Promptfoo
Promptfoo is an open-source framework for testing and evaluating large language model (LLM) prompts, chains, and agents. It enables developers to systematically compare outputs from different models, prompts, or configurations to ensure reliability, quality, and cost-effectiveness. The tool supports automated testing, benchmarking, and continuous integration workflows for AI applications.
Developers should use Promptfoo when building LLM-powered applications to validate prompt performance, detect regressions, and optimize for accuracy and consistency across model updates. It is essential for use cases like chatbots, content generation, and data extraction where prompt engineering directly impacts user experience and operational costs, helping teams maintain high-quality outputs in production environments.