Build a TikTok Caption Generator with Claude Code

Build a TikTok Caption Generator web app. People search for "tiktok caption generator" about 1,900 times a month, plus related searches like "tiktok caption ideas", "viral tiktok captions", "tiktok hashtag generator". The goal is a tool that ranks for those searches and makes money.

What it should do:
Build a TikTok caption generator web app. Create a homepage with video topic input and trending category selector (Dance, Comedy, Education, etc.). When users generate, show multiple caption variations with emoji integration and trending hashtags. Add tone options (funny, inspirational, educational) and length preferences (short, medium, long). Include viral caption templates and hashtag research tools. Show engagement predictions and copy buttons for each suggestion. Use TikTok-inspired black and pink branding with dynamic animations. Focus on caption generation and hashtag suggestions 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 Later, Hootsuite, All Hashtag do it and make ours simpler and faster.
3. Make it rank. Use "tiktok caption generator" 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: /tiktok-captions-for-[niche], /viral-tiktok-hashtags-[topic], /tiktok-content-ideas-[industry].
4. Monetisation: Freemium: 20 captions/day, $5/mo unlimited + trend insights. 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.