This is an “OMG" product.

I am, at heart, a systems architect and coder. As a non-artist forced to cobble together assets for development projects, I had previously found xScope quite useful. xScope 4 takes it to a new level. I find my brows rising as I use it because this is an amazing little tool. If you do graphics or screen layout, you will not regret having this in your tool belt.

Curious Rabbit about xScope 4