I Built a Free AI Second Brain (Antigravity + Obsidian)

In this video I show you how to build a personal AI knowledge system using Antigravity and Obsidian — completely free. No paid tools, no complex databases, no code. Just two free apps that work together to organize everything you know and make it queryable. This method is based on Andrej Karpathy's LLM Wiki concept — where instead of a vector database, you use simple markdown files that your AI reads, organizes, and builds relationships between automatically. What we build: → A vault in Obsidian to visually navigate your knowledge → A Raw and Wiki folder structure → Web Clipper to pull articles directly into your vault → Antigravity to ingest and organize everything automatically 🔗 Tools used: → Antigravity (Free) — antigravity.ai → Obsidian (Free) — obsidian.md → Obsidian Web Clipper (Free Chrome Extension) → Karpathy's LLM Wiki Gist — (link) If this helped you, like and subscribe. Next video we're connecting this system to an AI agent. #BuildWithKed AI second brain, Obsidian AI, Antigravity AI, free AI tools, LLM wiki, Karpathy LLM knowledge base, Claude Code alternative, AI knowledge system, Obsidian automation, AI for beginners, build with AI, AI workflow 2026, free AI workflow, personal knowledge management, AI pkm