You indicate you are in beta right now, do you plan to stay always free or will you offer paid tier later?
It's hard to see how you're different from upverter.com in the end and what would be one (or more) killer feature(s) that make your solution the one to use in th end ?
Our biggest differentiator from upverter is that we allow to build electronics using pre-design circuit "modules" (which are also already routed as a sub-PCB) other people in the community. We believe this can drastically accelerate electronic design, up to a point where people with no electronics background can start designing circuits.
We also have PCB layout functionality from the start and plan to offer PCB ordering service very soon.