LibreCrawl is unclaimed —

LibreCrawl

A powerful, free SEO crawler with features that surpass even paid Screaming Frog.·librecrawl.com

LibreCrawl is a free, open-source SEO crawler that performs comprehensive technical SEO audits, including meta tag, schema markup, hreflang, and PageSpeed analysis. It supports full JavaScript rendering via Playwright for crawling modern SPAs (React, Vue, Angular, Next.js), and uses real-time memory profiling and virtual scrolling to crawl over 1 million URLs without crashing. It is self-hostable, MIT-licensed, and offers unlimited CSV, JSON, and XML exports with no paywalls.

What it's for

Comprehensive technical SEO auditsDetecting broken links and 404 errorsIdentifying duplicate contentMeta tag and title tag optimization checksDetecting redirect chains and loopsValidating schema markup for rich snippetsAuditing hreflang implementation for multi-language sitesCanonical tag analysisValidating robots.txt and XML sitemapsMonitoring page speed and Core Web VitalsAnalyzing internal linking structureFinding missing alt text and oversized imagesChecking mobile usabilityIdentifying mixed content and SSL issuesCrawling JavaScript-rendered single page applicationsAuditing large e-commerce catalogs and product pagesFinding orphaned articles and thin content on publisher sites

Features 18

Broken link and 404 detection
Canonical tag analysis
Comprehensive SEO audits (meta tags, schema markup, hreflang, social tags, PageSpeed metrics)
Crawls modern SPAs built with React, Vue, Angular, Next.js
Custom CSS injection
Detailed link tracking
Duplicate content detection
Full JavaScript rendering via Playwright (headless and headed modes)
HTTPS and mixed-content security checks
Issue filtering and exclusion
Mobile usability checks
Multi-session support for multiple projects
Real-time memory profiling dashboard
Redirect chain and loop detection
REST API for programmatic crawl control
Robots.txt and XML sitemap validation
Unlimited exports in CSV, JSON, or XML with custom field selection
Virtual scrolling for handling 1M+ URLs

At a glance

free tieropen sourceself-hostableAPI

TypeWeb app

DeploymentSelf-hosted

PlatformsWeb, Windows, macOS, Linux

ForSEO agencies, enterprise SEO teams, e-commerce sites, content publishers and media sites, SaaS and tech companies, freelance SEO consultants, developers

CompanyPhialsBasement

Resources

Docs

Pricing

The product is stated to be 100% free forever, with no paid tiers, subscription fees, or artificial limitations.

FreeFree

LibreCrawl is entirely free and open source; the vendor states there will never be paid tiers or subscription fees.

No URL limits, no export limits, no paywalls