Build a Meta Tag Analyzer with Claude Code

Build a Meta Tag Analyzer web app. People search for "meta tag analyzer" about 700 times a month, plus related searches like "meta tag checker", "seo meta analyzer", "meta description checker". The goal is a tool that ranks for those searches and makes money.

What it should do:
Build a meta tag analyzer with URL input and comprehensive tag extraction. Analyze title tags, meta descriptions, keywords, and social meta tags. Show character counts, optimization scores, and improvement suggestions. Include SERP preview and competitor comparison. Focus on getting tag extraction and analysis working first.

How to build it:
1. Read this folder first. If it is empty, set up Next.js (App Router, TypeScript, Tailwind). Write a short PLAN.md with the pages, components, any library or API you need, and what you are leaving for later. Then build.
2. Put the tool itself on the homepage so a visitor can use it within seconds, with no sign-up. Do the processing in the browser where you can, so it is fast and cheap to run. Look at how Screaming Frog, SEMrush, Ahrefs do it and make ours simpler and faster.
3. Make it rank. Use "meta tag analyzer" in the title tag, H1 and meta description. Under the tool, add a short how-to and an FAQ with FAQPage schema, and add a sitemap and robots.txt. Scaffold these programmatic pages from one template and a data file: /meta-tag-analyzer-[cms], /seo-meta-checker-[industry], /meta-description-[page-type].
4. Monetisation: Freemium: 10 analyses/day, $12/mo unlimited + bulk checking. Add a pricing page and the free usage limit, and leave Stripe checkout as a clearly marked stub with the environment variables it needs.
5. Run it locally and test the main flow end to end, including edge cases like empty input and very large files. Fix what breaks, then finish with a summary of what works, what is stubbed and how to deploy it to Vercel.

Paste it into Claude Code in an empty folder. It plans first, so read PLAN.md and steer before it starts building.