Best open-source SEO tools
for builders.

Open-source SERP API for SEO and AI automation

A normalized API and CLI for live results from multiple search engines, including answer boxes, related searches and AI summaries. Its documented capabilities include Multiple search engines, Normalized JSON API and SERP feature extraction.

One skill and 50+ audit tools for AI agents

A developer-focused SEO audit toolkit that helps coding agents find, explain and fix organic and AI search visibility issues. Its documented capabilities include 50+ audit utilities, Typed crawler and Actionable reports. It is most relevant to workflows involving Agent Skills and SEO Audit.

Official MCP access to professional SEO data

The official DataForSEO MCP server exposes SERPs, keywords, backlinks, on-page audits and AI optimization data to compatible agents through a maintained TypeScript implementation. Its documented capabilities include SERP endpoints, Keyword data and Backlink analysis.

Simple, self-hosted technical SEO auditing

A mature open-source crawler that discovers broken links, redirect problems, metadata issues and structural SEO errors. Its documented capabilities include Full-site crawler, Issue severity scoring and Redirect analysis. It is most relevant to workflows involving Technical SEO and Crawler.

Open-source rank tracking with unlimited keywords

Track Google positions across domains with Search Console data, email notifications and a built-in reporting API. Its documented capabilities include Unlimited keyword tracking, GSC integration and Notifications. It is most relevant to workflows involving Rank Tracking and Search Console.

Run Lighthouse performance scans across an entire site

Unlighthouse combines site crawling with Lighthouse to scan many pages, visualize performance and accessibility results, and run locally or in continuous integration. Its documented capabilities include Site-wide Lighthouse scans, Performance dashboards and Route discovery.

Cross-platform audits for SEO, security and accessibility

SiteOne Crawler analyzes websites for technical SEO, security, accessibility and performance issues through a cross-platform CLI and desktop-friendly reporting workflow. Its documented capabilities include SEO and link audits, Security checks and Accessibility analysis.

Bring live Ahrefs SEO data into AI agents

The official hosted Ahrefs MCP server gives supported AI tools secure access to keyword, backlink and competitor data through account-scoped authorization and usage controls. Its documented capabilities include Hosted remote MCP, Ahrefs API access and OAuth-style authorization.

Connect Semrush SEO and traffic data to AI workflows

The official Semrush MCP server exposes SEO, traffic, backlinks and read-only project data to supported AI tools for research, reporting and monitoring workflows. Its documented capabilities include SEO API data, Traffic and market insights and Read-only project data.

Search, crawl and extract clean web data from AI agents

The official Firecrawl MCP server adds live search, scraping, crawling, mapping and structured extraction tools to MCP-compatible agents with cloud and self-hosted options. Its documented capabilities include Web search, Page scraping and Site crawling.

Give agents access to thousands of web automation actors

Apify MCP connects AI agents to hosted and local web scrapers for search engines, maps, social platforms, e-commerce and other structured data collection tasks. Its documented capabilities include Hosted MCP endpoint, Thousands of Apify Actors and OAuth support.

Real-time search, extraction, mapping and crawling

The official Tavily MCP server brings agent-oriented web search, page extraction, site mapping and crawling to local or remote MCP clients. Its documented capabilities include Real-time search, Page extraction and Site mapping. It is most relevant to workflows involving MCP and Web Search.