@Steve_SmithJun 14.2013 — #There are various sites which provide SEO report of your or any other site. On those site you have to just enter url, they will provide complete analysis of the url like backlinks, social networking accounts, page rank, page size, backlinks, errors and many more.. one such site is woorank, superseo and so on..
@web901Jun 15.2013 — #I use Majestic SEO, it has many useful tools apart from comparator tool. There you can get an estimated number of your competitor`s backlinks and compare data
@kpkarthikJun 15.2013 — #There are so many tools are available for check the backlinks in Google search engine.But that all tools are not provide the exact counts of backlinks of your competitors websites.
There are many back link checker tools are available but my opinion most popular and great tool is Link diagnosis. It’s get wide variety of link result And also a brief about page rank distribution of your site.