Build log: turning photos into printable coloring pages with Seedream on Cloudflare Workers

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I've been building CrayonInk, a small web app that turns a photo into a black-and-white coloring page you can print at home. Upload a picture of your dog, your grandparents, a wedding photo, and get back a page with clean, closed outlines that's ready for crayons. The idea isn't new. This post is about the engineering: the pipeline, a model comparison with per-call billing data, the prompt changes that mattered, and the cost guardrails I added before letting strangers spend my inference budget. All of it runs on Cloudflare: Next.js 16 deployed to Workers via @opennextjs/cloudflare D1 for jobs,

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