Running Local AI Models in .NET with Ollama (Step-by-Step Guide)

Most developers who start experimenting with AI tend to follow the same path. You integrate a cloud AI API into your application. The prototype works beautifully. Responses are fast, integration is simple, and everything feels almost magical. Then the production questions start appearing. How much will this cost at scale? Do we really want sensitive data leaving our infrastructure? What happens if the API rate limits us? And the big one many developers eventually ask: Can we run AI models locally instead? The answer is yes. And tools like Ollama make it much easier than most developers expect. Ollama allows you to run powerful language models directly on your machine and access them through a simple HTTP API. This means you can integrate local AI into ASP.NET Core APIs, background services, or internal tools without relying on external providers. In this guide we will walk through: why local AI models are becoming popular how Ollama works how to run models locally how to call Ollama fr