Open-source SEO tools you can run yourself, read every line of, and hand to your AI agent
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Stage
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Founded
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Based in
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Pricing model
Open source
Free
Pricing
Hosted app: free, all features unlimited. Self-hosted: free, open source under MIT licence. Search data from YepAPI: paid per lookup. Examples: keyword overview $0.47–$0.57, keyword ideas $0.07–$0.25, SERP checker $0.25–$0.26, rank check $0.02–$0.10, backlink checker $0.30–$0.34. New YepAPI accounts
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Key features
Keyword research with difficulty, volume and top 10 results
SERP checker for any location with desktop and mobile options
Rank tracking to top 20, 50 or 100 by country, city or coordinates
Backlink checker with monthly link history
AI visibility tracking across 120+ AI models with web search
Local rank checker with geo-grid maps
MCP server with 76 tools for AI agents
Google Search Console integration
Self-hosting with Docker on your own server
100+ automated checks across 8 categories
Mobile and desktop Lighthouse audits
Security header analysis including CSP, HSTS, X-Frame
SSL certificate chain and expiry monitoring
Core Web Vitals measurement
Technology stack detection
Accessibility audit with screenshot contrast analysis
PDF, JSON, and Markdown export
Permanent public report URLs
Free tools including DNS lookup, SSL checker, and redirect tracer
What makes it different
MIT licensed open-source code you can read and modify completely
Self-hosted option keeps all your data on your own server
Pay per lookup with spending limits controlled by you
AI agents have spending ceilings to prevent overspending
Truly free with no account, credit card, or subscription required
Comprehensive 8-category scoring system in addition to Lighthouse
Globally distributed workers to test from multiple regions
Permanent public URLs allow reports to be shared and compared over time
OpenSEO
BeaverCheck