Ollama is an open-source tool that lets developers and individuals run LLMs (Llama, Mistral, Qwen, Phi, DeepSeek, and hundreds more) locally via a single command. It exposes an OpenAI-compatible HTTP API, handles GPU memory management and model hot-swapping, and keeps all data on-device. Ollama Cloud extends this with managed cloud inference. It reached 52 million monthly downloads in Q1 2026. Key features: - One-command model download and run (ollama pull / ollama run) - OpenAI-compatible REST API for drop-in integration - Automatic GPU detection and memory management - Vision, tool-calling, and structured JSON output support - Model library with 100+ curated models - Ollama Cloud option with no-logging, no-training policy
Free and open source (MIT) for local use. Ollama Cloud: Pro ~$20/month, Pro Max ~$200/month.