Best Free & Open Source Alternatives to ChatGPT
Looking for a free or self-hosted alternative to ChatGPT? Below you'll find the best open source options — community-driven tools that let you own your data without vendor lock-in or recurring subscription costs.
Ollama
Get up and running with Llama 3.3, DeepSeek-R1, Phi-4, Gemma 3, Mistral Small 3.1 and other large language models.
Alternative to: 
ChatGPT
ChatGPT
Open WebUI
User-friendly AI Interface (Supports Ollama, OpenAI API, ...)
Alternative to: ChatGPT
ChatGPT
Lobe Chat
🤯 Lobe Chat - an open-source, modern design AI chat framework. Supports multiple AI providers (OpenAI / Claude 4 / Gemini / DeepSeek / Ollama / Qwen), Knowledge Base (file upload / RAG ), one click install MCP Marketplace and Artifacts / Thinking. One-click FREE deployment of your private AI Agent application.
Alternative to: ChatGPT
ChatGPT