• • • Decibel Ultra pro • • •

Would you like to know how loud is your music or your TV? Or is your neighbour to loud? With Decibel Ultra pro you know it exactly!

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

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

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

- Perfect to tune guitars.
- Send the results quickly via email.
- Interested in how loud is the noise you?
- Via headphone jack supplied line output is calibrated to 94 dB at 0776 Vrms / 1000 Hz
- Ultra-precise measurement of frequencies, a sine of 1000.0 Hz appears really as 1000.0 Hz!

Decibel Ultra pro 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.

What’s New

Version 3.4

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

Ratings and Reviews

4.5 out of 5
4 Ratings

4 Ratings

Danchyk123 ,

IOS 14 update has temporarily broken this wonderful app for now...

Hopefully the app will be updated soon. Excellent when it works!

One Room Shed ,

Thanks for the update !!!

Got and update for iOS8 and now the app works again. This has always been my favorite dB app. It's got every function I could need and more. Love the layout of this app. I will always recommend this to anyone shopping for a dB meter app. It's one of the best in the App Store. Thanks for the update. It works perfectly.

Wiesiu33 ,

Very nice app

Great app and works very well. Please update app so it fits the new large screen on iPhone 11 Pro Max with NOTCH.


Patrick Schaefer
12.9 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian

Age Rating


  • Family Sharing

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

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