SEO and marketing utilities let you check your work before it goes live: previewing how a page title and description will appear in search results or when shared on social media, validating structured data, inspecting redirects and headers, building UTM-tagged links, and scoring readability.
These are diagnostic tools rather than strategy tools. Their value is catching concrete mistakes such as a title truncated in search results, a missing Open Graph image, a redirect chain, or a canonical tag pointing at the wrong URL. Run them on a page you are about to publish and you will find issues that are far more expensive to fix once a page is indexed.