Promptfoo — Test and Evaluate LLM Prompts

Promptfoo is an open-source evaluation framework for testing LLM prompt quality for AI development teams

Promptfoo is an open-source evaluation framework designed to test and secure the quality of Large Language Model prompts. This tool is built specifically for business owners, product managers, and engineering teams who need to move beyond subjective "vibe checks" when deploying AI features. By using representative test cases, Promptfoo allows teams to measure how changes in prompts or model versions impact output accuracy and safety. The platform provides a side-by-side comparison interface where you can view outputs from different models like GPT-4, Claude, and Gemini simultaneously. You can define custom grading criteria or use pre-built assertions to check for things like brand consistency, factual correctness, and the absence of toxic content. This systematic approach ensures that your AI applications remain reliable even as underlying models are updated throughout 2026. Business teams use Promptfoo to automate quality assurance within their existing development pipelines. Integrating this tool prevents regressions in customer-facing chatbots and ensures that marketing copy generators adhere to specific style guides. You can find more technical details and alternative testing frameworks on surfai.app to help scale your AI operations. Promptfoo is available as a free open-source library for individual developers and small teams. Enterprise versions are available for organizations requiring advanced security features, centralized experiment tracking, and dedicated support for large-scale deployments.

• Pricing: freemium

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