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CrawlObserver

crawlobserver.com

Free plan WebAPI
Visit crawlobserver.com
Spec score 8.6 #5 of 34 in SEO Crawler Software

What it is

CrawlObserver is a free private-beta SEO crawler available through web and API access. It reports more than 45 signals per page and describes audits without a page ceiling, including sites with 500K+ pages. Crawl comparisons identify added or removed URLs and changes to redirects, titles, and canonicals. Technical checks include redirect chains, internal PageRank, SimHash duplicate detection, and broken internal or external links. Internal authority-flow views help surface orphan pages, linking opportunities, and pages receiving too many links. JavaScript rendering can be off, automatic, or always enabled, with automatic detection for React, Vue, Next.js, and Nuxt. A REST API launches crawls and retrieves results. CrawlObserver says it follows robots.txt and crawl-delay, applies per-host delays, and blocks private IP ranges with post-DNS validation. Results are stored in ClickHouse.

Spec sheet

Product
CrawlObserver is a lightweight SEO crawler with 45+ signals per page, cross-crawl comparison, and API control.Read 12 Oct 2026 · crawlobserver.com
Intended users
The page presents use cases for technical SEO audits, monthly tracking, internal linking analysis, broken-link detection, and client reporting.Read 12 Oct 2026 · crawlobserver.com
Audience
The stated use cases include technical SEO audits, monthly tracking, client reporting, internal-link analysis, and site-owner migration checks.Read 12 Oct 2026 · crawlobserver.com
Free plan
YesRead 23 Sep 2026 · crawlobserver.com
API
The product offers a REST API to launch crawls, fetch results, and integrate audits into workflows.Read 12 Oct 2026 · crawlobserver.com
Integrations
The page lists Google Search Console, Claude Code, and SEObserver under “Integrates with.”Read 12 Oct 2026 · crawlobserver.com
Security
The crawler describes built-in SSRF protection using post-DNS IP validation to block private IP ranges.Read 12 Oct 2026 · crawlobserver.com
API access
YesRead 23 Sep 2026 · crawlobserver.com
Audits
The site says audits have no page ceiling and can be used on sites with 500K+ pages.Read 12 Oct 2026 · crawlobserver.com
Authority data
Connecting a SEObserver account enables crawl cross-referencing with Majestic metrics including TrustFlow, CitationFlow, backlinks, referring domains, and Topical TrustFlow.Read 12 Oct 2026 · crawlobserver.com
Availability
The site invites users to join a free private beta; it does not state a public release date or pricing plan on the page.Read 12 Oct 2026 · crawlobserver.com
Backlink analysis
YesRead 23 Sep 2026 · crawlobserver.com
Broken links
It detects broken internal and external links, expired domains, and hotlinks to third-party resources.Read 12 Oct 2026 · crawlobserver.com
Comparison
It compares crawls to show added or removed URLs and changes to redirects, titles, and canonicals.Read 12 Oct 2026 · crawlobserver.com
Crawl comparison
It compares crawls to show added or removed URLs and changes to redirects, titles, or canonicals.Read 12 Oct 2026 · crawlobserver.com
Crawl limits
The site describes audits as unlimited, with no page ceiling, including for sites with 500K+ pages.Read 12 Oct 2026 · crawlobserver.com
Data ownership
The site describes CrawlObserver as open source and says users' data belongs to them.Read 12 Oct 2026 · crawlobserver.com
Data storage
Crawl results are stored in ClickHouse, described as a columnar database.Read 12 Oct 2026 · crawlobserver.com
Internal links
It visualizes internal authority flow and helps identify orphan pages, linking opportunities, and pages concentrating too many links.Read 12 Oct 2026 · crawlobserver.com
JavaScript rendering
Rendering can be turned off, set to automatic, or always enabled; automatic mode detects frameworks including React, Vue, Next.js, and Nuxt.Read 12 Oct 2026 · crawlobserver.com
Keyword research
NoRead 23 Sep 2026 · crawlobserver.com
Performance
The site reports about 170 MB of memory per crawl, real-time results, and 10+ concurrent crawls.Read 12 Oct 2026 · crawlobserver.com
Rank tracking
NoRead 23 Sep 2026 · crawlobserver.com
Rendering
JavaScript rendering can be set to off, automatic, or always; automatic mode detects frameworks including React, Vue, Next.js, and Nuxt.Read 12 Oct 2026 · crawlobserver.com
REST API
The full REST API can launch crawls and retrieve results for workflow automation.Read 12 Oct 2026 · crawlobserver.com
Robots and crawl behavior
It says it respects robots.txt and crawl-delay, and supports configurable per-host politeness delays.Read 12 Oct 2026 · crawlobserver.com
Site audit
YesRead 23 Sep 2026 · crawlobserver.com
Storage
Crawl results are stored in ClickHouse, which the site describes as a columnar database.Read 12 Oct 2026 · crawlobserver.com
Technical features
Listed features include robots.txt and crawl-delay compliance, redirect-chain tracking, internal PageRank, SimHash duplicate detection, and optional JavaScript rendering.Read 12 Oct 2026 · crawlobserver.com
Technical SEO
It tracks redirect chains, internal PageRank, duplicate pages using SimHash, and optionally renders JavaScript.Read 12 Oct 2026 · crawlobserver.com

Plans and prices

Free private beta Free Private beta access; no page ceiling stated Read 12 Oct 2026 · crawlobserver.com

Every CrawlObserver plan and price →

Strong points and limits

Strong points

  • Reports 45+ signals per page
  • No stated page ceiling, including 500K+ sites
  • Compares crawl changes across URLs and metadata
  • Offers REST API crawl control and results
  • Includes configurable JavaScript rendering modes

Limits

  • Access is described as a free private beta
  • No public release date is stated
  • SEObserver connection is needed for Majestic metrics

Who it suits

CrawlObserver is aimed at teams handling technical SEO audits, recurring tracking, internal-link analysis, migration checks, broken-link work, or client reporting. Its API and web access suit workflow automation as well as browser-based audits.

Verdict

CrawlObserver combines broad technical crawling, comparisons, internal-link analysis, and API automation in a private-beta service. Buyers should account for beta availability and the separate SEObserver requirement for Majestic cross-referencing.

Where Specifiction places it

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