Sound Level Analyzer Lite


"Sound Level Analyzer Lite" is a sound level meter app for iPhone. It is a free app that has simplified the function of "Sound Level Analyzer".

Available in variety of applications as the neighboring environmental noise measurement, audio system check, vehicle interior noise check, sound check of live events, and more.

This app can easily set the frequency weighting characteristic and the time weighting characteristic necessary for sound level meter, and appropriate sound level measurement is possible. It also has the calibration function to adjust the microphone level for each device.

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The WHO has proven direct links between noise and health risks; tinnitus, sleep disturbance, stress, cognitive impairment, heart diseases and annoyance in general. Please check your environmental noise for your wellness.

"Sound Level Analyzer" has received the highest rating as a sound level meter app in the research paper of acoustic academic journal "Applied Acoustics". (Paper: ”Testing the accuracy of smartphones and sound level meter applications for measuring environmental noise”, Enda Murphy, Eoin A. King ; Applied Acoustics 106(2016)16-22.)

In addition, our high grade app "Sound Level Analyzer PRO" has a powerful sound / noise analysis function in addition to the sound level measurement function, so please consider using these apps for your advanced requirements.

Please to click the following link to Free download "Sound Level Analyzer Lite" from App StoreTM. It will be open the download page on App StoreTM.

It will move to another site, download from Aplle Store

Communications charges when connecting to the App Store will be borne by the customer.
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Products Information

Version : 5.2
Release date : March 26, 2021. UTC
Size : 3.1 MB
Recommendation : Requires iOS 12.5 or later.
Category : Utilities, Life style


Sound level measurement (dB)

- Leq (equivalent noise level), Lmin (minimum value), Lmax (maximum value), Lavg (time average equivalent noise level)

- Frequency weighting correction characteristics : A (for noise level meter), C (for sound level measurement), Z (no correction)

- Time weighting characteristics : Fast = 0.125 sec, Slow = 1.0 sec

- Display Range : 0 - 130dB

Calibration function : level correction value settings, -20 to +20dB / 1dB unit
Measurement duration : 20sec


"Sound Level Analyzer" can be used with the following applications:

Live Sound
Environmental noise measurement
Setting and Tuning of Audio system
Installation of Audio equipments
Installation of Car audio equipments
Architectural acoustics
Device management

In addition, the followings are examples of the magnitude of the sound level in the measurement of environmental noise.

130dB : Engine sound of Airplane
110dB : Horn of Car
100dB : Noise of passing train
90dB : In loud factory
80dB : In the train, Vacuum cleaner
70dB : Noisy office, Noisy street
60dB : Quiet Car, Normal conversation
50dB : Quiet office
40dB : In the library, Quiet residential area
30dB : Outskirts of midnight, Whisper
20dB : Sounds of rubbing leaves

Important initial settings (iOS permissions)

In order for this app to work properly, it is necessary to make the following initial settings related to the iOS system.

Microphone access permission setting

At the initial startup after installing the app, the iOS system asks for permission to access the built-in microphone. In this case, you need to enable access to "Microphone".

If you have not enabled this setting, this app can not work by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy > Microphone".

Sound Level Measurement

This app makes the sound level measurement in general. In this case, by applying the appropriate Frequency Correction, Time Correction, and Level Correction, you can be the best sound level measurement.

By tapping play button to start the sound level measurement, and it then stop by tapping it again.


Sound level measurements are displayed measured values of equivalent continuous sound level (Leq), minimum value (Lmin), maximum value (Lmax) and time average equivalent noise level (Lavg) in dB units. Leq is also displayed as a bar graph.

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It can be measured as parameters, Time weighting correction, Frequency weighting correction, and Level calibration, to set as follows:

[Time weighting correction]

It specifies the time constant of calculating the sound level. Please set in accordance with the occurrence tendency and type of sound source.

FAST : 0.125 sec (Default)
SLOW : 1.0 sec

[Frequency weighting correction]

It is a weighting filter that limits the frequency band of the input signal. Please set according to the measurement applications.

A : A correction - Noise measurement by general audibility correction (Default)
C : C correction - Sound pressure level measurement for wideband sounds and music
Z : Non correction

[Level Calibration]

You can specify the reference level in the offset range. Tap "Setting" button, the calibration input window will appear. If you have a standard sound level meter, please use it to adjust the reference level.

Offset ranges : -20dB to +20dB in 1dB unit


Product Information

By tapping "Setting" button, it is displayed the product information and function description. If you tap "Support/Information" button, Safari starts and you can see our support page. And if you tap "Upgrade info" button, AppStore app starts and you can see our product page.

By tapping "Close" button, it will return to the previous measurement view.

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Release Information

Version 5.2 was released on March 26, 2021. UTC
Version 5.1 was released on August 23, 2020. UTC
Version 5.0 was released on May 21, 2020. UTC
Version 4.1 was released on March 28, 2019. UTC
Version 4.0 was released on November 14, 2018. UTC
Version 3.2 was released on May 18, 2018. UTC
Version 3.1 was released on March 15, 2018. UTC
Version 3.0 was released on February 27, 2018. UTC
Version 2.4 was released on January 23, 2018. UTC
Version 2.3 was released on May 17, 2017. UTC
Version 2.2 was released on June 2, 2016. UTC
Version 2.1 was released on March 4, 2016. UTC
Version 2.0 was released on December 21, 2015. UTC
Version 1.4 was released on December 4, 2015. UTC
Version 1.3 was released on March 24, 2015. UTC
Version 1.2 was released on September 3, 2014. UTC
Version 1.1.1 was released on July 13, 2014. UTC
Version 1.1 was released on June 23, 2014. UTC
Version 1.0 was released on June 10, 2014. UTC


The standard noise measurement range is 30-130 dBA, and even in a quiet room, the measured value is approximately 30 dBA. In any silent environment, it will not be measured with very low noise levels, such as 0 dBA.

This app is adjusted the reference value for iPhone. However, the built-in microphone of your iPhone is likely to have a non-uniform gain. The more exact measurement should be calibrated using the absolute level calibration devices.

Request for review

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Contact us

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Support contact : support_ap*

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Please contact us with the following details if you have any requests or problems.

1. Application name
2. Device model
3. iOS version
4. Country you live
5. Details about your requests or problems.

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