Open WebUI
Self-hosted AI interface — Ollama, OpenAI-compatible, RAG built-in.
BSD-3-Clause alternative to ChatGPT with multi-model support, code execution, file upload, and RBAC. Single Docker command to deploy.
LobeChat
Open-source AI chat — plugin ecosystem, multi-model, voice chat.
Apache-2.0 alternative to ChatGPT with GPT-4, Claude, Gemini, and Ollama support. Material Design UI, DALL-E/Flux image generation, and TTS/STT.
AnythingLLM
All-in-one AI app — chat with documents using any LLM, fully private.
MIT-licensed platform for multi-LLM document chat, AI agents, and multi-user workspaces. Desktop apps for Mac, Windows, Linux with LanceDB, Chroma, or Qdrant backends.
Cherry Studio
Multi-model AI desktop client — local-first privacy, native apps.
AGPL-3.0 desktop client for GPT-4, Claude, Gemini, DeepSeek, and Ollama. Beautiful native UI with conversation management and model comparison.
Jan
Offline AI assistant — run LLMs locally, no data leaves your machine.
Apache-2.0 desktop app for Llama, Mistral, Gemma models in GGUF format. Native Mac, Windows, Linux with conversation history and code highlighting.
FastGPT
AI knowledge base platform — visual workflows and built-in RAG.
Apache-2.0 alternative to Dify with drag-and-drop workflow builder, document ingestion, and one-click API deployment. MongoDB + PostgreSQL backend.
Compare ChatGPT alternatives
| Tool | Stars | Forks | License | Self-hosted |
|---|---|---|---|---|
| Open WebUI | 139.6K | 20K | BSD-3-Clause | Yes |
| LobeChat | 78.1K | 15.4K | Apache-2.0 | Yes |
| AnythingLLM | 60.9K | 6.6K | MIT | Yes |
| Cherry Studio | 46.7K | 4.4K | AGPL-3.0 | Yes |
| Jan | 42.8K | 2.9K | Apache-2.0 | Yes |
| FastGPT | 28.2K | 7.1K | Apache-2.0 | Yes |
ChatGPT is OpenAI's proprietary, cloud-hosted AI chat assistant. It's convenient and continuously updated, but every conversation runs through OpenAI's servers, usage is metered or subscription-gated, and you can't run it offline or swap in a different model.
Open-source alternatives let you chat with AI models locally or self-hosted, with full control over which model you run and where your data goes. Jan and AnythingLLM are the strongest picks if fully offline, private use is the priority. Open WebUI, LobeChat, and Cherry Studio work well if you also want to connect to hosted model APIs, not just local ones.
The main tradeoff versus ChatGPT is model quality and setup effort: local models require a capable machine (or GPU) to match ChatGPT's response quality, while hosted-API modes give you similar quality but you still pay per token to a model provider.
FAQ
Is there a free, open-source alternative to ChatGPT?
Yes. Open WebUI, Jan, and AnythingLLM are open source and free to self-host. Running local models is free beyond your own hardware; connecting to a hosted model API still incurs usage costs.
What's the best open-source alternative to ChatGPT?
Open WebUI is the most flexible pick, supporting both local and cloud models. Jan and AnythingLLM are stronger picks if fully offline, private use is the priority.
Can I run an open-source ChatGPT alternative without an internet connection?
Yes. Jan and AnythingLLM are designed to run local LLMs entirely offline, at the cost of needing sufficient local compute for good performance.
What are the top open-source alternatives to ChatGPT?
Browse all open-source alternatives to ChatGPT above, or explore the full AI & LLM category for more options.