Check out an integrated loudness analyzer and peak sound manager. Work with configuration options for analysis and processing of selected files, discover the loudness range, integrated values, and maximum true peak indications for optimization and adjustment.
Download of r128x 0.3 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The program lies within Audio & Video Tools, more precisely Editors & Converters. This free Mac application is a product of audionuma.
From the developer:
r128x is a tool for measuring Integrated Loudness, Loudness range and Maximum True Peak of audio files on the Mac OS X system with an Intel processor. It uses CoreAudio's AudioConverter service to oversample audio data and obtain the Maximum True Peak.
You may want to check out more software for Mac, such as MFilter, Aiseesoft WMV Converter for Mac or AkBrowser, which might be similar to r128x.