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SEO · head to head

Lighthouse vs Screaming Frog SEO Spider

Lighthouse logo

Lighthouse

SEO

Audit web page performance and quality

From
Free
Rated
-
Full reviewWebsite
Screaming Frog SEO Spider logo

Screaming Frog SEO Spider

SEO

Desktop crawler for technical SEO audits and site analysis

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Lighthouse performance scores vary significantly due to A/B testing, device differences, browser extensions, and antivirus software affecting results; Screaming Frog SEO Spider free version limited to 500 URL crawl limit for meaningful analysis
  • They diverge on capability: Lighthouse covers Performance scoring, Screaming Frog SEO Spider covers Crawl up to 500 URLs (free) or unlimited (paid).
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Lighthouse and Screaming Frog SEO Spider actually diverge.

Attributes where Lighthouse and Screaming Frog SEO Spider differ
AttributeLighthouseScreaming Frog SEO Spider
Pricing modelfreesubscription
PlatformsChrome, EdgeWindows, macOS, Linux
Founded1998Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (SEO).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Lighthouse

  • Performance scoring
  • Accessibility audit
  • SEO check
  • PWA validation
  • Chrome support
  • Edge support

Only in Screaming Frog SEO Spider

  • Crawl up to 500 URLs (free) or unlimited (paid)
  • 300+ SEO issue checks
  • JavaScript rendering with Chromium
  • XML sitemap generation
  • Custom data extraction
  • Google integrations
  • Scheduled crawls and comparisons
  • Multi-language support

What people use each for

The jobs each tool is most often brought in to do.

Lighthouse

  • Performance auditing to identify page loading speed improvementsnot Screaming Frog SEO Spider
  • Accessibility compliance checking for users with disabilitiesnot Screaming Frog SEO Spider
  • SEO optimization verification for search engine compatibilitynot Screaming Frog SEO Spider
  • Security and best practices scanning for code healthnot Screaming Frog SEO Spider
  • Progressive web app validation and CI/CD pipeline integrationnot Screaming Frog SEO Spider

Screaming Frog SEO Spider

  • Identify broken links and server errors on large sitesnot Lighthouse
  • Audit redirect chains during site migrationsnot Lighthouse
  • Analyze and fix duplicate content issuesnot Lighthouse
  • Extract and validate structured data on pagesnot Lighthouse
  • Monitor site health with scheduled crawlsnot Lighthouse

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Lighthouse

  • Performance scores vary significantly due to A/B testing, device differences, browser extensions, and antivirus software affecting results
  • Limited to metrics that contribute to scores; Opportunities and Diagnostics don't directly impact scoring
  • Diminishing returns above 0.96 score, making perfect 100 scores extremely challenging
  • Scores based on HTTP Archive data which may not reflect all performance scenarios

Screaming Frog SEO Spider

  • Free version limited to 500 URL crawl limit for meaningful analysis
  • Desktop application required, not available as web-based tool
  • Unlimited crawls depend on system memory and storage capacity
  • Annual licensing model with no monthly option
  • Learning curve for advanced features like custom extraction

Pricing, plan by plan

Lighthouse

Free
  • FreeFree
    • Performance audit
    • Accessibility check
    • SEO analysis

Screaming Frog SEO Spider

Free
  • FreeFree
    • 500 URL crawl limit
    • Core features included
    • Link checking and metadata analysis
  • Paid License$199/year
    • Unlimited URL crawls (limited by system memory/storage)
    • All free version features
    • Advanced features unlocked

Which should you pick?

Choose Lighthouse if

  • You need performance scoring.
  • You want to start without paying.
  • You work on Chrome, Edge.
  • You also want accessibility audit.
Lighthouse review

Choose Screaming Frog SEO Spider if

  • You need crawl up to 500 urls (free) or unlimited (paid).
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want 300+ seo issue checks.
Screaming Frog SEO Spider review

Questions people ask

Is Lighthouse or Screaming Frog SEO Spider better?
Neither clearly leads. Lighthouse starts at Free and Screaming Frog SEO Spider at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Lighthouse or Screaming Frog SEO Spider?
Lighthouse starts at Free and Screaming Frog SEO Spider at Free.
Does Lighthouse or Screaming Frog SEO Spider run on more platforms?
Lighthouse runs on Chrome, Edge. Screaming Frog SEO Spider runs on Windows, macOS, Linux.
Can I use Lighthouse for free?
Both have a free tier, so you can try either at no cost before committing.
What is Lighthouse best used for?
Lighthouse is most often used for performance auditing to identify page loading speed improvements, accessibility compliance checking for users with disabilities, seo optimization verification for search engine compatibility, security and best practices scanning for code health. Of those, performance auditing to identify page loading speed improvements and accessibility compliance checking for users with disabilities are not what Screaming Frog SEO Spider is typically brought in for.
What can Lighthouse do that Screaming Frog SEO Spider cannot?
Lighthouse covers Performance scoring, Accessibility audit, SEO check, PWA validation. Screaming Frog SEO Spider covers Crawl up to 500 URLs (free) or unlimited (paid), 300+ SEO issue checks, JavaScript rendering with Chromium, XML sitemap generation.

Answered from the vendors’ own pages

Lighthouse: Is Lighthouse free?

Yes. Lighthouse is completely free and open-source. It is developed by Google and integrated into Chrome DevTools, PageSpeed Insights, and available as a command-line tool. There are no licensing fees or premium tiers.

Source
Screaming Frog SEO Spider: What is the difference between free and paid Screaming Frog licenses?

The free version crawls up to 500 URLs with core features. The paid license (GBP 199/year) includes unlimited URL crawls limited only by system memory and storage, plus advanced features.

Source
Lighthouse: Can I run Lighthouse offline?

Yes. Lighthouse can run offline in multiple ways: through Chrome DevTools (built into Chrome), as a command-line tool (Node.js), or as a Node.js module integrated into your build process. You do not need an internet connection after installing the tool.

Source
Screaming Frog SEO Spider: Can Screaming Frog crawl JavaScript-rendered content?

Yes. Screaming Frog renders JavaScript through headless Chromium, enabling crawls of React, Angular, Vue.js, and other JavaScript frameworks.

Source
Lighthouse: What pages can Lighthouse audit?

Lighthouse can audit any web page, including pages that require authentication. This is an advantage over some alternative tools that cannot test behind login screens. You can run audits on public pages or authenticated pages via command-line with custom headers.

Source
Screaming Frog SEO Spider: What platforms does Screaming Frog support?

Screaming Frog SEO Spider is available for Windows, macOS (Apple Silicon and Intel), and Linux (Ubuntu and Fedora).

Source
Lighthouse: Can Lighthouse prevent performance regression during development?

Yes. Lighthouse CI is available to prevent performance degradation during development cycles. You can integrate Lighthouse CI into your continuous integration pipeline to automatically audit pages on every commit and fail builds if performance metrics fall below thresholds you define.

Source
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