SHSelfHostIndex

FastChat vs Ollama

A side-by-side comparison of two self-hosted local llm runners options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
FA FastChat Platform for serving and evaluating large language models VS Ollama Run large language models locally with a simple CLI and API
FeatureFastChatOllama
Deploy effortUnder-an-hour setup≈5-minute setup
Health score69 · Good100 · Excellent
CategoryLocal LLM RunnersLocal LLM Runners
LicenseApache-2.0MIT
LanguagePythonGo
Setup difficultyHardEasy
Min. RAM8,192 MB8,192 MB
Deploymentdocker, sourcedocker, binary, bare-metal
GitHub stars★ 39,550★ 181,557
First released20232023
ReplacesOpenAI APIChatGPT, OpenAI API

What are FastChat and Ollama?

FastChat

FastChat is an open platform for training, serving, and evaluating large language model chatbots. It powers the Chatbot Arena and provides an OpenAI-compatible API server for self-hosted models.

  • OpenAI-compatible API
  • Web UI for model chat
  • Distributed serving
  • Model evaluation tools

Read the full FastChat guide →

Ollama

Ollama lets you download, run, and manage open large language models such as Llama, Mistral, Gemma, and Qwen on your own machine. It provides a simple command line interface and a built-in REST API so other tools can use local models.

  • One-command model downloads
  • OpenAI-compatible API
  • GPU and CPU support
  • Modelfile customization

Read the full Ollama guide →

FastChat vs Ollama: key differences

FastChat is written in Python, while Ollama is built with Go. Licensing differs — Apache-2.0 for FastChat versus MIT for Ollama. Ollama has the considerably larger community, at 181,557 GitHub stars versus 39,550.

Why pick each one

Choose FastChat if…

  • OpenAI-compatible API
  • Powers Chatbot Arena
  • Multi-model serving

Watch out for

  • GPU recommended
  • Steep learning curve
FastChat details

Choose Ollama if…

  • Extremely easy to set up
  • Large model library

Watch out for

  • Limited fine-grained inference tuning
Ollama details

Frequently asked questions

Is FastChat or Ollama better?

Ollama is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider FastChat if its specific feature set fits your needs better.

Are FastChat and Ollama free and open-source?

Yes. FastChat is licensed under Apache-2.0 and Ollama under MIT. Both can be self-hosted at no software cost.

Can I run FastChat and Ollama with Docker?

FastChat: yes. Ollama: yes.

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