ContentLens - On-Page SEO Analyzer

About

ContentLens is a free on-page SEO Chrome extension that opens in Chrome's side panel and gives you a complete audit of any page in one click.

What you get:

Overview
- SERP preview showing how your page appears in Google search results
- Page title with character count and pixel width (tagged against Screaming Frog thresholds)
- Meta description with character count and pixel width
- Canonical URL, robots meta, indexability status
- URL length check and language tag
- Word count

Headings
- H1-H6 counts and full tree view
- Skip-level detection (e.g. H2 jumping to H4)
- Multiple H1 detection
- Empty heading detection
- Over-70-character warnings on H1s and H2s

E-E-A-T signals
- Author name, bio, and author page link (extracted from JSON-LD schema and DOM)
- Published and modified dates with freshness tag
- Flesch reading ease score
- Multi-format detection (video, audio, iframe)

Links
- Content-only filter (excludes nav/footer links using semantic markup detection)
- Total, unique, internal, external, and empty-anchor counts
- Anchor text + URL for every link, filterable by type

Images
- Total count, missing alt, missing title
- Alt coverage percentage with color-coded tag
- Image preview with alt text inline
- Filter to show only images missing alt
- Lazy-load and srcset aware (handles data-src, picture elements)
- Tracking pixels filtered out

Schema
- JSON-LD inline tree view with all @type values listed
- Hreflang table

Social
- Open Graph and Twitter Card previews rendered with actual images
- All og: and twitter: tags listed

Performance
- LCP, CLS, FCP, TTFB from the Performance API

Technical
- Schema vs HTML drift detection (catches unresolved template variables like [year])
- Redirect chain
- X-Robots-Tag header check
- robots.txt and sitemap.xml presence

Copy for LLM
- One-click export of the full audit as clean markdown
- Ready to paste into Claude, ChatGPT, or any LLM to get fix recommendations

PRIVACY:
- No accounts, no signup
- No data collection, no tracking
- All analysis runs locally in your browser
- The extension reads the page you're on and shows the results to you only

Built by Kamila Olexa from Content Levers — content strategy and SEO resources for growth teams.
Homepage: https://contentlevers.xyz