iPhone Screenshots


"Sound Level Analyzer Lite" is a sound level meter app for iPhone.

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.

In the latest version, Time course graph function have been added as a new feature.

Features :
- Sound Level Measurement function:
"Leq" (equivalent continuous sound level),
"Lmin" (Minimum sound level of Leq),
"Lmax" (Maximum sound level of Leq),
"Lavg" (Long-term average equivalent sound level).
- Time course graph function :
"Bar chart" - Leq,
"Green line" - Time average level, Lavg(All time),
"Orange line" - Moving time average level(5 sec).
- Display range : 0 - 130dB (measurement range: 20 - 110dB)
- Frequency weighting : A and C weighting filters, Z (None weighting)
- Time weighting : Fast=125ms / Slow=1.0sec
- Calibration function : -20 - +20dB / 1dB unit
- Measurement time : 20 sec

Example of Noise level :
- 130dB : airplane engine sound
- 110dB : horn of the car
- 100dB : train passing sounds
- 90dB : noisy factory
- 80dB : on the train, vacuum cleaner
- 70dB : noisy office, street
- 60dB : quiet car, normal conversation
- 50dB : quiet office
- 40dB : library, quiet residential area
- 30dB : midnight suburbs, whisper
- 20dB : sound of rubbing leaves

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.

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.

The authorization for access to the built-in microphone will be confirmed by the iOS system at first boot. Please enable access to the microphone.

TOON,LLC is a company that seeks the comfort of sound environment based on our acoustic proprietary technology, and we will provide tools for audio professional, sound technology, home theater installer, and anyone who loves audio.

Please visit our iOS App Support page for more information on this app.

What's New

Version 3.2

- Minor bug fixes.
- Requires iOS11.3 or later.

Ratings and Reviews

3.3 out of 5
7 Ratings
7 Ratings

Does not record sound actively

Nickname choices

I tried this out in a very noisy environment and it did not register any sound. There are no instructions or settings that I could find. I assume it does not work with my iphone 5s.

Auto rotate gone, up 4 steps back


Ability to auto rotate gone. To see the screen and point the mic is not possible any longer.

UI looks much worse.

Crashes on iPhone X


Crashes back to iOS when starting to listen on iPhone X

Deleted and reloaded app, still crashes
That’s all I have to say, this used to be a great app.


2.9 MB
Requires iOS 11.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+


  • Family Sharing

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

More By This Developer

You May Also Like