Instead of a pixel based drawing comparison here's a more Direct approach that compares the actual contents of the drawings like Views, Text, Balloons, Shading, View Scales, etc.
I'd say this is a 'Synchronous' approach to Drawing Compare.
This looks to be a much more powerful tool than anything I have ever seen.
Everything i've seen is only a pixel based image compare.
I'm sure some could really use a tool like this...
and some, like our company, dont have quie the need as we are not a regulated industy. we are only designing our own internal machinery...
This looks very promising and I look forward to seeing more!!!