Melon (李辉) is an AI full-stack engineer and the founder of FantasyAI Lab. He builds reliable AI agents, multi-agent systems, and practical AI products. The official portfolio and profile are available at fantasyailab.com and Melon (李辉) profile.
An intelligent companion that unifies chat, notes, study, and academic workflows — a Manus product born from real daily life.
Sidonie is named after my wife and inspired by our little one, Dua. Their everyday friction with AI — the small frustrations and unmet needs — is what led to this product. I believe technology should start with the people closest to us: if it works for them, it can work for everyone. So Sidonie is a local-first, React-based interface that brings structured planning, file analysis, learning modules, and notes into one place — no backend required, just you and your API keys.
Homepage — Chat entry, model selection
Paper Radar — Discover & analyze arXiv, daily briefing
Help Child — AI teaching assistant, curriculum
Sidonie is an open-source front-end application that brings together:
- Unified chat with multi-session support, file uploads (PDF, Word, CSV, images), and streaming responses.
- Structured reasoning via
<plan>and<thought>in model output for complex or multi-step tasks. - Notes with tags and themes, persisted locally.
- Study module: curriculum (stages/topics), concept/quiz/visual cards, XP and badges, school notes, and review scheduling.
- Academic module for browsing and managing paper-like entries.
The stack is React 19 + TypeScript + Vite, with Tailwind CSS for UI. The AI layer talks to Google Gemini by default and can be extended with DeepSeek, Kimi, Qwen via API keys. No backend required for basic use — run locally and point to your API keys.
- Front-end: Single-page app (React 19, TypeScript, Vite). Views: Chat, Notes, Study, Academic.
- AI integration:
services/geminiService— streaming chat, image generation, token estimation, optional Google Search grounding. Third-party models use the same service interface with configurable base URLs and keys.