Frontier tech for the next decade of human-computer interaction.
We build software that talks back, listens, and acts on what it hears, instead of asking humans to translate themselves into clicks and typing.
What comes after the form.
Yujin works on the boundary where AI meets the user interface. The interfaces we ship today still assume a human in front of a screen filling fields. We design for a world where agents, voice runners, accessibility tools and humans drive the same surface through the same contract.
Urazuke 裏付け -- the evidence method for building software with AI
A method for building production-grade software with an AI agent without the project owner reading a single line of code: the owner decides and verifies evidence, the model builds. Twenty-four steps in four stretches, each with a contract (context, English prompts, expected result, completeness check, warning signs), a course with hands-on tasks up to deployment, and all of it in eight languages. Distilled from three real systems in production, hard knocks included. Tool-neutral: Claude Code, Cursor, Codex, Gemini CLI or Forge.
Yujin Forge -- voice-first NAC3 dev framework
The dev tool that turns a Claude or OpenAI or Gemini key into a working NAC3 React app: CLI + browser chat panel + voice loop + spec ingest from ten document formats. Bring your own LLM key, multi-provider routing, end-to-end encrypted key sync between desktop and a mobile companion. $10/month, cancel anytime. Implements the Urazuke method end to end: the 24-step ladder with mechanical gates, each step prompt injected into the chat, evidence receipts and the honest report.
NAC3 -- Native Agent Contract
An open standard that lets any web UI be driven by AI agents, voice assistants, screen readers, RPA bots, and Playwright specs -- through the same contract. Five HTML attributes. No SDK lock-in. Free to use, free to fork.
Tambien construimos.
Yuemail (correo por voz para accesibilidad), NAC3 Kikoe (comandos de voz locales para habla atipica), una guia para construir agentes RAG, y dos demos de compra via NAC3: un script y un agente de IA comprando zapatillas. Ver los casos de uso →