Fetch a URL and analyze its SEO meta tags. Returns title (with length check), meta description, Open Graph tags, Twitter Card tags, canonical URL, and actionable issues. Use this to audit any page's on-page SEO.

Fetch and parse a site's robots.txt. Returns user-agent rules, allowed/disallowed paths, sitemap directives, crawl-delay, and issues. Use this to check what search engines can/cannot crawl.

Validate a sitemap.xml file. Returns URL count, format (XML/index/text), sample URLs, last modified dates, and issues like duplicates or missing lastmod. Pass a domain to check /sitemap.xml, or a direct sitemap URL.

Analyze text for keyword frequency and density. Returns top single words, bigrams, and trigrams with percentages. Optionally check density of a specific target keyword. Use to optimize content for target keywords.

Score text readability using Flesch-Kincaid metrics. Returns Flesch Reading Ease score, grade level, word/sentence/syllable counts, average sentence length, reading time, and actionable tips. Use to ensure content matches your target audience.

Analyze a page's heading hierarchy (H1-H6). Returns the heading outline/tree, counts per level, and issues like missing H1, multiple H1s, or skipped levels. Use to verify content structure for SEO and accessibility.