What Is Ollama?

Running Models Locally

Ollama is a free, open-source application that downloads open-weights language models and runs them on your own machine. No cloud account, no API key, and no uploaded data: everything stays on your computer.

Why Developers Like It

• Free to run - Pay for hardware, not tokens.
• Private - Your prompts never leave the machine.
• Offline capable - Works without internet after download.
• One command - ollama run starts a model instantly.

What It Provides

Ollama bundles a model runner, a small registry of ready-made models, a command line tool, and a local HTTP API. It also exposes an OpenAI-compatible endpoint, so many existing tools work with it unchanged.

The Model Library

Hundreds of open models are listed in the Ollama library with tags such as llama3.2, qwen2.5 and mistral. Each tag maps to a specific size and quantization level.

Key Points

• Ollama runs open-weight models locally.
• No account, key, or cloud upload required.
• Includes a CLI, HTTP API and OpenAI-compatible endpoint.
• It is the easiest way to experiment with local LLMs.