#1
OpenWebUI
Best UI / closest ChatGPT cloneMITSelf-host~65kChatGPT-clone UI that runs against Ollama or any OpenAI-compatible endpoint. Multi-user, RAG, model switcher.
github.com/open-webui/open-webuiAll best-of guides
AI chatbot · open-source ranking
Best Open-Source AI chatbots in 2026
ChatGPT costs $20/user/month and trains on your conversations. Open-source chatbots in 2026 run on your own hardware (or any cloud GPU), give you full data ownership, and can fine-tune on your domain.
#1 Pick — Best UI / closest ChatGPT clone
OpenWebUI
ChatGPT-clone UI that runs against Ollama or any OpenAI-compatible endpoint. Multi-user, RAG, model switcher.
github.com/open-webui/open-webuiAll 4 ranked
#2
LobeChat
Best aesthetic / pluginsMITSelf-host~50kPremium-looking chat UI with plugin ecosystem, voice synthesis, multi-model support. Beautiful.
github.com/lobehub/lobe-chat#3
Chatbot UI
Simplest to customize / forkMITSelf-host~30kSimple, ChatGPT-style React frontend. Easy to fork and customize for your own product.
github.com/mckaywrigley/chatbot-ui#4
HuggingFace Chat UI
Battle-tested at scaleApache-2.0Self-host~8kPowers HuggingChat. Production-grade, supports any Inference Endpoint or local model.
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