Build an Image Colorizer with Claude Code

Build an Image Colorizer web app. People search for "image colorizer" about 6,600 times a month, plus related searches like "colorize black white photos", "ai photo colorization", "old photo restoration". The goal is a tool that ranks for those searches and makes money.

What it should do:
Build an image colorizer web app. Create a homepage with upload area for black and white photos showing before/after examples. When users upload an image, display the original alongside the AI-colorized version with a slider comparison tool. Add manual touch-up tools for adjusting specific colors and saturation. Include historical period presets (1920s, 1940s, 1960s) for more accurate colorization. Show processing progress and download options in high resolution. Use warm, nostalgic colors with vintage-inspired design. Focus on the upload and colorization flow 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 MyHeritage AI, Colorize.cc, Photomyne do it and make ours simpler and faster.
3. Make it rank. Use "image colorizer" 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: /colorize-[photo-era]-photos, /photo-colorizer-for-[use-case], /restore-[photo-type]-images.
4. Monetisation: Freemium: 3 colorizations/day, $9/mo unlimited + HD quality. 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.