On-Page SEO Analyzer — SEO-аудит сайта

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On-Page SEO Analyzer is an open-source on-page SEO audit tool that crawls up to 500 pages and evaluates 74 SEO metrics per page, including Core Web Vitals (LCP, FID, CLS). Reach for it when you need to diagnose why a site isn't ranking, when you want a full technical SEO snapshot without manually checking pages one by one, or when you need to export audit results as CSV or JSON to share with a team. The stack is React 19 + TypeScript + Vite + TanStack Router + Tailwind CSS with Shadcn/ui on the frontend, and Node.js + Express + SQLite on the backend. Page discovery relies on the Firecrawl API; SEO analysis uses the DataForSEO API — both API keys are required before the tool will run. Audit progress streams in real time via SSE. Run locally with npm run dev (Node.js 18+); production build via npm run build. The focus is auditing existing pages and surfacing issues, not generating content or building backlinks. It suits SEO professionals and developers who want a self-hosted alternative to SaaS audit platforms; not a fit if you don't have Firecrawl and DataForSEO accounts.