Inspired by last year's Balsamiq + UX.StackExchange integration http://news.ycombinator.com/item?id=3639047 we were happy to put this together for the electronics community! Thanks to the StackExchange team and community for being so helpful in accomplishing this integration.
I've recently started tinkering with my Arduino again, and was going to start looking for a tool to build some basic schematics online. Good timing; CircuitLab looks awesome!
I've followed CircuitLab for some time with interest. Fantastic product, really great idea for an integration. Makes me wonder where you've left the room for premium features?
They're pretty different use cases. Upverter is about circuit layout for the purposes of making PCBs; CircuitLab is for simulating, especially to better understand timing, analog stuff, etc.