With its help you can just select a number on a web page which you want to track, right-click on it and select “Add to Rival Alert” menu item – after that this number will be added to the Rival Alert, and its updates will be tracked every day, so that you would be able to keep an eye on the value’s changes:

The same can be done for FeedBurner counter images – just right-click on it and ”Add to Rival Alert” menu item.

Rival Alert is a data scraper that keeps track of statistics located on public web sites: forum registrations count, page visits, stock price or number of search results — any kind of numeric data.

Bloggers! There is a cool feature for you — Rival Alert can parse FeedBurner counter images so that you could know how popular other bloggers are.

You can find out more here.