Doufu - Vibecoding your local web apps on your iPhone

Hi Product Hunt 👋 I’m App君, the maker of Doufu. I built Doufu because I wanted a simple way to “vibe code” small web apps directly on an iPhone—without setting up a dev environment, opening a laptop, or deploying anything just to test an idea. With Doufu, you can describe an idea in natural language, let an AI coding agent create or modify the local HTML/CSS/JS project, preview it instantly, edit files manually, restore checkpoints, and share the result as a `.doufu` / `.doufull` package. A few things I care about deeply: 1. **Local-first creation** — projects run locally on your iPhone. 2. **Bring your own model** — use Codex subscription, OpenAI-compatible APIs, Anthropic, Gemini, OpenRouter, or your own provider. 3. **Transparency** — Doufu is open source, and credentials are stored locally in Keychain. 4. **Tiny creative tools** — I want people to quickly make personal tools, prototypes, interactive notes, landing pages, toys, and experiments from anywhere. Doufu is still early, and I’d love your feedback: What would you build on your phone if making a small web app felt as easy as sending a message?