Keywords and keyword density are common terms in SEO . You want to know your keywords and keyword density for your Web pages and your competitor pages. SEO Keyword Spy is a PHP class you can plug in to your programs that saves you time with keyword analysis functions. The tool even has a graph you can use to print out analysis and display it on the screen, or you can retrieve the keywords and use them in your own programs. Features: - Retrieve keyword phrases from a URL - Get percentages (keyword density) for each keyword in the URL content - Display a graph that shows the most common keywords and the keyword density or use the keyword density for your own program’s purposes - Get plain text content you can use to store in a database - Filter out common keywords you don’t need - Customize the keywords you want to filter out using the stopwords.txt (some common words already included) - Requires cURL