Duplicate Content Checker
Important information for affiliate marketers
SEO Tools: Similar Page Checker
How it Works
Search Engines are known to act upon websites that contain Duplicate / Similar content.
Always use Duplicate Content Checker for your own protection.
Your content could be similar to other websites on the Internet, or pages from within your own website could be similar to each other (usually the case with dynamic product catalog pages).
This tool allows you to determine the percentage of similarity between two pages.
The exact percentage of similarity after which a search engine may penalize you is not known, it varies from search engine to search engine, Your aim should be to keep your page similarity as LOW as possible.
For more useful tools check this website.