hifumi · 一二三 · hi-fu-mi

Build Rails apps from a chat prompt.

Describe the app — hifumi plans revisions, drives LLM through implement → verify → commit, and hands you a clean Rails repo. Bring your own OpenRouter key. No vendor lock-in.

一

hi · 01 · describe

You describe the app

Type a sentence — “a flower shop with checkout,” or paste a 200-line spec. Hifumi asks for clarifications, then plans the work as a sequence of small, named revisions.

二

fu · 02 · build

Hifumi builds, revision by revision

A Roast workflow drives AI through implement → verify → commit on a real Rails repo. Each revision is one atomic git commit you own.

三

mi · 03 · run

You run the result

Preview the app in a hardened Docker container at <id>.preview.hifumi.dev. Clone the repo, take it elsewhere — your dependencies, your git history.

Rails Way first
convention over configuration
Deliver a clean Rails repo, no SaaS theatre.