What does this tool do? This tool analyzes a web page, searching for characteristics that search engines could consider spam. If you don't know what "search engine spamming" means or if you want to know how this tool works, you can read the Spam detector FAQ.
Why did you create this tool? To persuade webmasters and SEO to think: if I have been able to create a simple tool capable of intercepting some techniques of spam, imagine what a team of engineers, working for a search engine, could do!