Is there any software for monitoring sound (loudness) levels playing through a PC?

[exist01]

I often wonder how objectively loud something that's playing on the computer is, but I don't want to have to record it through stereo mix, drop it in the DAW, and analyze it. It would be much more convenient if a software was monitoring the PC's audio output and actively displaying stats such as loudness and whatnot, much like an analyzer might do in a DAW. So I'm wondering if such an app/software exists.

[darkinners]

Youlean

[exist01]

Youlean

Woah I didn't know Youlean Loudness Meter could be used as a standalone app to measure overall PC levels! That's perfect!