Audit and fix your site’s technical SEO right in your codebase — a free, AI-powered SEO checker and analysis tool built on Claude Code. No crawler, no hosted dashboard, no signup.
/plugin marketplace add clauderegistry/marketplace/plugin install seo-optimizer@clauderegistry/seo-audit ./srcPowered by the seo-optimizer plugin.
A comprehensive technical SEO audit across ten categories, scored 0–100 with every issue ranked by impact.
Presence, length (50–60 / 120–155 chars), uniqueness, and keyword relevance.
Mobile-first viewport and an early UTF-8 charset declaration.
og:title, description, image, url, and type for rich social sharing.
summary_large_image cards with title, description, and image.
Exactly one H1, no skipped levels, semantic structure.
Descriptive alt text and explicit width/height to protect CLS.
Descriptive anchors, rel="noopener", and crawlable navigation.
Crawlability, sitemap reference, and valid XML.
Self-referencing, absolute, HTTPS canonicals that match og:url.
Schema.org JSON-LD (Article, FAQ, Breadcrumb, Organization…).
Add the marketplace and the seo-optimizer plugin to Claude Code.
Run /seo-audit on a file, a directory, or your framework’s layout. You get a scored report with critical, error, and warning findings.
Apply precise fixes with /seo-optimize (or conservative micro-edits with /seo-reviewer), or ask the SEO Expert skill.
| Claude SEO Checker | Lighthouse | Ahrefs / Semrush | |
|---|---|---|---|
| Audits your source code | Yes | No (rendered page) | No (crawls live site) |
| Fixes issues for you | Yes | No | No |
| Works before you deploy | Yes | No | No |
| Free, no signup | Yes | Yes | No |
| Framework-aware | Yes | Partial | No |
It is a free, AI-powered SEO audit tool that runs inside Claude Code. You install the seo-optimizer plugin and run /seo-audit to scan any HTML file, React, Next.js, or Vue app, or static site for the technical SEO issues that hurt rankings — then fix them with /seo-optimize.
Yes. The seo-optimizer plugin is free and open source (MIT). There is no signup, subscription, or hosted dashboard — it runs locally in Claude Code on your own machine.
Title tags and meta descriptions, viewport and charset, Open Graph and Twitter Card tags, heading hierarchy, image alt text, internal and external links, robots.txt and sitemap.xml, canonical URLs, and Schema.org structured data — scored 0–100 and prioritized by impact.
Traditional tools crawl your live, rendered site and hand you a report to act on. The Claude SEO Checker reads your source code (framework layouts, components, templates), catches issues before you deploy, and can apply the fixes for you with /seo-optimize instead of just flagging them.
Yes. It is framework-aware and detects React (Create React App, Next.js), Vue (Nuxt), Angular, Svelte (SvelteKit), static site generators (Gatsby, Eleventy, Hugo, Astro), WordPress themes, and plain HTML.
Yes. After the audit, /seo-optimize applies precise, minimal edits (and /seo-reviewer applies conservative micro-edits under a 5% change limit), so you get fixes as a diff you can review — not a to-do list.
No. Because it runs on your source files, you can audit and fix SEO in a feature branch before anything ships — no live URL or deployment required.