A Full-Featured SEO Crawler. Zero Cost.

ScreamingCAT gives you the same depth of analysis as premium crawlers — broken links, metadata audits, structured data validation, JavaScript rendering, and Google tool integrations — without a license fee.

🚀 Launching April/May 2026

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Fast, Configurable, Multi-Threaded Crawling

ScreamingCAT’s Rust-powered engine crawls websites concurrently with fine-grained control over every aspect of the crawl.

  • Multi-threaded crawling — configurable thread count (default: 8 threads)
  • Crawl depth and URL limits — set maximum depth, folder limits, and query string handling
  • Request throttling — control max URLs per second to avoid overloading servers
  • Redirect chain tracking — follow redirects and detect infinite loops
  • Content deduplication — MD5 hashing flags identical pages automatically
  • URL filtering — include/exclude patterns using regular expressions
  • User-Agent presets — crawl as Googlebot (desktop or mobile), Bingbot, or any custom agent
  • Custom HTTP headers — add authentication tokens or custom headers to every request
  • Robots.txt handling — respect, ignore, or respect-and-report modes
  • Sitemap discovery — parse XML sitemaps to find URLs beyond internal links

60+ Automated SEO Checks per URL

Every crawled page is analyzed across dozens of data points. Issues are categorized by type and severity, so you fix what matters first.

Response & Server

  • HTTP status codes (2xx, 3xx, 4xx, 5xx)
  • Response time tracking
  • Content type and page size
  • Redirect chains and destinations

Metadata & Content

  • Page titles — missing, too short, too long, duplicates
  • Meta descriptions — missing, too short, too long, duplicates
  • H1 and H2 tags — missing, duplicate, multiple
  • Word count and text-to-HTML ratio
  • Meta robots directives (noindex, nofollow)
  • Canonical tag validation

Links

  • Internal and external link counts
  • Broken link detection (4xx, 5xx responses)
  • Orphan page identification
  • Generic anchor text detection
  • Crawl depth analysis

Images & Structured Data

  • Missing alt text detection
  • Image crawling and resource analysis
  • JSON-LD extraction and validation
  • Missing structured data warnings
  • Schema validation errors

International & Social

  • Hreflang tag extraction and validation
  • Open Graph and Twitter Card detection
  • Missing social metadata warnings

Spot Security Issues That Affect SEO

Search engines factor security signals into rankings. ScreamingCAT flags common security gaps.

  • HTTPS usage — detect HTTP pages and mixed content
  • HSTS headers — missing Strict-Transport-Security
  • Content Security Policy — missing CSP headers
  • X-Frame-Options — clickjacking protection check
  • X-Content-Type-Options — MIME sniffing protection
  • Insecure forms — HTTP form actions on HTTPS pages

See Your Pages the Way Google Sees Them

Many modern websites rely on JavaScript to load content. ScreamingCAT’s built-in headless Chrome engine renders pages fully before analysis.

  • Detect AJAX-loaded content invisible to text-only crawlers
  • Analyze single-page applications (SPAs) and React/Vue/Angular sites
  • Compare rendered vs. raw HTML output
  • Toggle between text-only and JavaScript rendering modes

Enrich Crawl Data with Google’s Own Metrics

Connect your Google accounts to pull real performance and search data directly into your crawl results. No third-party plugins.

PageSpeed Insights

  • Lighthouse scores per URL
  • Core Web Vitals: LCP, FCP, CLS, TTI, Speed Index
  • Mobile and desktop strategies

Google Search Console

  • Clicks, impressions, CTR, and average position per URL
  • See which crawled pages actually drive organic traffic

Google Analytics 4

  • Sessions, users, bounce rate, and conversions per page
  • Connect crawl data to real user behavior

All integrations use OAuth 2.0 with automatic token refresh.

Extract Any Data from Any Page

Go beyond built-in metrics. Define custom extraction rules to pull specific data from crawled pages.

  • CSS selectors — target any HTML element
  • XPath expressions — precise path-based extraction
  • Regex patterns — match and capture text patterns
  • Custom search — find specific text or patterns across all crawled pages (contains or regex mode)

Results appear per URL in the main results table — exportable like any other column.

Understand Your Site Structure at a Glance

Three built-in visualization tools turn raw crawl data into actionable insight.

Crawl Tree

Visual hierarchy showing your site’s folder and page structure. Spot deep or orphaned sections.

Site Graph

Network diagram of internal linking relationships. See how pages connect — and where link equity flows.

Crawl Depth Chart

Distribution of URLs by depth level. Identify pages buried too deep for search engines to find.

All visualizations support color-coding by indexability, status code, or content type. Node sizing by crawl depth, internal links, or word count. Multiple layout options and right-click context menu for quick URL navigation.

Get Your Data Out in Any Format

  • CSV — full crawl data with all metrics
  • Excel (XLSX) — formatted spreadsheets ready for client reporting
  • XML Sitemap — generate valid sitemaps from your crawl results
  • Project Files (.sccat) — save entire crawls with integration data to revisit later

Track SEO Changes Over Time

Save crawl snapshots with custom names. Compare any two snapshots to detect:

  • Added URLs — new pages since last crawl
  • Removed URLs — pages that disappeared
  • Changed fields — title, status code, description, canonical, and more

Use comparisons after site migrations, redesigns, or routine audits to verify nothing was broken.

Every Feature. No Paywall.

ScreamingCAT gives you the complete toolset for technical SEO — free, open-source, and built to perform.

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Windows, macOS, Linux