SmarterNoise Pro1.028 - App Store

SmarterNoise Pro is the most advanced edition of the SmarterNoise recording sound level meters. SmarterNoise Pro edition is developed especially with more advanced measurements in mind, and includes many requested features such as a frequency spectrum display, export of measurement data, A-, C- or no weighting for sound level measurement, and full screen audio mode. SmarterNoise Pro edition does not contain any advertising, and performs accurately and fast.
Features:

. Sound level measurement in video mode

. Sound level measurement in audio mode

. Sound meter snapshot camera

. Record video and audio files (paid function)

. Recording timer

. Sound level activated audio recording

. Frequency spectrum display (paid function)

. Peak frequency detection

. A-, C- or no frequency weighting

. Export of measurement data in CSV format

. Full HD (paid function), HD and VGA video resolution

. Three video quality settings

. Archive for saved files

. Sharing of saved files

. Calibration

. Save location of measurement (optional)

. Time and date

. Continuous Leq, LAeq, LCeq value

. 10 second sound level average (Leq, LAeq, LCeq)

. 60 second sound level average (Leq, LAeq, LCeq)

. Maximum and minimum decibel level
About decibels and sound level measurement

The unit for measuring sound is called a decibel. Because the decibel scale is logarithmic, a sound with an intensity that is twice that of a reference sound corresponds to an increase of about 3 decibels. The reference point of 0 decibel is set at the intensity of the least perceptible sound, the threshold of hearing. On such a scale a 10-decibel sound is 10 times the intensity of the reference sound. Highlighting this is important as already a few decibels higher or lower makes a noticeable difference in how noise is perceived.

The preferred method to describe sound levels that vary over time, resulting in a single decibel value measuring the total sound energy over the period, is called Leq. It is however common practice to measure sound levels using A-weighting, which attenuates lower and higher frequencies that the average person cannot hear. In this case the value is called LAeq.

A- and C-weighting

The A-weighting is a standard, commonly used filter that attempts to alter the measured sound pressure levels to more closely match the perception of the human ear. A-weighting makes the sound level meter less sensitive to very high (over 8000 Hz) and low frequencies (below 1000 Hz).
C-weighting also attenuates low and high frequencies, but the attenuation of low frequencies is much less severe compared to A-weighting.

Calibrate:

Calibrate the application using the calibration tool found in the settings menu. Phones and their components vary in quality and setup so you need to calibrate the app in order for the results to be relatively comparable. One suggestion is that you close the window and door to your bedroom or bathroom, turn off appliances, and once its very quiet calibrate the app so the reading is about 30 decibel.

Version History Improved handling of errors in video recording. 1.028 Jul 13 Fixed a crash that occurred on some iPhone models when stopping video recording. 1.027 Jun 25 - On audio recordings, the spectrum display now updates when playback is paused and the playback position is changed.
- The spectrum graph display can now be zoomed by pinching and scrolled by dragging.
- Fixed the seek sliders not working on iOS 26.
- Added Polish translation. 1.026 Jun 15 - Added Dutch translation.
- Fixed fullscreen mode on iPhone 16 models. 1.025 07/24/2025 - Added a new display type to the live decibel graph: one-second boxes with optional minimum and maximum level display.
- Added a setting for automatically starting measurement, without having to press the 'play'-button.
- Improved synchronization of saved audio and the decibel graph. 1.024 06/21/2025 Fix some crashes related to saved audio measurements. 1.023 08/21/2024 - Improved the handling of devices with no camera.
- Fixed a crash that occasionally happened when stopping or resetting measurement in audio mode. 1.022 06/15/2024 - The decibel graph on saved audio recordings can now be zoomed smoothly by pinching. The decibel graph has also been changed to make it easier to see peaks in sound levels.
- You can now change the video playback position by dragging the video image. 1.021 05/28/2024 - The spectrogram range setting was removed. Instead, zoom the spectrogram by pinching and scroll by dragging. In camera mode, long clicking on the spectrogram enables you to interact with the spectrogram, instead of zooming the camera.
- You can now apply the selected weighting mode to the spectrum analyzer input. 1.020 02/22/2024 - Scrolling of the live decibel curve was made smoother. Smooth scrolling can be disabled from the settings.
- The leq curve on the live decibel graph can now be hidden.
- Added medium speed decibel value update setting.
- Added an option to set the live decibel graph display duration to 15, 30 or 60 seconds.
- Added an icon to new measurements in the archive that haven't been opened yet.
- Fixed a crash that occasionally happened when opening long measurements. 1.019 01/25/2024 Improved the animation of switching to dual view mode. 1.018 03/22/2023 - You can now add text notes to measurements.
- You can now view the decibel graph and spectrum analyzer at the same time in audio mode.
- The recording timer is now started by a long press of the record button. 1.017 03/11/2023 - For audio recordings, added the option to sync the decibel graph view to the playback when zoomed in. 1.016 10/26/2022 -Added sound level activated recording. When in audio mode, tap the icon in the title bar to start.
-Deleting multiple measurements was made more convenient 1.015 08/26/2022 Measurement now continues when the app goes to the background if the background measurement setting is enabled. 1.014 08/05/2022 Fixed low volume playback after automatic save. 1.013 04/28/2022 Added adaptive decibel range setting for the live decibel graph. 1.012 04/16/2022 -Added option to set the opacity of the background of indicators in video mode.
-Added setting to display time in the decibel graph as clock time. 1.011 03/17/2022 - The archive can now be sorted by name, date, average level or length.
- Improved handling of interruptions during recording or playback of audio. 1.010 02/09/2022 The spectrum analyzer can now also be used to analyze saved audio recordings. 1.009 01/12/2022 -Added audio bit rate settings
-The app now starts in the previously used mode 1.008 11/06/2021 You can now set the audio playback position by doing a long press on the decibel chart. 1.007 04/17/2021 Fixed a memory leak and did some performance improvements related to longer recordings. 1.006 01/11/2021 –The measurement save interval can now be selected from three options
–Decibel graph can be shared as an image
–Other smaller improvements and fixes 1.005 11/22/2020 Fixed a layout issue and enabled deleting of individual measurements in the archive screen. 1.004 03/29/2020