Vellum is a developer platform that simplifies the process of deploying language model-powered (LLM) applications in production. With features like side-by-side comparison, a simple API interface, and the ability to track results and test changes, Vellum empowers developers to confidently optimize their prompts and models. By providing tools for rapid experimentation, regression testing, version control, and observability, Vellum streamlines the transition from prototype to production, allowing developers to focus on delivering a great user experience with AI-powered features.