CrawlZilla

CrawlZilla is a cloud-based SEO crawler for technical site analysis, available on the web and through an API. Its Spider, List, and Subdomain modes crawl HTML, images, JavaScript, CSS, and PDFs. Each URL can include more than 40 data points, such as titles, canonicals, hreflang, schema, and Open Graph information. An internal-link graph helps surface orphan pages and show PageRank flow, while headless Chrome renders JavaScript pages. Lighthouse audits report Performance, Accessibility, Best Practices, and SEO scores, as well as Core Web Vitals. Page Monitor checks selected URLs on a schedule, detects changes across 12 or more SEO fields, and can send email alerts. The REST API uses HTTPS, returns JSON, and authenticates with bearer tokens. The free plan costs nothing and allows 10,000 URLs per session, 10 requests per second, three Lighthouse audits per crawl, and 20 monitored URLs. Premium is listed at £39.99 a month. The maker says its distributed cloud infrastructure supports crawls of 100 million or more URLs, with no installation or server management required.

CrawlZilla brings crawling, technical SEO data, Lighthouse audits, and page monitoring together in a cloud service. The free tier has defined crawl and monitoring limits; Premium is listed at £39.99 a month.

CrawlZilla suits SEO professionals who need to crawl websites, inspect technical page data, monitor changes, or use an API. Its different crawl modes and audit tools may also suit teams working with JavaScript-heavy sites.

CrawlZilla is a cloud-based technical SEO crawler that combines site audits with link analysis, Lighthouse checks and page monitoring. It is best suited to teams that need a web service and API for substantial crawl workloads. Its broad toolset is appealing, but the free and paid tiers impose clear quotas, and several larger plans have custom pricing.

Overview

CrawlZilla brings crawling, URL-level SEO analysis, internal-link mapping, performance audits and scheduled monitoring into one service. Its distributed infrastructure is designed to support crawls of 100 million or more URLs, but the general crawl limit is 100,000 pages per crawl; the Enterprise plan is the one that specifies 100M+ URLs. That distinction matters for large-site buyers: the headline capacity does not mean every plan supports it.

There is no software installation or server management to handle, which makes the service practical for teams that want cloud-based operations. In return, users must work within plan quotas and request rates. The combination is less compelling for buyers who need predictable published pricing at every tier or named third-party integrations.

Key features

Crawling and SEO data

Spider, List and Subdomain modes suit whole-site discovery, targeted URL sets and subdomain-focused work. CrawlZilla processes HTML, images, JavaScript, CSS and PDFs, so audits can cover more than standard web pages. Each URL can return over 40 data points, including titles, canonicals, hreflang, schema and Open Graph information. This breadth helps technical teams investigate several common SEO signals in one crawl, though the plan's URL and request limits still determine how much work fits into a session.

Links, rendering and audits

The inlink graph can expose orphan pages and show PageRank flow, giving teams a way to examine internal structure alongside page-level signals. Headless Chrome rendering allows JavaScript pages to be crawled. Lighthouse audits report Performance, Accessibility, Best Practices and SEO scores, plus Core Web Vitals; the number of audits per crawl varies by tier, so smaller plans are less suitable for broad performance reviews.

Monitoring and API

Page Monitor checks selected URLs on a schedule, detects changes in 12 or more SEO fields and can send email alerts. Its usefulness depends on the monitored-URL allowance, which ranges from 20 on Free to 1,000 on Ultimate, with custom limits on Enterprise. The REST API uses HTTPS, returns JSON and authenticates with bearer tokens. CrawlZilla says tokens are stored as SHA-256 hashes and advises keeping them out of source control and client-side code. Enterprise lists custom API integrations, but the pricing page names no third-party integrations.

Pricing

CrawlZilla is freemium. Free costs nothing, billed £0/mo, and allows 10,000 URLs per session, 10 requests per second, three Lighthouse audits per crawl and 20 monitored URLs. It is a meaningful starting point for smaller audits and basic monitoring, but the monitoring and audit caps constrain repeated or broad coverage.

Lite has custom pricing and raises the allowance to 100,000 URLs per session, while keeping the rate at 10 requests per second; it includes five Lighthouse audits per crawl and 100 monitored URLs. It suits users who have outgrown Free but do not need Premium's stated request rate or larger quotas. Premium costs £39.99 a month, billed £39.99/mo, and increases the limits to 1,000,000 URLs per session, 20 requests per second, 10 Lighthouse audits per crawl and 500 monitored URLs. It is the clearest paid step for teams with recurring, larger audits that can use those increases.

Ultimate has custom pricing and allows 10,000,000 URLs per session, 50 requests per second, 25 Lighthouse audits per crawl and 1,000 monitored URLs. Enterprise also has custom pricing; it specifies 100M+ URLs, unlimited Lighthouse audits per crawl and custom Page Monitor limits. Those tiers target substantially larger deployments, but buyers need a quote rather than a published monthly price. Scheduled crawls and structured data auditing are supported; the listed tier limits should guide how much work a team expects to run.

Platforms

CrawlZilla is available on web and through an API. The API's HTTPS and JSON interface makes it suitable for automation, while cloud delivery avoids local installation and server administration.

Who it's for

CrawlZilla is a strong fit for SEO teams and agencies that want crawling, internal-link analysis, JavaScript rendering, Lighthouse results and ongoing monitoring in one cloud service. Larger organisations can consider Ultimate or Enterprise when their workload exceeds Premium's quotas, though the custom pricing makes budgeting less direct. Smaller site owners may find Free sufficient for limited audits, but should look elsewhere if they need more than 20 monitored URLs without moving to a paid tier.

Pros and cons

• Pros: Multiple crawl modes and support for HTML, images, JavaScript, CSS and PDFs make it useful across varied site content.
• Pros: URL-level SEO data, inlink analysis, Lighthouse audits and scheduled monitoring cover several technical SEO workflows in one service.
• Pros: Web access and a documented REST API support both direct use and automation, without local installation or server management.
• Cons: Free is capped at 10,000 URLs per session and 20 monitored URLs, limiting its role for larger or ongoing programs.
• Cons: Lite, Ultimate and Enterprise have custom pricing, making cost comparisons harder before requesting a quote.
• Cons: Premium costs £39.99 a month, and the general crawl limit is 100,000 pages per crawl despite higher session allowances on paid tiers.

Alternatives

For a desktop crawler with a small free crawl allowance, consider Crawlix: its Free plan covers 100 pages per crawl, one project, one device and two concurrent connections, and it also offers a free trial. Crawlr is another web-and-API option; its free tier includes full-site crawling, SEO intelligence and DIQ score, CSV and JSON exports, one concurrent crawl, 500 tokens per month and 15-day crawl history.

Netpeak Spider may suit teams preferring a Windows or macOS desktop tool: its free plan covers 500 URLs, five threads and two devices per user, and it offers a free trial. Choose SEO4Ajax for a web, API or extension option with a free Developer Plan of 1,000 pages and 2,500 snapshots per month, or a $29 a month Project Plan.

Seodar offers web and API access with a free plan covering one site, 200 pages per crawl, 100 one-time credits and one team member; its Starter plan is €29 a month. A1 Website Analyzer is a Windows and macOS alternative with a free mode that continues after a 30-day evaluation period, plus a free trial.

Crawlie is a free option spanning API, web and desktop platforms; its free plan includes 200 credits per month, three sites, 1,000 pages per crawl and one seat. CrawlX offers a web-and-API free tier with 500 URLs per crawl, five crawls per month, one project, 150+ SEO checks and CSV, JSON and PDF exports.

Browse more options in Technical SEO Software or SEO tools.

Verdict

CrawlZilla is best for technical SEO teams that want cloud crawling, URL diagnostics, link analysis, Lighthouse audits and scheduled monitoring together, with API access for automation. Its main advantage is the breadth of that combined workflow and the higher-capacity tiers; its main drawback is that the most substantial quotas require plans without published prices, while the standard crawl limit remains 100,000 pages per crawl. Choose it if those tools and cloud delivery outweigh quota and pricing uncertainty; look elsewhere for a desktop-first workflow or clearer pricing across larger plans.