I built a free SEO audit Chrome extension — 40+ features, 100% local, no paywall

#webdev #seo #chromeextension #javascript

RankForge audits any webpage for SEO in your Chrome side panel. No account, no API key, no data leaves your machine. Free.

👉 https://chromewebstore.google.com/detail/rankforge/eapanmoadjlignenfhpiljfijbjlopdd

Why I Built It

I kept reaching for SEO tools mid-development and every option was either paywalled, slow (server-side crawl), or privacy-invasive. I wanted something that worked like DevTools — instant, local, always there.

What It Does

Open any webpage → open the side panel → click Re-Scan.

Score breakdown (0–100)

Category	What it covers
Technical	Meta tags, headings, schema, indexing, URL
Content	Word count, readability, keywords, images
Performance	LCP, FCP, CLS, mobile
Social	OG tags, Twitter Card, SERP preview

Features

✓ Meta tag visualizer + copy-to-clipboard
✓ H1–H6 heading tree
✓ Schema / JSON-LD viewer
✓ Keyword density & readability
✓ Image audit with alt-text status
✓ Real Core Web Vitals (LCP, FCP, CLS)
✓ Competitor compare (any URL, side-by-side)
✓ Tech stack detection
✓ Site crawl (50 pages, browser-side)
✓ Export: PDF, CSV, JSON, Markdown
✓ Scan history

Tech Stack

React + TypeScript + Vite
Tailwind CSS
Chrome Manifest V3 + Side Panel API
Zero external API calls

The Privacy Part

RankForge injects a script into the active tab only when you click Re-Scan, reads the DOM, returns results to the panel. Nothing hits an external server. Ever.