I built a free SEO + AI-search (GEO) audit tool — no signup, no limits

A developer built a free SEO and generative engine optimization (GEO) audit tool called freeseoaudit.vercel.app. The tool performs over 40 checks across 8 categories, including GEO-specific checks for AI answer citations, and runs on free tiers using Next.js 15, React 19, Node, Express, and TypeScript. It requires no signup and has no crawl limits.

I kept hitting the same wall: every SEO tool either paywalls the useful parts or caps you at a few pages. So I built a free one — freeseoaudit.vercel.app . No signup, no crawl limit, open source. What it checks Paste any URL and it streams a report across 40+ checks in 8 categories: Why GEO/AEO? Search is splitting in two. Classic SEO gets you blue-link rankings; GEO Generative Engine Optimization gets you cited inside AI answers — ChatGPT, Perplexity, Google AI Overviews. The two now share under 20% of their winners. So it checks things most SEO tools ignore: llms.txt presence + spec conformance Stack Next.js 15 + React 19 on Vercel; Node + Express + TypeScript on Render. SSRF-hardened crawler, optional Playwright rendering, results streamed over SSE. Runs entirely on free tiers. Try it freeseoaudit.vercel.app https://freeseoaudit.vercel.app — paste your site and see. Free, stays free. Feedback very welcome, especially on the GEO checks — useful or gimmick?