WebCheck360: On-Page SEO Audit
Extension Actions
- Extension status: Featured
Analyze 160+ on-page signals instantly. Meta tags, schema, links, security headers, readability. Free, runs locally, no tracking.
Built by a freelance developer who got tired of bloated, expensive SEO tools.
After juggling multiple extensions that demanded subscriptions, collected data, or crashed browsers with bloat, I built WebCheck360. One tool that analyzes any website instantly, runs entirely in your browser, and respects your privacy.
WHY IT EXISTS
- 86KB total size, runs instantly with no API calls
- 160+ on-page signals checked in seconds
- 100% local processing, your data never leaves your browser
- Free forever, no accounts, no premium tiers
WHAT IT CHECKS
Meta & Titles
Title tag length, meta descriptions, canonical URLs, robots directives, viewport settings, SERP preview.
Headings
H1-H6 distribution, hierarchy validation, duplicate detection, skip-level warnings.
Images
Alt text coverage, lazy loading, responsive attributes, dimension analysis.
Links
Internal vs external ratios, anchor text quality, nofollow distribution, security attributes.
Keywords
Keyword density, 2-4 word phrase analysis, long-tail keyword detection.
Social Tags
Open Graph validation, Twitter Cards, image dimensions for sharing.
Structured Data
JSON-LD, Microdata, RDFa detection. Schema checks for Organization, LocalBusiness, Article, Breadcrumbs.
Local Signals
NAP consistency, geographic mentions, business hours schema, map embeds.
Technical
HTTPS, security headers (CSP, X-Frame-Options), sitemap detection, robots.txt analysis.
International
Hreflang tag validation and implementation checks.
Readability
Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, sentence and paragraph metrics.
Accessibility
Alt text, semantic landmarks, skip links, form labels, ARIA attributes, color contrast.
Resources
Scripts, stylesheets, images, fonts inventory with third-party tracking detection.
FEATURES
- Opportunities tab with prioritized recommendations
- Tools directory linking to PageSpeed Insights, Search Console, and more
- Dark mode
CUSTOMISATION
Adjust scoring weights for each category. Set thresholds for title length, description length, keyword density, readability scores. Save and reuse configurations.
EXPORT
CSV for spreadsheets, JSON for developer workflows.
WHO IT'S FOR
- Freelancers running quick client audits.
- Agencies standardising checks across teams.
- Developers catching issues before deployment.
- In-house teams monitoring site health.
PRIVACY
No accounts. No tracking. No data collection. Everything runs locally.
FOCUSED ON WHAT YOU CAN CONTROL
No vanity metrics. No made-up authority scores. Just on-page factors you can actually see, verify, and fix.
GET STARTED
Click Add to Chrome. Visit any page. Click the icon. Done.
Latest reviews
- Mohammed Ali Khowaja
- TLDR: A recommended tool for my colleagues in the web development industry! I've been using this for a few weeks now and it's become part of my daily workflow. Covers pretty much everything I need to check - meta tags, heading structure, schema markup, internal links, all the technical stuff. The best part is it's actually fast and doesn't send my data anywhere. I was sceptical at first but it really does run everything locally. No subscription is a huge plus since I already pay for too many SEO tools. The customizable scoring is helpful since I can adjust it based on whether I'm auditing an e-commerce site vs a blog. Export to CSV works great for client reports. UI is clean and well-organized too, which is refreshing compared to most extensions out there. For a free tool that does this much, it's refreshing. Way better than juggling 5 different extensions.