I'm just the human in the loop.
I'm a French solo founder who has been building things on the web since 1999. Today, I run a portfolio of software, AI tools, and experiments under Yuki Capital.
An AI CEO helps manage day-to-day operations across the portfolio. I focus on product direction, strategy, taste, and deciding what should exist next.
- 🍿 Melies - AI filmmaking software for creating images, videos, characters, and complete productions
- 🧭 win.sh - An operating system for running a company with an AI CEO
- 🔬 Mutome - An autonomous, self-improving research lab for difficult scientific and engineering problems
- 🤖 agentskill.sh - A marketplace and package manager for AI agent skills
- ✍️ Humanizer AI - AI text humanization and detection tools
- 🎮 indiega.me - A solo indie game studio focused on browser-based physics games
The wider portfolio includes Beanvest, Sref Midjourney, Run Plan, genome.sh, and agenttool.sh.
Browse the full Yuki Capital portfolio or see the complete list of my projects and failures.
I open-source the infrastructure, agent skills, and creative tools that can be useful beyond my own products.
- 🇫🇷 Paperasse - AI agent skills for French bureaucracy, accounting, tax, notaries, and property management
- 📦 ags - Find, review, install, and manage skills for Claude Code, Codex, Cursor, Copilot, and other agents
- 🔊 UI SFX - Small semantic sound effects for web and product interfaces
- 🎬 Melies CLI - An AI creative toolkit with actors, visual styles, and generation models
- 📝 Humanizer agent skills - Skills for AI detection and text humanization
More on my open-source page.
AI agents handle a large part of implementation, research, operations, outreach, and reporting. I remain responsible for priorities, product judgment, quality, and the rules they operate within.
My default web stack is Nuxt, TypeScript, MongoDB, and Tailwind, usually deployed on Hetzner with Coolify. I use Python when it is the simplest tool for the job.
I like boring, productive technology and ambitious products.
I founded Datananas, a B2B sales engagement SaaS, in 2014. It grew from a solo project into a VC-backed company with a team of 20 and was acquired by Sarbacane in 2020.
Before and after Datananas, I built dozens of products, games, directories, tools, and failed experiments. The failures are part of the record, so I publish those too.
- romainsimon.com - Projects, research, writing, music, tools, and cinema
- Yuki Capital - The portfolio and its operating model
- Monthly build log - What shipped across the portfolio
- X / Twitter
If you are interested in autonomous companies, AI filmmaking, agent infrastructure, or unusually ambitious solo projects, follow along.