SEO Audit Kit: On-Page Checker & Audit

On-page SEO checks that run in your browser. Pay once, no subscription, no account.

SEO Audit Kit runs a complete on-page SEO audit on any page you are viewing, right in your browser. No account, no login, no subscription. You pay once and own it. Everything runs locally. The content of the pages you audit never leaves your machine: there is no backend, and nothing is uploaded anywhere. FREE, and always functional: - On-page overview: title tag, meta description, canonical, meta robots, language, Open Graph and Twitter card data, word count. - Heading structure: a full H1 to H6 outline with warnings for missing or duplicate H1s and skipped levels. - Images: alt-text coverage and dimensions, so you can spot images that hurt accessibility and SEO. - Links: internal vs external counts, anchor text, and nofollow detection. - SERP snippet preview: see how your title and description render in Google on desktop and mobile, with truncation warnings before you publish. PRO, a single one-time purchase (no subscription): - Broken link checker: checks every link on the page and reports the status of each one, so you can fix dead links before they cost you rankings. - Hreflang validator: detects hreflang annotations, validates locale codes, and catches canonical conflicts on international pages. - Structured data validator: checks JSON-LD and microdata against rich-result requirements. - Internal link map: shows how a page distributes internal links, grouped by section, with anchor text. - Export every report to CSV or JSON. WHY PAY ONCE: Most SEO extensions now lock their useful features behind a monthly subscription or a bundled plan you do not want. If you have ever opened a familiar SEO tool only to hit a paywall, this is for you. SEO Audit Kit is a one-time purchase. Buy it once, use it forever, on every site you work on. PRIVACY: Your audits stay on your device. The only data that ever leaves your browser is an anonymous license check (ExtensionPay, our payment provider) and a small set of anonymous usage events (Plausible Analytics) that you can turn off in the options page at any time. No page content, no browsing history, no personal data, no ads. Full policy: https://seoauditkit.mongooselabs.dev/privacy/ Works in Google Chrome and other Chromium-based browsers. Built by Mongoose Labs. Questions or feedback: support@mongooselabs.dev.