promptfoo: what it is, what problem it solves & why it's gaining traction

What it solves

Promptfoo replaces the trial-and-error approach to prompt engineering by providing a systematic way to evaluate and red-team LLM applications. It helps developers ensure their AI apps are secure, reliable, and high-performing before shipping to production.

How it works

Promptfoo is a CLI and library that allows developers to test prompts and models side-by-side. It automates the evaluation of LLM outputs against specific metrics and can be integrated into CI/CD pipelines for automated checks. It also includes vulnerability scanning to identify security risks through red teaming.

Who it’s for

It is designed for developers building LLM-powered applications who need a data-driven way to compare models (such as OpenAI, Anthropic, Azure, Bedrock, and Ollama) and validate security and compliance.

Highlights

• Automated Evaluations: Test and compare prompts and models side-by-side using a matrix view.
• Red Teaming: Scan for security vulnerabilities and generate vulnerability reports.
• CI/CD Integration: Automate LLM checks within development workflows.
• Local Execution: Evals run locally, ensuring prompts remain private.
• Broad Compatibility: Works with any LLM API or programming language.