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I don't know if you have implemented analytics identifier comparison, but I thought that analyzing https certificates could be a good option. Always with the aim of tracking down a competitor.I think if an analytics or https occurrence is found between two sites, a color could be used.
@Kaine: Do you mean that we can find out which T1s are owned by the same SEO companies, much like you can use G00G AdSense IDs to find a company operating multiple sites? Still not getting it!
@z3r, thanks for the report...will get fixed in next update.proxies: are they testing fine in our tool as well?
@z3r did you hit Refresh? For that API calls, no proxy is used anyway.
@z3r latest update should fix the issue for you.