Codex Seo

Codex SEO is an open-source tool that performs comprehensive SEO audits inside the OpenAI Codex CLI.

Codex SEO evaluates websites through technical checks, content quality assessments, structured data validation, and AI search optimization. It runs inside the OpenAI Codex CLI using 26 sub-skills and 17 expert roles, analyzing sites for issues like crawlability, E-E-A-T, and Core Web Vitals. The tool generates prioritized action plans saved as Markdown files locally on your computer. It requires OpenAI Codex CLI and Python 3.11 to 3.14, utilizing a headless browser for JavaScript-heavy pages. Optional integrations connect to Google APIs, Bing, and other services using your own keys.

Codex Seo at a glance

Best for: Software engineer
Runs on: CLI, open source
Pricing: Free, open-source under the MIT license
Released: October 2026
Category: AI coding tool
Website: github.com/zhtyyx/codex-seo

Key features

Run full site SEO audits and single page analyses
Check technical SEO including sitemaps and Core Web Vitals
Analyze content quality and E-E-A-T factors
Detect and generate Schema.org structured data
Evaluate readiness for AI search and generative engines
Monitor SEO drift with SQLite snapshots
Generate strategic plans by industry type

Use it for

Conducting full technical and content SEO audits
Optimizing websites for AI search engines and agents
Generating and validating XML sitemaps and schema markup
Analyzing multi-language sites and hreflang tags

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