What are the Lenses?
Lenses are a new way to navigate Oncrawl analyses. They group related insights into predefined entry points based on common SEO use cases.
Instead of switching between menus, reports, or configurations, you can start directly with the analysis you need.
The available five lenses are:
Crawl Discovery: Jump-start your SEO analysis with clear, easy to understand reports that track site health.
Content: Audit content quality from an SEO and AI Search perspective, identify weak pages, and prioritize content improvements.
Sanity Check: Run quick checks on key pages to catch and fix critical technical issues before they escalate.
Performance: Track Core Web Vitals and page load times to spot performance issues.
Crawl over crawl: Useful to measure the real impact of JS rendering
Focus on the project page
The project page is the hub for lenses.
When you open a project, you'll see entry points for each available lens. From here you can:
Create a crawl configuration
Choose a custom strategy or pick a lens
Launch a crawl with the lens and its built-in dashboards
Focus on each lens
1. Crawl Discovery
The Crawl Discovery lens gives you an overview of crawls in your project. It helps you quickly find the right crawl for deeper analysis.
How to use it:
Go to your Project page.
Clic on “Create configuration”
Click on "Discovery"
Click on: "Use this crawl configuration"
Click on: "Create & launch crawl configuration"
Make the most of it:
Use this lens as your first step when starting with Oncrawl.
2. Content
The Content Lens helps you audit content quality at scale from an SEO and AI Search perspective.
It analyzes pages during a crawl and provides a structured evaluation of how well your content answers user intent, covers important related topics, and presents information clearly for users, search engines, and AI-powered search experiences.
The Content Lens provides:
a Content Quality Score;
five quality scores: Query Fanout Coverage, Relevance & User Experience, Meta Tags Optimization, Heading Structure, and Grammar & Spelling;
short explanations for each score;
improvement suggestions when relevant;
recommended actions for improvement;
dedicated dashboards to review content quality and prioritize optimizations.
How to use it
Go to your Project page.
Click on Create configuration.
Select Content Lens.
Configure your crawl.
Define which pages should be analyzed using the available Content Lens filters and limits.
Launch the crawl.
Open the Content Lens dashboards to review results.
For detailed setup instructions, read Content Lens Guide: How to enable the content quality analysis.
To understand how scores, metrics, and recommendations are calculated, read Content Lens scoring and metrics definitions.
3. Sanity Check
The Sanity Check Lens validates crawl configurations. It detects errors and ensures everything is correct before launching a crawl.
How to use it:
Go to your Project page
Clic on “Create configuration”
Click on "Sanity check"
Upload a seed file that meets these rules:
.ZIP format
File size under 10 MB
One column with URLs
Make the most of it:
Highlight business-critical pages
Set up a daily schedule
Activate template alerts after your first crawl
4. Performance
The Performance Lens adds site performance data to your crawl. It shows how technical performance impacts SEO.
How to use it:
Go to your Project page
Clic on “Create configuration”
Click on "Performance"
Upload a seed file that meets these rules:
.ZIP format
File size under10 MB
One column with URLs
Make the most of it:
Monitor Core Web Vitals and page speed on key pages
Set up a daily schedule
Create template alerts after your first crawl
5. Crawl over crawl Lense: Detect how Javascript alters content & link discoverability for LLM bots.
After setting up your Crawl over crawl lense, you can consult this Dashboard pointing out the mismatches between Crawl 1 (Raw HTML) and Crawl 2 (JS rendering) by technical type issues such as:
Content
Performances
