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daan

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Daan is a stripped-back chat window that works with OpenAI models and other services that speak the same way, and it can reach outside tools through the standard connection. You can save reusable characters with their own instructions, pin conversations worth keeping, switch to a dark theme, and turn a favourite setup into a small window of its own. Your key is kept in your browser rather than on someone else's machine. Free for personal use. The code has not changed since November 2025.

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Use This MCP client To

Chat using my own key instead of a monthly subscription Save a reusable persona for a task I repeat weekly Keep an important conversation pinned and easy to find Turn a favourite setup into a small standalone window Try a model in the browser without installing anything

README

Daan Logo

Dáàn

A Lightweight Language Model Client

English | 中文

Daan (答案, "Answer" in Chinese) is a concise and lightweight client for interacting with Large Language Models (LLMs), offering a smooth and efficient AI experience. It's compatible with OpenAI's GPT series and other OpenAI-compatible APIs.

正在支持使用 AI 在 Daan 内生成并运行 JS App 和 MCP服务，让 AI 工具化变得轻而易举，敬请期待！

Try the Demo

Key Features

  • 🆕 Miniapp Functionality: Convert your frequently used features directly into a mini-app for use in a mini-window.

  • 🆕 Miniapp and Character Market: Publish your presets to GitHub issues and install/reuse them in Daan with one click.

  • 🆕 Miniapp as MCP Service: Miniapps also support running as MCP services, enabling low-threshold development of simple MCP servers.

  • ✨ Minimalist Interface: Focus on the conversation, not clutter.

  • 🔌 MCP (Model Context Protocol): Enhance AI responses with external tools and knowledge.

  • 👤 Character Customization: Create and reuse chat personas with specific prompts and settings.

  • 🔄 Flexible Model Selection: Easily switch between OpenAI models or add custom ones.

  • 🔑 Custom API Endpoints: Use alternative OpenAI-compatible API services.

  • 🔒 Secure Local Storage: API keys are stored securely in your browser.

  • ⚙️ Personalization: Customize system prompts, history length, and more.

  • 🎨 Theme Switching: Includes a dark mode for eye comfort.

  • ⏱️ Timestamps: Track conversation history easily.

  • 📝 Chat Summary: Quickly review conversation topics.

  • 📊 Token Estimation: Monitor message token usage.

  • 📌 Conversation Pinning: Keep important chats accessible.

Screenshots

MCP Feature Character Customization Miniapp Market Dark Mode Light Mode

Quick Start

  1. Install Daan: Go to Online Demo or deploy/install Daan locally.
  2. Get API Key: Obtain an API key from OpenAI or a compatible service.
  3. Configure Daan: Enter your API key in Daan's settings. Select your desired model.
  4. Start Chatting: Click "+ New Chat" and begin your conversation!

Contribution

Contributions are welcome! Feel free to:

  • Submit an Issue to report bugs or suggest features.
  • Submit a Pull Request to fix bugs or add functionality.
  • Participate in Discussions to share your ideas.

License

Daan is licensed under the AGPL-3.0. See the LICENSE file for details.

  • Non-commercial use: Free.
  • Commercial use: Requires free authorization (registration needed).

daan FAQ

Is it still being updated?
The code has had no changes since November 2025, though the hosted demo is still online and usable.
Do I need a paid key?
Yes. You bring your own key from OpenAI or a compatible service, and it is stored in your browser rather than sent to the maker.
Can I use this to run outside tools alongside my chat?
Yes. It connects to tool providers, which is how it reaches things the model alone cannot do.
Do I have to install anything?
No. There is a hosted demo you can open in a browser, and you can run your own copy if you would rather.
Is it free?
Free for personal use. Commercial use needs a free authorisation from the author, which means registering first.
How hard is setup?
Open it, paste your key into settings, choose a model, and start a chat.