SEObolt SEO Checker (Chrome Extension)
16 KB on-page SEO audit. No account. Runs locally
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Jameson

SEObolt SEO Checker (Chrome Extension) - 16 KB on-page SEO audit. No account. Runs locally

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16 KB. That's the full install size. SEObolt SEO Checker is 60 to 300 times smaller than MozBar, SEOquake, SEO Minion, and every other major SEO extension on the Chrome Web Store. One click runs an instant on-page audit covering meta tags, Open Graph, Twitter Card, JSON-LD schema, heading hierarchy, image alt text and dimensions, and the internal/external link profile. Every check returns pass, warn, or fail with a specific fix. No account. No paywall. Runs entirely locally in your browser.

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Jameson
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Hey Product Hunt! I'm Jameson, solo dev at Royal Plugins. Install link first since I know that's what you want: https://chromewebstore.google.co... Real origin story: I was building the SEObolt SaaS platform and wanted a free Chrome companion so people could try the on-page audit before signing up for anything. So I went to install the leading SEO extensions to study what was already out there. MozBar weighs about 5 MB. SEOquake is around 1.5 MB. Most others sit in the 1-3 MB range. For a tool that mostly reads DOM properties and runs a few regex checks, that's wild. I ripped every dependency out, dropped the analytics SDKs, killed the toolbar UI, and rebuilt the core audit in vanilla JS. Final install size came in at 16 KB. Then I shipped it free with no account requirement, because asking someone to register for a 16 KB on-page audit would be insulting. What it actually checks on any page you visit: - Meta tags — title, description, canonical, robots, viewport, lang, charset - Social tags — Open Graph (og:title, og:image, og:url, og:type), Twitter Card - Schema markup — JSON-LD detection, type breakdown, missing required fields - Heading structure — H1 count, H1-H6 hierarchy, empty headings, order violations - Image audit — alt text presence, dimensions, file types, lazy-load attributes - Link profile — internal vs external counts, nofollow, sponsored, ugc, target="_blank" tallies - Per-check fix hints — every fail returns the specific spec or guideline it violates Runs entirely in your browser. No data leaves the page. Optional anonymous usage events only (toggleable). Companion to the SEObolt SaaS platform (https://seobolt.io) for rank tracking across Google plus LLM search (ChatGPT, Claude, Perplexity, Gemini, DeepSeek). That side is paid. This Chrome extension is free forever. What's the heaviest SEO extension still installed in your browser right now?