On-Page SEO Analyzer

A self-hosted tool for auditing and improving on-page SEO. It crawls pages with Firecrawl and measures 74 SEO metrics on each one through DataForSEO, and it can take on up to 500 pages in a single run. Core Web Vitals scores for LCP, FID and CLS are included, and a live progress view shows the audit as it runs. The code is MIT licensed, open source and free to use, written in TypeScript with a client and a server that start together from one command. Settings and API keys go in an environment file or the app's settings page, and the server exposes endpoints, including a progress stream, that the interface uses. It is also tagged as a Claude Code skill, which makes it a fit for developers and marketers comfortable running a local project.