Would you like to know how loud the TV, music or the environment is?
Or your neighbour is too loud? With Decibel Ultra you know it precisely!

• • • Decibel Ultra • • •

- Would you like to know how loud the TV, music or the environment is?
- Or your neighbour is too loud? With Decibel Ultra you know it exactly!

- Decibel Ultra measures the volume and helps you figure out how big the noise level compared to reference values.

- Calibrate with Decibel Ultra all your surround speakers to the same level.

Decibel Ultra measure the sound pressure level (SPL) in dB professional frequency weightings: A, B, C, D ,Z (flat) and time weightings: Fast, Slow, Impulse.

- Perfect to tune guitars.
- Send the results quickly via email.
- interested how loud you are?
- Ultra-precise measurement of frequencies, a sine of 1000.0 Hz appears really as 1000.0 Hz!
- Calibrated to the internal microphone, equipment enclosed headphones, MicW microphone or with line-in. Decibel Ultra is calibrated to standard 94dB at 0776 Vrms / 1000 Hz.

Decibel Ultra was calibrated with a Class 1 Sound Level Meter and calibrator! From device to device, it may still be fluctuations around a few dB (2-3 dB). The app set the device into a special, best possible measurement mode. The automatic gain control (AGC) will turn off to get clean measurement without distort signals. On some older devices, the AGC can not turned off by software, it will then automatically corrected in the calculation.

Depending on the unit generation, it varies how sensitive is the device. For example the current iOS devices e.g. iPhone 6 (plus) the internal microphone of an iOS device can not perform any measurement below 30 dB. Measurements below 40 dB with an external microphone or via the headphone jack supplied line output, are not possible with this current devices. The headset that came with the iOS device, cannot measure below about 44 dB. This is a limitation of the current device. But hey, 30 dB is already really sensitive!

Highly recommended is the MicW i436. It has a very linear frequency response and dynamic, ideal for precise professional measurements.

Continuous noise can be a potential hazard to your health!

I would like to thank the company MicW Audio and Synthax GmbH for their kind support.

Free version. The ad-free version is called "Decibel Ultra pro" here in the iTunes Store.

What’s New

Version 3.5

This app has been updated by Apple to use the latest Apple signing certificate.

- bug fixes
- calibration data for iPhone 8 and iPhone X
- support for iOS 8 - iOS 11.x

Ratings and Reviews

2.6 out of 5
42 Ratings

42 Ratings

Cajah ,

Best features but doesn't open anymore

Doesn't work on ios14. App won't open

Kieran ennis ,

The perfect app for curiosity!

I got this app because the other DB app became bombarded with full screen ads.

I am happy that there is a free version without any time limits on how long you can run the app, and the bottom banner ads are fine with me, it is the full screen ads that I dislike.

However due to there only being one full screen ad on startup followed by non stop banner ads, I am very pleased with this.

I can leave the app running while it cycles through the banner ads, the developer gets money, and I don’t have to deal with annoying pop-ups! It is wonderful!

The translations are a bit confusing , but there is enough there to understand what they are trying to say.

The interface and data is displayed wonderfully! Not too simple, but not overwhelmingly complicated, and if you need help, there is a button that explains what everything means.

In short it is a wonderful app that successfully has gotten its own spot on my home screen, and it won’t be going anywhere anytime soon.

Keep up the good work!

Edit: the app doesn’t work with iOS 12 anymore. Please update.

Mistersmileypants ,

The Best sound dB Meter on iOS

This app is perfect for the sound I have been doing at my church allow us to see how loud we are running a Sunday worship service. The readings are accurate and the frequency spectrum is a huge plus. Well developed and highly recommended!

App Privacy

The developer, Patrick Schaefer, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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