Looks great! I have tried a couple of complicated websites and it always returned accurate results and it seems really fast. We'll try to implement it on smartmockups.com to compare it with our currect solution ;)
Was literally looking for one of these types of services today so I figured I'd give this a go. Works great - I hope it sticks around because I'm lazy and can't be bothered to move to a new service. Feature request: An option to turn HTML into a screenshot, rather than url -> screenshot. Awesome work anyway!
stoic.
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