# Promptfoo

> Open-source CLI and library for testing and evaluating LLM prompts.

Promptfoo is an open-source framework for evaluating, testing, and red-teaming LLM applications that helps AI developers systematically measure prompt quality, detect regressions, and identify safety vulnerabilities before deployment. It supports automated testing across multiple LLM providers simultaneously, comparison of different model versions, and adversarial probing for jailbreaks and harmful outputs. AI engineering teams use Promptfoo as their CI/CD layer for prompt engineering — ensuring that every change to prompts or models is rigorously evaluated before reaching production users.

## Quick facts

- Categories: Developer Tools, QA
- Pricing: Free
- Free plan: Yes
- Official site: https://promptfoo.dev
- Last checked: 2026-10-23

## Key features

- LLM testing and evaluation framework
- Red teaming and adversarial testing
- Prompt injection testing
- Automated CI/CD testing
- Multiple provider support
- Open-source tool

## Use cases

- Testing LLM application security
- Evaluating prompt robustness
- Red teaming AI applications
- Automated AI quality assurance

## Links

- Nextool.ai page: https://nextool.ai/tools/promptfoo/
- Alternatives: https://nextool.ai/alternatives/promptfoo/

Source: Nextool.ai (https://nextool.ai/tools/promptfoo/). Pricing and features change; confirm on the provider's site before relying on them.