Serpline: SEO Checker & AI Crawler Audit for Google, ChatGPT & More

Technical SEO, JavaScript render and AI crawler checks for the page you're on. Free, no data collected.

See your page the way Google and AI do. Serpline checks the page you are on: the technical SEO basics, what only shows up after JavaScript, and which AI crawlers are allowed to read it. Click the icon (or press Alt+Shift+S) and a side panel opens next to the page with a score, the issues and the fix for each one. SUMMARY - One SEO score out of 100, weighted by priority - A clear answer to "Can Google index this page?" from the status code, noindex, robots.txt, canonical and sitemap - The on-page basics Google reads first, from the title and description to structured data, each with a clear status - Structured data checked against Google's rich result rules: what is missing for Product, Article, FAQ, Breadcrumb and more - hreflang codes, the self link and the return links of the other language versions - Google preview for mobile and desktop, measured in pixels, with the exact point where Google cuts the title and description HEADINGS - The H1 to H6 outline with skipped levels and duplicate H1s - Headings that exist only after JavaScript are marked - "Highlight on page" outlines every heading and every image without alt text right on the page LINKS - Internal, external and nofollow links with their anchor text - A real status check of internal links from your browser: broken links (404, 410, 500) and redirects - Links without text, vague anchors like "click here" and nofollow on your own pages, highlighted right on the page SPEED AND MOBILE - Core Web Vitals of your visit (LCP, CLS and INP) with Google's thresholds, plus first paint and server response time - Page weight by type and every image that is too heavy, bigger than shown, in an old format or lazy-loaded at the top - Mobile checks for the viewport, sideways scrolling, tiny text and small tap targets - The server response: HTTPS, compression and caching headers RENDER - The raw HTML next to the rendered page, signal by signal, to see what crawlers miss - How much of the text needs JavaScript, and exactly what is added by scripts - What AI crawlers see: the share of text, the heading and the schema they can read, and the first words they get AI - Which AI search and training crawlers the site's robots.txt allows or blocks, grouped into search bots and training bots - The exact robots.txt line behind every block - robots.txt, sitemap and llms.txt at a glance AUDIT PDF - One click turns the findings into a prioritized report with every issue and its fix, ready to send to a developer PRIVATE BY DESIGN - No account, no server, no analytics inside the extension - Serpline reads only the page you ask it to check. It fetches that page's raw HTML and the site's robots.txt, llms.txt and sitemap from your browser - Link, canonical and hreflang checks go only to that same site - Only your settings (language, preview device, link check on open) are saved, and only on your computer - Minimal permissions: active tab, scripting, side panel and local storage. Access to a site is asked for only when you choose it, one site at a time - Open source: https://github.com/shemistanisayev/getlineapps Free, with no paid plan and no usage limit. Built by Shamistan Isayev, technical SEO and analytics consultant. Need help fixing what Serpline finds? https://shamistanisayev.com