Price: The Yoast SEO plugin for WordPress is free. The premium plan starts at $89 for 1 site (includes 1 year free updates and support) Yoast SEO is an excellent tool to help me optimize my content and boost my ranking in Search Engine Results Pages. Enter the keyword or key phrase I had like my post or page to rank for in search results. The plugin will run a check on my content to check whether I am using the keywords often enough and in the right spots. In the Premium version, I can add related keywords to the tool. It will analyze my text for these keywords and all variations of the original word or phrase and thus take SEO content optimization to the next level.