khoj-ai/khoj

Khoj is a self-hostable personal AI assistant that acts as a second brain, a single place to chat with AI models, search across your own documents, automate research tasks, and build custom AI agents. The core problem it addresses is that commercial AI assistants like ChatGPT only know what's in their training data: they cannot search your personal notes, PDFs, or work documents, and you cannot run them on your own hardware for privacy. Khoj bridges that gap. The system connects to a wide range of AI models, local models running on your machine through tools like Ollama, as well as cloud models like GPT, Claude, Gemini, or Llama, and lets you chat with whichever you prefer. Beyond plain conversation, Khoj indexes your documents (PDFs, Markdown files, Word documents, Notion pages, Obsidian vaults) and uses semantic search to find relevant passages before answering your question, so the AI can ground its answers in your actual files. You can create custom agents with a specific persona, a specific model, and a specific subset of your documents, essentially building a specialized assistant for different roles or projects. Scheduled automations let you set up recurring research tasks, for example, a daily briefing that searches the web, summarizes findings, and emails you a newsletter. Access is available through a web interface, a desktop app, a mobile app, Obsidian and Emacs plugins, and WhatsApp. You can self-host it on your own computer for complete privacy, or use the hosted cloud version at app.khoj.dev for a no-setup experience. You would use Khoj if you want an AI assistant that knows your personal knowledge base, respects your data privacy, and works with the AI model of your choice. It is a Python application, open-source under an open license, and deployable via Docker.