Transparent, self-hostable tools and repositories.
Read the comparison guide →Browse the full catalog here. For a task-based choice, start with our measured SiteOne, lychee and sitemap-auditor results. Read the test and download the sample →
Planning the audit itself? Follow the open-source audit workflow. For recently listed tools, review the dated discovery notes.
Open-source SEO platform for humans and AI agents
Keyword research, rank tracking, backlinks, technical audits and AI visibility in one self-hostable workspace. Includes an MCP endpoint and reusable agent skills. Its documented capabilities include Keyword and competitor research, Technical SEO audits and AI visibility tracking.
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.
Open-source Search Console for AI visibility
Monitor which AI engines cite your brand, the prompts you win and where competitors are gaining visibility. Its documented capabilities include AI citation monitoring, Prompt tracking and Competitor gaps. It is most relevant to workflows involving GEO and AI Visibility.
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.
LLM-first SEO analysis with specialist sub-skills and scripts
An open-source SEO capability pack for coding agents with specialized workflows, evidence-collection scripts and focused agents covering technical, content and AI-search audits. Its documented capabilities include Specialized SEO sub-skills, Evidence collection scripts and Technical audits.
Open-source marketing skills spanning SEO, content and analytics
A collection of reusable marketing skills for agentic workflows across SEO, content, email, advertising, analytics and growth with support for multiple coding agents. Its documented capabilities include SEO skills, Content workflows and Analytics routines.
Automated audits for performance, SEO and web quality
Google Lighthouse audits web pages across performance, accessibility, best practices and search discoverability. It runs from Chrome DevTools, the command line or Node.js, supports custom configurations and produces detailed HTML, JSON or CSV reports for debugging and continuous integration.
A high-capacity desktop crawler for detailed SEO audits
FreeCrawl is a cross-platform desktop and command-line crawler built for large technical audits. It combines more than 150 checks with JavaScript rendering, duplicate analysis, link graphs, log analysis, Google data integrations, many export formats and an MCP server that can control live crawls.
Find broken links across documents and complete websites
LinkChecker recursively validates links across websites and local documents with multithreaded crawling and robots.txt support. It handles HTTP, HTTPS, FTP, mail and local files, supports authenticated sites and proxies, and exports results as text, HTML, SQL, CSV, XML or sitemap graphs.
Fast link validation for websites, files and CI pipelines
Lychee is an asynchronous Rust link checker that scans live websites as well as Markdown, HTML, reStructuredText and plain files. It ships as a static binary, library, Docker image and GitHub Action with parallel checking, configurable output and broad platform support.
Create clean, structured web data for AI applications
Crawl4AI is an open-source crawler and scraper optimized for LLM, RAG and agent pipelines. It supports browser-based crawling, structured extraction, Markdown generation, dynamic content, proxy and session control, Docker deployment and scalable asynchronous workflows.
Add low-bandwidth static search to large websites
Pagefind builds a complete search index after a static site is generated and serves results without a hosted search backend. Its segmented index, multilingual support, filters, custom ranking and ready-made interface make fast on-site search practical even for large documentation and content sites.
Build fast full-text, semantic and hybrid search experiences
Meilisearch is a developer-focused search engine with search-as-you-type, typo tolerance, filters, facets, geosearch and extensive language support. It also supports vector and hybrid retrieval, conversational search, personalization and MCP integration for modern AI-powered discovery systems.
Run fast typo-tolerant search with simple operational tooling
Typesense is an open-source search engine for instant, faceted and geographically aware discovery experiences. It combines tunable text ranking with vector, semantic, hybrid, natural-language and conversational search while shipping as a single binary with straightforward APIs and client libraries.
Audit sitemap coverage and compare exact URL cohorts between releases.
A dependency-free Node.js CLI for checking sitemap declarations, image coverage, metadata quality and deterministic URL cohort changes between releases. It works locally without an account or API key. Sitemap Cohort Auditor audits sitemap declarations; it does not crawl every listed page or predict indexing, rankings or traffic. Maintained by Edilec under the MIT License.