Dualmark

Open-source infrastructure for answer engine optimization in which every page is dual-marked: a Markdown twin for AI agents sits beside the HTML for humans, and HTTP content negotiation picks which one gets served. Every HTML response advertises its twin through a Link header with a text/markdown alternate, so a crawler such as ChatGPT sees clean Markdown while existing pages stay unchanged and browsers still get HTML. Quickstarts take 30 to 60 seconds for Astro, the Next.js App Router, SvelteKit, Cloudflare Workers, Deno Deploy and Vercel Edge. Built-in converters transform pages, an onAIRequest hook with a Cloudflare Analytics Engine integration records bot name, vendor, page, tokens and country, and any site can be verified against the spec. Apache-2.0 licensed and written in TypeScript.