general range for this project I looked for a free or low cost app. It worked better than I expected a phone app would be able to. I felt the need to leave a review as I am surprised at the amount of people that left negative reviews. The iPhone mic is quite different than a calibrated device that cost $100 and up. Not to mention variances in cases, dirt build up, people’s hand placement, even the direction the mic is being pointed at could slightly alter results. All that said this was accurate within 5db up or down in my results. Considering all I mentioned above that is pretty good. If you need something highly accurate for something of importance you should be looking into an calibrated device made for such things.
Developer Response 07/01/2019
Thank you so much for your positive feedback. It's inspired.
POS Full OF BUGS
12/20/2025

Why So Many Bad Apps?
It’s difficult to know where to start given how worthless this app is. And it is so full of bugs. On one of the pages you’re stuck with a huge map of the world I presume to show you where you made your recordings, but no one needs it, and it is completely worthless. Then when you try to play one of the recordings to recall what it was, half the time they won’t play. They won’t play whether you Select play on the main page or on the second page. In addition, you can’t fast forward. This recording app stupidly did not provide a means to fast-forward in one of the recordings. An elementary school student riding a tricycle could’ve done a better design job. Too much of the time nothing plays at all because it’s so full of bugs. And they don’t allow enough room. In the space for the subject of the recording to be able to provide a short but reasonable explanation so that you can find recordings later. Nor do they explain when you should use sound level C versus sound level A, nor do they explain when you should use fast response versus slow response.Truly, a POS app, avoid at all costs.

Developer Response
Thank you for sharing your feedback on using Decibel. Please allow me to start by saying that if there is ever any issue with the app's functionality, you can go to Settings-Feedback-Report a Bug. This way, I can get the report I need to address and fix any problems. You can also reach me by email at support@decibelpro.app. As regards the map issue, that might be due to the fact that you have not enabled geolocation for the app. There is also a fast-forward option for recordings, the only reason you may not see it is if the recording is only 1-2 second long. For explanations on weighting types, you can go to Help in the app or visit our website where you can find a lot of useful information: https://decibelpro.app/tag/articles/ I hope I've managed to address any issues keeping you from enjoying the app and you continue to use Decibel. Wish you all the best!
POS Full OF BUGS
12/20/2025

Why So Many Bad Apps?

It’s difficult to know where to start given how worthless this app is. And it is so full of bugs. On one of the pages you’re stuck with a huge map of the world I presume to show you where you made your recordings, but no one needs it, and it is completely worthless. Then when you try to play one of the recordings to recall what it was, half the time they won’t play. They won’t play whether you Select play on the main page or on the second page. In addition, you can’t fast forward. This recording app stupidly did not provide a means to fast-forward in one of the recordings. An elementary school student riding a tricycle could’ve done a better design job. Too much of the time nothing plays at all because it’s so full of bugs. And they don’t allow enough room. In the space for the subject of the recording to be able to provide a short but reasonable explanation so that you can find recordings later. Nor do they explain when you should use sound level C versus sound level A, nor do they explain when you should use fast response versus slow response.Truly, a POS app, avoid at all costs.
Developer Response Jan 25
Thank you for sharing your feedback on using Decibel. Please allow me to start by saying that if there is ever any issue with the app's functionality, you can go to Settings-Feedback-Report a Bug. This way, I can get the report I need to address and fix any problems. You can also reach me by email at support@decibelpro.app. As regards the map issue, that might be due to the fact that you have not enabled geolocation for the app. There is also a fast-forward option for recordings, the only reason you may not see it is if the recording is only 1-2 second long. For explanations on weighting types, you can go to Help in the app or visit our website where you can find a lot of useful information: https://decibelpro.app/tag/articles/ I hope I've managed to address any issues keeping you from enjoying the app and you continue to use Decibel. Wish you all the best!

• 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.

Version 9.5.3

4d ago

In-App Purchases

Spectrum Analyzer Pack

Full access to FFT, Spectrogram & Octave RTA

$24.99
Decibel Meter Pro

Save. Export. Get access to dB-A, C, Z

$19.99
Noise Dosimeter Pro

Get notifications & measure in background

$9.99
dB Meter Premium Pack

Lifetime access to all features

$49.99

Data Linked to You

The following data may be collected and linked to your identity:
- User Content
Data Not Linked to You

The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Purchases
- Location
- Identifiers
- Usage Data
- Diagnostics