CrawlObserver vs SpiderNow
CrawlObserver
crawlobserver.comSpiderNow
spidernow.comSide by side
| Figure | CrawlObserver | SpiderNow |
|---|---|---|
| Price from | Free | $6.99/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 1 | 4 |
| Spec score · SEO Crawler Software | 8.6 (#5) | 8.5 (#9) |
| Spec score · SEO tools | 8.0 (#103) | 8.6 (#27) |
| API | The product offers a REST API to launch crawls, fetch results, and integrate audits into workflows. | The FAQ says API services are being built and will be available shortly. |
| API access | Yes | Yes |
| Audience | The stated use cases include technical SEO audits, monthly tracking, client reporting, internal-link analysis, and site-owner migration checks. | The product is described as a fit for SEO agencies, web developers, digital marketers, and businesses. |
| Backlink analysis | Yes | No |
| Free plan | Yes | Yes |
| Integrations | The page lists Google Search Console, Claude Code, and SEObserver under “Integrates with.” | The content improvement feature uses Grammarly for spelling and grammar corrections. |
| Keyword research | No | No |
| Product | CrawlObserver is a lightweight SEO crawler with 45+ signals per page, cross-crawl comparison, and API control. | SpiderNow is a website crawler that extracts website data and performs real-time site audits. |
| Rank tracking | No | No |
| Security | The crawler describes built-in SSRF protection using post-DNS IP validation to block private IP ranges. | The FAQ says user accounts and data are protected with SSL encryption and website payments are secured through Stripe. |
| Site audit | Yes | Yes |
Plans
SpiderNow
- FreeFree
- Basic$6.99 a month
- Standard$19.99 a month
- Advanced$39.99 a month
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.
SpiderNow
SpiderNow is a website crawler that extracts site data and performs real-time audits. Users can scan a page, folder, or full website. Its checks cover broken links and images, JavaScript sites, redirects, duplicate content, internal and external links, and robots directives. PageSpeed Insights analysis includes Performance, Accessibility, Best Practices, and SEO audits for pages.
The product also has tools to minify and beautify HTML, JavaScript, and CSS, generate critical CSS, and convert images to WebP. AI-powered tools can recommend or implement content changes subject to the site's add-on terms; content improvement uses Grammarly for spelling and grammar corrections. SpiderNow is described as suitable for SEO agencies, web developers, digital marketers, and businesses. It is available on web, Android, iOS, and as an extension, and requires no software download. Crawl size depends on device RAM because processing uses device memory. The free plan includes 10 single-page scans per month, 5 scan details and issue views, and 5 page metric scores. Paid plans start at $6.99 a month.