Just had a quick glance. Could'nt really figure out what your service was trying to do. Looks to me like you let people search through spreadsheets/dbases and also show keyword density clouds. You definitely should write some clear and concise copy for your landing page.

Simply put: TextRAR let you transform any spreadsheet into searchable data; you can either share the search page or use the API to integrate with your application.

The sign up page could be redesigned...but I am sure it is work in progress

Is this like Dabble DB? The first impression I got and on that note the whole idea could be clarified a bit some sort of elevator style pitch.