APU Software has introduced a free dynamic range analysis plugin for Windows and macOS. The APU Loudness Meter supports variety of loudness types: LUFS, RMS, True Peak, and Peak.
This plug-in is designed to provide both real-time monitoring and full histogram analysis of your audio’s loudness over time.
APU Loudness Meter is free to download in VST and AU plugin formats, as well as standalone software.
More information: APU Software