WebCheck360: On-Page SEO Audit

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.