Link Popularity is one of the most important factors in the success of your website. Almost all major SEs consider inbound links from a given website A as a vote from this website to you.

Being able to measure your link popularity (as well as measuring your competitors one) is very important, as it gives a good indication on whether a website is considered as a new "amateur" website or among "authorities".

SEO Report automatically retrieve link popularity from major search engines, calculates total and highlight websites according to their link popularity.
In addition, SEO Report is able to display a chart that shows link popularity progress over time for any given website.

Regarding color highlighting, simply said: the darker, the better (except for websites with more than one million links back, these are underlined in blue).