Site Audit vs Lighthouse: Detailed Comparison

Quick answer: Site Audit and Lighthouse both test website performance, accessibility, and SEO, but serve different audiences. Site Audit tests 9 browsers (Chrome, Firefox, Safari iOS/macOS, Edge, Brave, Instagram/Facebook in-app), $50, includes schema markup validation, WCAG compliance, content gap analysis (Pro), Intelligence Token API. Lighthouse tests Chrome only, free, developer CLI tool, performance-focused. Choose Site Audit for: cross-browser testing, non-technical teams, schema/WCAG depth. Choose Lighthouse for: dev workflows, Chrome-only focus, budget constraints.

Reading time: 12 minutes

In this guide:

• Site Audit tests 9 browsers (Chrome/Firefox/Safari/Edge/Brave/iOS/Android/Instagram/Facebook in-app) vs Lighthouse’s 1 (Chrome only) where Site Audit catches Safari-specific CSS bugs, Instagram in-app browser restrictions, and cross-browser performance variance that Lighthouse misses, critical for e-commerce sites losing 10-20% of conversions to browser-specific issues
• Site Audit includes built-in schema markup validation, Lighthouse has none where Site Audit validates LocalBusiness/Service/Review schema completeness across all pages automatically while Lighthouse requires separate Google Rich Results Test runs manually, with schema improving AI Presence Rate by 15-30% making validation essential for AI visibility
• Site Audit provides 150+ WCAG accessibility checks vs Lighthouse’s about 50 using pa11y engine for comprehensive WCAG 2.1 AA compliance needed for ADA lawsuit risk mitigation (average settlement $10K-20K), while both catch basic issues like missing alt text and color contrast
• Site Audit adds content gap analysis and competitor benchmarking ($50) by comparing your site to 3 competitors to identify missing service pages (“Emergency AC Repair” page gap), thin content (< 300 words), and competitive ranking (#2 out of 4 for Overall Score), features Lighthouse completely lacks
• Use both tools together strategically with Lighthouse for daily development (free, instant, Chrome-focused CI/CD), Site Audit ($50) for pre-launch cross-browser verification, and Site Audit ($50) quarterly for audit covering performance, accessibility, SEO, security, and mobiles with competitive analysis, saving 95% vs manual testing (12-18 hours → 45 minutes)

Bottom line: Lighthouse is excellent free developer tool. Site Audit is comprehensive paid service for cross-browser testing and business-focused insights.

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Feature Comparison Table

Feature	Site Audit	Site Audit	Lighthouse (Free)
Price	$50	$50	Free
Pages Tested	Up to 30	Up to 100	1 page per run
Browsers Tested	9	9	1 (Chrome)
Mobile Testing	Yes (iOS, Android)	Yes	Yes (Chrome Android emulation)
Desktop Testing	Yes (Chrome, Firefox, Safari, Edge, Brave)	Yes	Yes (Chrome desktop)
In-App Browser Testing	Yes (Instagram, Facebook)	Yes	No
Performance Testing	Yes	Yes	Yes
Accessibility (WCAG)	Yes (150+ checks)	Yes	Yes (about 50 checks)
SEO Testing	Yes	Yes	Yes
Security Testing	Yes	Yes	No (separate tools)
Schema Markup Validation	Yes	Yes	No
Content Gap Analysis	No	Yes	No
Competitor Benchmarking	No	Yes (3 competitors)	No
Core Web Vitals	Yes (LCP, CLS, INP)	Yes	Yes (LCP, CLS, INP)
Intelligence Token API	Yes	Yes	No (JSON export only)
Report Format	PDF + JSON (API)	PDF + JSON	HTML + JSON
Delivery	about 15-30 minutes	about 15-30 minutes	Instant (local)
CI/CD Integration	Via API	Via API	Yes (CLI)
Bulk Testing	Yes (30-100 pages)	Yes	No (script required)

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Browser Coverage

Site Audit (9 Browsers)

Desktop browsers:

1. Chrome (desktop)
2. Firefox (desktop)
3. Safari (macOS)
4. Edge (desktop)
5. Brave (desktop)

Mobile browsers: 6. Safari (iOS) 7. Chrome (Android)

In-app browsers: 8. Instagram in-app browser 9. Facebook in-app browser

Why 9 browsers: Cross-browser compatibility testing (users access websites from diverse browsers, not just Chrome)

Instagram/Facebook in-app: 3B+ combined users, unique rendering engines, often break layouts that work in standard browsers

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Lighthouse (1 Browser)

Chrome only: Desktop and mobile (emulated)

Mobile testing: Chrome DevTools device emulation (not real iOS Safari)

Missing:

• Firefox (Gecko engine)
• Safari (WebKit engine)
• In-app browsers (Instagram, Facebook)
• Brave (privacy-focused modifications)

Why Chrome-only: Lighthouse is Google tool, designed for Chrome DevTools integration

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Browser Coverage Winner: Site Audit (9 vs 1)

Site Audit advantage: Real cross-browser testing

Example: CSS Grid layout works in Chrome (Lighthouse passes), breaks in Safari iOS (Site Audit catches)

Lighthouse advantage: Chrome is 65% global market share (good representative sample)

Choose Site Audit if: Users access your site from diverse browsers (e-commerce, public-facing sites)

Choose Lighthouse if: Users primarily use Chrome (internal tools, developer-focused products)

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Accessibility Testing Depth

Site Audit: 150+ WCAG 2.1 AA Checks

Testing tool: pa11y (industry-standard accessibility engine)

Checks include:

• Missing alt text on images
• Form labels missing
• Color contrast ratios (4.5:1 for text, 3:1 for large text)
• Heading hierarchy (H1 → H2 → H3, no skipping)
• ARIA attributes validity
• Keyboard navigation
• Focus indicators
• Semantic HTML

Standard: WCAG 2.1 Level AA (legal standard for ADA compliance)

Coverage: about 70% of WCAG issues (automated testing limit)

Learn more: What is WCAG Compliance

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Lighthouse: about 50 Accessibility Checks

Testing tool: axe-core (also industry-standard)

Checks include:

• Alt text
• Form labels
• Color contrast
• ARIA attributes
• Heading hierarchy

Standard: WCAG 2.1 Level AA (same as Site Audit)

Coverage: about 50-60% of WCAG issues

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Accessibility Winner: Site Audit (150+ vs about 50 checks)

Site Audit advantage: more thorough with 150+ checks (150+ checks vs about 50)

Example: Site Audit catches missing lang attribute on <html> tag, Lighthouse may miss it

Both require manual review: Automated testing catches 50-70% of WCAG issues. Manual testing needed for remaining 30-50% (alt text quality, logical tab order, content clarity)

For ADA compliance: Use Site Audit (more thorough), then manual review for full WCAG 2.1 AA compliance

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Schema Markup Validation

Site Audit: Built-In Schema Testing

Validates:

• LocalBusiness schema (presence, completeness)
• Service schema (if applicable)
• Review/AggregateRating schema
• Organization schema
• JSON-LD syntax errors

Checks:

• Schema present on homepage?
• Required fields included (name, address for LocalBusiness)?
• Valid JSON syntax?
• Correct @type for business (e.g., HVACBusiness vs generic LocalBusiness)?

Output: Page-by-page schema status (missing, invalid, incomplete, valid)

Learn more: What is Schema Markup

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Lighthouse: No Schema Testing

Not included: Lighthouse doesn’t validate schema markup

Alternative: Use Google Rich Results Test separately (manual, one page at a time)

Workaround: Run Lighthouse + Rich Results Test + Site Audit (use all three)

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Schema Winner: Site Audit (Lighthouse has no schema testing)

Site Audit advantage: Integrated schema validation across all tested pages

Why it matters: Schema markup critical for AI visibility (AI Visibility Presence Rate correlates with schema completeness). Businesses without schema have 15-30% lower Presence Rate.

Lighthouse gap: Must use separate tools for schema (Google Rich Results Test, Schema.org Validator)

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Content Gap Analysis (Site Audit Only)

Site Audit: Content Gap Detection

What it finds:

• Missing service pages (competitors have “Emergency AC Repair” page, you don’t)
• Missing location pages (competitors target “Phoenix AC Repair”, you have no Phoenix-specific page)
• Missing FAQ sections (competitors answer common questions, you don’t)
• Thin content (pages with < 300 words)

How it works:

1. Site Audit analyzes your site structure
2. Compares to competitor sites (up to 3 competitors)
3. Identifies gaps (pages/topics competitors have, you don’t)

Output: Prioritized list of content to create (highest impact first)

Example:

• Gap: “AC financing options” (3/3 competitors have dedicated page, you mention financing in passing)
• Impact: High (buyer intent keyword, low competition)
• Recommendation: Create dedicated “AC Financing Options Phoenix” page

Included in: Site Audit only ($50)

Learn more: Site Audit vs Pro

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Lighthouse: No Content Gap Analysis

Not included: Lighthouse is technical testing tool (performance, accessibility, SEO basics)

Alternative: Manual competitor analysis or separate SEO tools (Ahrefs, SEMrush)

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Content Gap Winner: Site Audit (Lighthouse has no content analysis)

Site Audit advantage: Integrated competitive content analysis

Use case: You run Site Audit, discover technical issues AND missing content opportunities in one report (vs running Lighthouse + separate SEO tool)

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Competitor Benchmarking

Site Audit: Head-to-Head Comparison

Compare your site to 3 competitors:

• Overall scores (your 68 vs Competitor A 72 vs Competitor B 61)
• Category scores (Performance, Accessibility, Security, Technical SEO)
• Content gaps (what they have that you don’t)
• Schema markup completeness (who has better LocalBusiness schema)

Output: Competitive ranking (you rank #2 out of 4 for Overall Score)

Use case: Identify if competitors have technical advantage (better performance, more complete schema) or content advantage (more thorough with 150+ checks service pages)

Included in: Site Audit only ($50)

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Lighthouse: No Competitor Testing

Manual workaround: Run Lighthouse on competitor sites separately, compare scores manually

Time: 15-30 minutes per competitor (run Lighthouse, export JSON, compile spreadsheet)

Site Audit: Automated (competitors analyzed in same report)

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Competitor Benchmarking Winner: Site Audit (Lighthouse requires manual work)

Site Audit advantage: Automated competitive analysis

Lighthouse alternative: Free but manual (run Lighthouse on each competitor URL, compare results yourself)

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CI/CD Integration

Site Audit: Intelligence Token API

Workflow:

1. Run Site Audit (via API call or manual)
2. Receive Intelligence Token (format: SCAN-YYYY-MM-XXXXX)
3. Fetch JSON via API: https://api.surmado.com/intelligence/{TOKEN}
4. Parse overall_score, category_scores, issues
5. Fail build if overall_score < 70 (or custom threshold)

Example (GitHub Actions):

- name: Run Scan and Check Score
  run: |
    TOKEN=$(curl -X POST https://api.surmado.com/scan \
      -d "url=https://staging.mysite.com" | jq -r '.token')
    SCORE=$(curl https://api.surmado.com/intelligence/$TOKEN | jq '.overall_score')
    if [ $SCORE -lt 70 ]; then
      echo "Scan score $SCORE below threshold 70"
      exit 1
    fi

Learn more: API Integration Overview

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Lighthouse: Native CI/CD Support

Lighthouse CI (official tool):

npm install -g @lhci/cli
lhci autorun --collect.url=https://staging.mysite.com

GitHub Actions (example):

- name: Run Lighthouse CI
  run: |
    npm install -g @lhci/cli
    lhci autorun

Fail thresholds:

{
  "ci": {
    "assert": {
      "assertions": {
        "categories:performance": ["error", {"minScore": 0.9}],
        "categories:accessibility": ["error", {"minScore": 0.9}]
      }
    }
  }
}

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CI/CD Winner: Tie (Both Support CI/CD)

Lighthouse advantage: Native CI/CD tool (Lighthouse CI), widely adopted in dev workflows

Site Audit advantage: Intelligence Token API enables custom integrations (Zapier, Make, n8n for non-devs)

Choose Lighthouse if: Dev team already uses Lighthouse CI in pipeline

Choose Site Audit if: Non-technical team needs automated testing (via Zapier) or cross-browser CI/CD (Lighthouse CI tests Chrome only)

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Pricing and ROI

Site Audit Pricing

**** ($50):

• 30 pages tested
• 9 browsers
• Performance, Accessibility, Security, SEO
• Schema markup validation
• Intelligence Token API
• PDF report

Pro ($50):

• 100 pages tested
• Everything in
• Content gap analysis
• Competitor benchmarking (3 competitors)

When to use:

• : Small sites (< 30 pages), basic technical testing
• Pro: Large sites (30-100 pages), competitive analysis needed

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Lighthouse: Free

Cost: $0

Runs: Unlimited (local CLI, no API limits)

When to use: Frequent testing (every commit), developer-focused, Chrome-only acceptable

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ROI Comparison

Scenario 1: Developer testing staging site before launch

• Lighthouse: Free, instant, Chrome-only
• Site Audit: $50, 15-30 min, 9 browsers
• Winner: Lighthouse (free, instant for dev workflow)

Scenario 2: Agency testing 20 client sites monthly

• Lighthouse: Free, but manual for each site (20 × 15 min = 5 hours/month)
• Site Audit: $500-1,000/month, automated via API (1 hour setup, then automatic)
• Winner: Site Audit (ROI positive if your time worth > $100/hour)

Scenario 3: E-commerce site losing conversions on Safari iOS

• Lighthouse: Tests Chrome only (can’t detect Safari-specific issues)
• Site Audit: Tests Safari iOS (finds layout breaking on iPhone)
• Winner: Site Audit (catches browser-specific bugs Lighthouse misses)

Scenario 4: Small business checking site health quarterly

• Lighthouse: Free, manual quarterly test (30 min)
• Site Audit: $50 quarterly ($100/year)
• Winner: Lighthouse (free sufficient for quarterly check)

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Use Case Recommendations

Choose Site Audit If You…

Need cross-browser testing:

• Users access site from Safari, Firefox, mobile browsers
• E-commerce site (conversions depend on all browsers working)
• High-traffic public site (can’t afford browser-specific bugs)

Are non-technical:

• No CLI experience
• Want PDF report (not JSON)
• Need automated testing (Zapier, not GitHub Actions)

Value comprehensive testing:

• Schema markup validation (critical for AI visibility)
• Content gap analysis (competitive SEO)
• Competitor benchmarking (rank #1 vs #4 in technical quality)

Test large sites:

• 30-100 pages (Lighthouse requires scripting for bulk testing)
• Automated page discovery (Site Audit crawls site, Lighthouse needs URL list)

Need WCAG compliance depth:

• 150+ checks (vs Lighthouse’s about 50)
• ADA lawsuit risk mitigation

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Choose Lighthouse If You…

Are a developer:

• Comfortable with CLI tools
• Integrate testing into CI/CD pipeline
• Want instant local results (no waiting for external service)

Focus on Chrome:

• Users primarily use Chrome (65% market share)
• Internal tools (control browser environment)
• Progressive Web App (PWA) testing (Lighthouse has PWA category)

Budget constraints:

• Free forever (unlimited runs)
• No per-test fees
• No account/subscription needed

Test frequently:

• Every git commit (CI/CD)
• A/B testing (run 100+ tests/day)
• Performance monitoring (hourly checks)

Need custom checks:

• Lighthouse plugins (custom audits)
• Scripting (automate with Puppeteer)

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What Site Audit Catches That Lighthouse Misses

1. Safari-Specific Issues

Example: CSS Grid layout with auto-fill breaks in Safari 14 (works in Chrome)

Lighthouse: Passes (tests Chrome only)

Site Audit: Fails (tests Safari, catches bug)

Impact: 20% of users on Safari see broken layout

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2. In-App Browser Issues

Example: Instagram in-app browser blocks external links (security restriction)

Lighthouse: Passes (doesn’t test in-app browsers)

Site Audit: Fails (tests Instagram in-app, catches issue)

Impact: 10-15% of social media traffic (Instagram/Facebook) can’t navigate site

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3. Schema Markup Completeness

Example: LocalBusiness schema missing areaServed field

Lighthouse: No check (doesn’t validate schema)

Site Audit: Incomplete schema (missing recommended field)

Impact: Lower AI Presence Rate (AI platforms can’t determine service area)

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4. Content Gaps vs Competitors (Pro)

Example: 3 competitors have “Emergency AC Repair” page, you don’t

Lighthouse: No check (doesn’t analyze competitors)

Site Audit: Content gap identified (recommendation to create page)

Impact: Losing emergency service leads to competitors

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5. Cross-Browser Performance Variance

Example: LCP 2.1s in Chrome (good), 3.8s in Firefox (needs improvement)

Lighthouse: 2.1s (Chrome only)

Site Audit: 2.1s Chrome, 3.8s Firefox (cross-browser variance)

Impact: 25% of users (Firefox) see slow site

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Using Both Tools Together

Recommended Workflow

Development (daily):

• Use Lighthouse (free, instant, local)
• Catch performance/accessibility issues early
• Integrate into CI/CD (Lighthouse CI)

Pre-launch (before major release):

• Run Site Audit ($50)
• Verify cross-browser compatibility
• Check schema markup
• Final WCAG compliance check (150+ checks)

Quarterly audit (competitive analysis):

• Run Site Audit ($50)
• Content gap analysis (what competitors have)
• Benchmark vs top 3 competitors
• Comprehensive 9-browser testing

Result: Lighthouse for dev workflow, Site Audit for audit covering performance, accessibility, SEO, security, and mobiles

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Common Questions

Is Lighthouse really free forever?

Yes. Lighthouse is open-source (Apache 2.0 license), maintained by Google. No usage limits, no hidden fees.

Can Site Audit replace Lighthouse in CI/CD?

Yes, via Intelligence Token API. But Lighthouse CI is more developer-friendly (native tool, no external dependency). Site Audit better for non-dev teams or cross-browser CI/CD.

Which is more accurate for Core Web Vitals?

Both measure Core Web Vitals accurately for Chrome. Site Audit measures CWV across 9 browsers (more thorough with 150+ checks). Google Search uses Chrome CWV for rankings (Lighthouse sufficient for SEO).

Does Site Audit use Lighthouse under the hood?

No. Site Audit uses separate testing engines (pa11y for accessibility, custom performance testing, schema validators). Both measure similar metrics but with different tools.

Can I run Lighthouse on Safari/Firefox?

No. Lighthouse is Chrome-only tool (requires Chrome DevTools Protocol). Use Site Audit for Safari/Firefox testing.

Which tool do agencies prefer?

Agencies with dev teams: Lighthouse (free, customizable). Agencies with non-technical teams: Site Audit (automated, cross-browser, PDF reports). Many use both (Lighthouse for dev, Site Audit for client reports).

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Final Recommendation

For developers: Start with Lighthouse (free, instant, CI/CD-ready)

• Use daily in development
• Integrate into GitHub Actions
• Sufficient for Chrome-focused testing

For non-technical teams: Use Site Audit ($50)

• Cross-browser testing (9 browsers)
• PDF reports (no CLI needed)
• Schema markup validation
• WCAG compliance depth

For agencies: Use Site Audit ($50) quarterly + Lighthouse daily

• Site Audit: audit covering performance, accessibility, SEO, security, and mobiles, competitor analysis, content gaps
• Lighthouse: Dev workflow, frequent testing, free

For e-commerce/high-traffic sites: Use both

• Lighthouse: Dev testing (every commit)
• Site Audit: Pre-launch verification (cross-browser, WCAG, schema)

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Want to try Site Audit? Try it free or Run Site Audit ($50) for 30 pages across 9 browsers, schema validation, 150+ WCAG checks. Upgrade to Pro ($50) for 100 pages, content gap analysis, competitor benchmarking. 7-day money-back guarantee. Already have an account? Log in.