Open Tools

Five free SEO and AI-visibility tools that run entirely in the browser.

visibility100x.github.io

No account, no upload, no server. Your input never leaves the tab, because there is nowhere for it to go — the site is static files, and every page carries a meter that counts its own outbound calls and reads zero.

Tool	What you leave with
SEO ROI calculator	Payback month, return multiple, break-even traffic
Content calendar generator	A dated editorial calendar as .xlsx or CSV
Competitor analysis template	A weighted, ranked scorecard as .xlsx or CSV
SERP snippet preview	Pixel-measured title and description, with the truncation point
llms.txt generator	A valid llms.txt for the root of your domain

Why these five, and not a URL checker

A page served from one origin cannot fetch another origin and read the response. The same-origin policy forbids it, and that rule is the reason a web page you open cannot quietly read your logged-in webmail. So a "browser-based site checker" either runs the fetch on a server or does not work.

Which leaves one shape that genuinely fits a static host: tools that transform input you already have into an artifact you take away. That is what these are, and it is the constraint every addition has to satisfy.

The URL-fetching checks are free too, but they need a backend, so they run on visibility100x.com — the split is explained here.

Development

npm install
npm run dev      # local dev server
npm run build    # static build into dist/
npm run preview  # serve the built site
npm run og       # regenerate public/og.png (needs a local Chromium)

Astro, no UI framework, no runtime dependencies. Pushing to main builds and deploys through .github/workflows/deploy.yml.

Layout

src/
  config/     site constants, the tool registry, the checker registry
  layouts/    Base (head, schema, nav, footer) and ToolPage (hero, FAQ, related)
  components/ Nav, Footer, NetMeter
  lib/        export.ts — CSV, a hand-rolled .xlsx writer, downloads
  pages/      one file per route; each tool is a single self-contained page
  styles/     global.css — all design tokens
public/
  fonts/      IBM Plex, self-hosted so no font CDN is contacted

The .xlsx writer in src/lib/export.ts builds the workbook zip by hand with STORE and no dependencies, so spreadsheets are assembled in the tab rather than on a server. Verified against Excel, LibreOffice, Numbers, Sheets and openpyxl.

Contributing

These tools embed assumptions — click-through rates by position, observed SERP truncation widths, llms.txt adoption. Some will drift and some may be wrong. If you can show that one is, open an issue; a correction with a source beats a defence.

Licence

MIT. See LICENSE.