CrawlObserver vs WebCrawler Pro
CrawlObserver
crawlobserver.comWebCrawler Pro
webcrawler.proSide by side
| Figure | CrawlObserver | WebCrawler Pro |
|---|---|---|
| Price from | Free | $1/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | — |
| Self-hosted | — | Yes |
| Plans published | 1 | 7 |
| Spec score · SEO Crawler Software | 8.6 (#5) | 8.6 (#6) |
| Spec score · SEO tools | 8.0 (#103) | 8.9 (#16) |
| Data storage | Crawl results are stored in ClickHouse, described as a columnar database. | Scan data is stored as JSON files, while accounts and sessions use SQLite; signed-in scans are private and anonymous scans are reachable through their unique URLs. |
| Free plan | Yes | Yes |
| Integrations | The page lists Google Search Console, Claude Code, and SEObserver under “Integrates with.” | The FAQ names Google sign-in and support for user-provided OpenAI, Gemini, and Anthropic API keys; it says the user’s own key stays on their device. |
| Intended users | The page presents use cases for technical SEO audits, monthly tracking, internal linking analysis, broken-link detection, and client reporting. | The maker describes the tool as an independent site crawler and says agencies can send its client-ready reports to clients. |
| Technical SEO | It tracks redirect chains, internal PageRank, duplicate pages using SimHash, and optionally renders JavaScript. | The audit checks titles, meta descriptions, H1s, canonicals, Open Graph, response times, page size, duplicates, orphan pages, and thin content. |
Plans
WebCrawler Pro
- Free guestFree
- Free signed inFree
- Paid tokens$1 a month
- Free daily allowanceFree
- GuestFree
- Signed-inFree
- Prepaid crawl tokens$11,000, paid once
In their own words
CrawlObserver
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.
WebCrawler Pro
WebCrawler Pro crawls websites and scores pages for technical SEO, answer-engine readiness (AEO) and generative engine optimization (GEO). Technical checks include titles, meta descriptions, H1s, canonicals, Open Graph tags, response times, page size, duplicate content, orphan pages and thin content. AEO checks include FAQ schema and question-based headings; GEO checks cover author attribution, freshness, factual density, authority links and original-research signals. Reports include crawl-depth charts, score distributions, response-time histograms, page breakdowns and site summaries, with PDF, CSV and JSON exports. Signed-in users can draft titles, FAQs, JSON-LD, alt text, internal links and llms.txt using a hosted model or their own API key. HTML mode fetches server responses; DOM Render executes JavaScript before extracting content. Guests receive 50 requests/day and signed-in users 100 requests/day. Paid tokens are listed at $1 a month. It supports Linux, macOS, Windows, web and self-hosting. Pages behind login walls, blocked by robots.txt or protected by advanced bot detection may not be fully crawlable.