iSEO Lens

Live on-page SEO linting in a side panel — auto-checks every page you visit, even localhost & staging. Runs 100% locally.

iSEO Lens — live, private on-page SEO in a side panel. iSEO Lens is a DevTools-style side panel that lints the SEO of every page you visit — automatically, as you browse. Open it once and it stays with you: each time you navigate (including single-page-app route changes) it re-checks the current page. No "paste a URL and click check." Everything runs locally in your browser. Nothing about the pages you visit is ever sent to a server — so it also works on pages public SEO tools can't reach: localhost, staging, and anything behind a login. THREE TABS • On-Page — ~22 SEO & accessibility checks: title, meta description & robots, canonical, Open Graph / Twitter, headings, image alt text, JSON-LD, hreflang, HTTPS, viewport, response status and security headers, and more. Click a count to jump straight to the first error or warning. • RobotsReader — decodes the site's robots.txt into plain language, naming each crawler (Googlebot, GPTBot, ClaudeBot, CCBot, and more) and showing exactly what's allowed or blocked. Raw view included. • Validate Sitemap(s) — fetches the sitemap tree (follows index files, gunzips .gz) and flags problems: URLs blocked by robots.txt, duplicates, http-not-https, host mismatch, protocol limits (50,000 URLs / 50MB per sitemap), and more — pointing you to the exact sitemap file to fix. PRIVATE BY DESIGN • 100% client-side — page content is analyzed on your device and never transmitted. • Reads only SEO markup and response headers — never your form fields, passwords, cookies, or other tabs. • Host access is requested at runtime (not at install) and can be revoked anytime. Open it with the toolbar icon or Ctrl/⌘+Shift+S. Powered by iSEO (iseo.genai.io.vn).