You can just drag some wave files onto the window and it does some useful offline measuring for you showing LUFS, DR, True Peak values and so on and also shows possible problem areas according to the presets you chose like Mastering for Spotify or CD or whatever.
You can edit the presets to your needs also.
Got this on sale for around 19 bucks I think, really nice tool to have.
I analyzed some submission for our mastering challenge for fun:
