Would love to read your perspectives on the participating plugins:
https://www.kvraudio.com/...eloper-challenge/2016/

I really like the Loudness Meter...it's very clean and easily readable...

Haven't checked it yet...but Devicer might a be a good FREE
alternative to MixChecker at over $100...

SoftAmp PSA is my favorite so far.
 
Roth-Air is pretty good, too. It won't be replacing the iZotope exciter or FabFilter Saturn, but if you don't have  a fancy HF exciter this would be a nice addition to your coloring crayon box. Just don't go nuts with it, as using it on many tracks will end up sounding like the spaces between your toes feel after a day at the beach.

I've been wanting a good loudness meter. This one looks good. Thanks for the heads up.

+1 on Youlean loudness meter.
 Pleasant, easy-to-read graphics.

Wavesfactory (of Mercury repute) has a snare thing going:
https://www.kvraudio.com/...lenge/2016/#dc16-12774

Youlean Loudness meter is very nice but it crashed while using it in SONAR on me.   It was working but I fiddled a audio track (added a new audio loop I think) and it went down when I hit play.  Visual Studio had it as a crasher.  Has it been updated since the initial release?
 

There is a v1.0.1
Changelog:
v1.0.1:
Fixed missing libraries on macOS.
Fixed volume boost in FL Studio.
Fixed FL Studio crash while detaching the plugin.
Fixed Reaper crash after play in Windows.
Fixed minor graphical glitches.
 
The developer's thread http://www.kvraudio.com/forum/viewtopic.php?f=6&t=474553
 

The new 1.0.1 version of Youlean's Loudness Meter, hasn't crashed yet.  Seems to produce numbers very close and/or identical to iZotope's Insight.  Very nice.