App.build has transitioned from a managed service to an open-source platform, enabling users to generate complete applications locally using open weights language models (LLMs) via tools like Ollama, LMStudio, and OpenRouter, thus eliminating cloud API dependencies and associated costs. Running app.build locally offers benefits such as avoiding API costs and rate limits, ensuring data privacy, and contributing to the open-source ecosystem, while also allowing for experimentation and development in personal homelabs. Although open-source models for local inference are improving and becoming more cost-effective, they still lag behind closed models in performance, particularly for complex tasks required by app.build. The platform encourages users to explore its source code and contribute to its development, with the ultimate goal of providing a viable local alternative to cloud-based APIs.