
Best for: Technical SEO specialists, agency teams, and enterprise-level businesses managing large, complex websites who need deep data-driven insights from crawl and log files to optimize site health and crawl budget.
Data-driven technical SEO crawler with log analysis
Company
Integrations
Pricing
Starting at $69/mo
Setup
Oncrawl stands out as a sophisticated technical SEO crawler and log analyzer, designed to provide profound insights into how search engines interact with large and complex websites. Unlike simpler crawlers, Oncrawl integrates website crawl data with server log files, offering a holistic view of indexation, crawl budget allocation, and overall site health. This dual-data approach allows SEO professionals to not only identify technical issues but also understand their real-world impact on search engine bots. It's particularly well-suited for mid-market to enterprise-level organizations, e-commerce platforms, and publishing sites that grapple with vast amounts of URLs and dynamic content.
The platform excels in its ability to visualize complex data through customizable dashboards and detailed reports, making it easier to pinpoint critical technical SEO problems like duplicate content, crawl anomalies, and internal linking inefficiencies. Its advanced capabilities extend to JavaScript crawling, allowing for comprehensive analysis of client-side rendered websites, which is crucial in today's web landscape. However, the depth of its features comes with a learning curve; beginners might find the interface and data interpretation challenging without prior technical SEO knowledge.
While Oncrawl delivers unparalleled technical insights, its primary focus remains on the technical infrastructure rather than content optimization or on-page recommendations. Users should expect a powerful diagnostic tool that requires a skilled SEO analyst to translate its data into actionable strategies. The platform's strength lies in its ability to monitor SEO performance changes over time, track the impact of technical deployments, and provide a granular understanding of how search engines perceive a site, making it an indispensable asset for proactive technical SEO management. Its robust API also allows for integration into existing SEO workflows, enhancing its utility for large teams and agencies.

Comprehensive website crawling to identify technical SEO issues like broken links, duplicate content, and indexing problems.
Integrates server log data to understand how search engine bots crawl a site, revealing crawl budget waste and indexation issues.
Combines crawl, log, and analytics data to provide a holistic view of SEO performance and technical health.
Allows users to build personalized dashboards to monitor key SEO metrics and visualize data specific to their needs.
Tracks the effects of technical deployments and algorithm updates on website performance over time.
Enables the crawling and analysis of client-side rendered websites, crucial for modern web applications.
Identifies opportunities to improve internal linking structure for better page authority distribution and crawlability.
Provides advanced filtering and segmentation capabilities to dive deep into specific datasets and uncover hidden insights.
Company Size
Industries
Identify Crawl Budget Issues
By combining crawl and log data, Oncrawl helps pinpoint pages frequently crawled but not indexed, or critical pages being ignored by bots, allowing for optimized crawl budget allocation.
Optimize Internal Linking
The tool visualizes internal link juice distribution and identifies orphaned pages or inefficient linking structures, enabling users to improve site architecture for better SEO.
Website Migration Validation
Before and after a major site migration, Oncrawl can crawl the old and new sites and analyze log files to ensure all critical pages are indexed and no significant SEO value is lost.
Monitor Technical SEO Health Post-Deployment
Regularly scheduled crawls and log analysis allow teams to proactively detect new technical issues introduced by code deployments or content updates, preventing long-term SEO damage.
Starter
$69/mo
billed annually
Best for: Small to medium websites needing core technical SEO insights.
Business
$249/mo
billed annually
Best for: Growing businesses and agencies managing multiple medium to large websites.
Enterprise
Custom
contact for quote
Best for: Large enterprises, complex e-commerce platforms, and agencies requiring advanced features and dedicated support.
Pricing may have changed. Verify current plans on Oncrawl's website.
| Feature | Oncrawl | Fonzy | Together |
|---|---|---|---|
| Content Creation | Oncrawl identifies technical issues affecting content visibility (e.g., duplicate content, indexability) at a site-wide level. | Fonzy ensures every published article meets technical SEO standards automatically before publication. | Oncrawl validates the overall site architecture and technical health, while Fonzy ensures individual content pieces are technically sound from creation, preventing issues from the outset. |
| Technical SEO Audit | Oncrawl performs deep technical audits across the entire website, identifying global issues like crawl budget waste or broken links. | Fonzy acts as a pre-publication gatekeeper, validating content against technical SEO rules like proper heading structure, image alt tags, and internal linking. | Oncrawl diagnoses macro technical problems, and Fonzy ensures micro-level content technical compliance, creating a robust, error-free technical foundation. |
| Site Performance Monitoring | Oncrawl monitors how search engines crawl and index the site over time, revealing performance trends and issues at scale. | Fonzy continuously checks published articles for adherence to technical best practices, identifying potential decay in content-specific technical performance. | Oncrawl provides the big picture of site-wide technical performance, while Fonzy offers granular, content-specific technical health monitoring, ensuring both scale and detail. |
| Data Analysis | Oncrawl provides extensive data visualization and cross-analysis of crawl, log, and analytics data for overarching technical insights. | Fonzy offers specific, actionable insights directly related to the technical quality of individual content pieces, guiding immediate improvements. | Oncrawl offers comprehensive diagnostic data for strategic planning, and Fonzy provides prescriptive, content-level technical improvements, bridging strategy with execution. |
| Deployment Assurance | Oncrawl helps validate technical changes during site migrations or major updates by comparing site states and log data. | Fonzy ensures that new content deployments are technically sound from day one, preventing common technical SEO errors from ever going live. | Oncrawl ensures the technical integrity of large-scale site changes, while Fonzy guarantees the technical quality of every new content piece, ensuring continuous, robust SEO health. |
Better Together
Oncrawl combines crawl data with log analysis for deep technical insights — Fonzy ensures every published article meets those technical standards automatically.
Content Creation
Oncrawl validates the overall site architecture and technical health, while Fonzy ensures individual content pieces are technically sound from creation, preventing issues from the outset.
Technical SEO Audit
Oncrawl diagnoses macro technical problems, and Fonzy ensures micro-level content technical compliance, creating a robust, error-free technical foundation.
Site Performance Monitoring
Oncrawl provides the big picture of site-wide technical performance, while Fonzy offers granular, content-specific technical health monitoring, ensuring both scale and detail.
Data Analysis
Oncrawl offers comprehensive diagnostic data for strategic planning, and Fonzy provides prescriptive, content-level technical improvements, bridging strategy with execution.
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