Castillo SEO

On-page SEO: meta, headings, links, images, Open Graph and HTTP codes. Issues shown on the toolbar icon.

Castillo SEO analyzes the page you have open and shows a clear on-page SEO report in one click. No account. No cloud. Everything runs in your browser. Open the extension on any http or https page to see a score, a checklist, and the issues that usually hurt visibility in Google. WHAT YOU GET • SEO score and a pass/fail checklist for the current tab • How the page would look in Google (title and meta description) • Meta tags: title, description, canonical, robots, language, viewport • Heading structure (H1–H6), hierarchy issues, and copy/download as an image • Social / Open Graph and Twitter Card tags • Internal and external links, nofollow, and images missing alt text • Technical checks: HTTPS, www vs non-www, robots.txt, sitemap, optional llms.txt • HTTP status on the toolbar icon (301, 404, 500, and similar), with SEO issue count when there is no HTTP error • Client-ready report you can copy (useful for WhatsApp or email) • Google site: search for the current URL • Language: Same as Chrome, Spanish, or English HOW TO USE IT 1. Open the page you want to check. 2. Click the Castillo SEO icon. 3. Review Overview, then open the other tabs for details. 4. Use Refresh after you change the page. Copy report to send a summary. Settings lets you set title and description length ranges. PRIVACY Castillo SEO reads the active tab to build the report and stores only your preferences (language and length settings) on your device. It does not send page content to our servers and does not sell data. Privacy policy: https://github.com/andrescastillo1985/castillo-seo/blob/main/privacidad-castillo-seo.md WHO IT IS FOR SEO consultants, agencies, and site owners who need a fast on-page check before sending a page live or briefing a client.