Free Link Popularity Check (LPC) used to be a software tool for Windows computers. LPC used the backlink data of Google, Yahoo and other search engines.
Unfortunately, that information is less reliable than the information that we use now (details can be found here). For that reason, we discontinued the Windows software tool and created a new online service.
With our new online service, you get many more backlinks than before and the backlink numbers are much more accurate then the diluted numbers that you get from search engines.