Promptfoo

What is Promptfoo?

Promptfoo is an open-source LLM evaluation framework designed to test and validate language model applications during development. The tool enables developers and organizations to systematically evaluate prompt performance, identify vulnerabilities, and implement red teaming exercises before deployment. The platform serves developers, AI engineers, and security teams who need to ensure their LLM applications perform reliably across different scenarios. Promptfoo provides automated testing capabilities to catch potential issues early in the development cycle, supporting quality assurance for AI-powered features and products. Key capabilities include running comparative evaluations across multiple prompts and models, testing against adversarial inputs, and generating detailed reports on model behavior and safety. The framework integrates into development workflows and supports various LLM providers, making it adaptable to different project requirements. As an open-source project, Promptfoo is freely available and maintained on GitHub, allowing teams to customize the tool for their specific needs. The platform has gained adoption among enterprise organizations and individual developers seeking structured approaches to LLM evaluation and security testing. It addresses the growing need for systematic validation practices as language models become more prevalent in production applications.