Image: GitHub
Why it mattersAn SEO agency or in-house team can run a full audit from inside Claude Code. The output is a prioritized action plan and reports the team keeps as files.
An SEO team that pays an agency for a quarterly audit has a new option. A free tool runs the same checks in 10 to 15 minutes. Claude SEO is an open-source plugin for Claude Code, written by Daniel Agrici. The GitHub repository had 20,488 stars by 25 October. It ranked 25th on Trendshift's daily list on 25 October.
The plugin is 26 sub-skills and 19 specialist agents. The project says up to 17 agents work on a site at the same time. One command, /seo audit <url>, runs a full site audit and writes a prioritized action plan. The repository is MIT licensed. The project was created on 7 February 2026.
What one audit covers
The project lists seven areas of checks. Technical SEO looks at crawlability, indexing, sitemaps, robots.txt, redirects, page speed and Core Web Vitals. Content quality checks E-E-A-T, thin pages and topic coverage. The structured-data agent finds, validates and writes Schema.org markup. The GEO agent scores how likely Google AI Overviews, AI Mode, ChatGPT, Perplexity and Gemini are to cite a page. There are agents for local SEO, e-commerce and international SEO. Backlinks come through free sources: Moz, Bing Webmaster Tools and Common Crawl.
The agents write reports as Markdown, PDF and JSON files that stay on the user's own machine. The project says every recommendation says what it is based on and how to tell if a fix worked.
What a buyer pays for today
The README has a comparison table. It lists an SEO agency audit at $2,000 to $15,000 for one project. It lists SEO audit software at $99 to $999 a month. Claude SEO lists its own cost as "free, with your Claude Code plan". The project calls these numbers "typical market prices, for illustration".
The project points at its own site, claude-seo.md, as a live example. The README says the site had 10,800 Google Search Console clicks and 324,000 impressions. The window was 23 March to 12 June 2026. The project says the site was audited with Claude SEO from day one. Treat each of these figures as the project's own: there is no independent audit of them in the README.
What it costs to adopt
Claude Code 1.0.33 or newer is required, and Python 3.11 to 3.14. A /seo setup command builds an isolated Python environment and a headless browser without touching the rest of the system. The project says the plugin runs locally, so a client's data stays on the SEO team's machine.
The README is honest about a limit. Without Google API keys, Core Web Vitals are lab-based estimates. Pages that load content after a scroll or a click "can give noisy results". A /seo google command adds live Search Console, PageSpeed and CrUX data if the team has the keys.
For a working SEO team, the test is one evening on a real client site. If the plan matches the one a human consultant would write, the free tool replaces the paid audit. If the plan misses a fault the human sees, the paid audit still has a job.
Source
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