An open-source AI personal assistant. Chat with Claude, GPT, Gemini, DeepSeek, and 50+ models. Deploy background agents that run daily or weekly and notify you by email. Connect Gmail, Calendar, Notion, GitHub, Slack, and more. Branch conversations, search history, and export everything. Self-hostable with BYOK support.
OS Chat is a free, open-source alternative to T3 Chat and ChatGPT, a personal AI assistant that goes beyond simple chat. It unifies 50+ language models from OpenAI, Anthropic, Google, Meta, DeepSeek, xAI, and Mistral into a single, beautifully designed interface. Unlike traditional AI chat apps, OS Chat introduces background agents that work while you sleep. Schedule them to run once, daily, or weekly with timezone awareness, and receive email notifications when tasks complete. Deep integrations via Composio connect your entire digital workflow: Gmail, Google Calendar, Notion, GitHub, Slack, Linear, Google Drive, and more. The AI can read your emails, schedule events, manage repositories, and interact with your tools directly. Key features: - 50+ AI models with seamless switching mid-conversation - Background agents with scheduled execution and email alerts - Image generation (Flux, Imagen 4, GPT Image) - Real-time web search (Exa, Tavily, Brave) - Chat branching to explore alternative conversation paths - Full-text search across your entire chat history - Import/export for complete data portability - Reasoning model support with visible thinking process - BYOK (Bring Your Own Keys) support - Fully self-hostable Built with a modern stack: TanStack Start, React 19, Convex (real-time database), Vercel AI SDK v5, and Tailwind CSS. Open source: https://github.com/ajanraj/OpenChat