Promptfoo
Open-source framework for evaluating and securing large language models.
Pricing
Free tier
Flat rate
Adoption
↗RisingLicense
Open Source
Data freshness
Verified · Jul 16, 2026Overview
What is Promptfoo?
Promptfoo is an open-source tool designed to evaluate and secure large language models by testing prompts, models, agents, and RAG pipelines. It includes adversarial attacks like jailbreaks and prompt injection, making it essential for integrating security into CI/CD processes.
Key differentiator
“Promptfoo stands out as an open-source tool specifically designed to evaluate and secure large language models through adversarial attacks, making it unique among general-purpose AI testing tools.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Primary development and maintenance focus on Python, with limited official support for other languages
GitHub issues often take weeks to receive a response from maintainers
Fit analysis
Who is it for?
✓ Best for
Teams needing to evaluate large language models for security vulnerabilities
Organizations integrating AI into CI/CD processes who require robust testing frameworks
Developers looking to enhance their model's resilience against adversarial attacks
✕ Not a fit for
Projects that do not involve the evaluation or deployment of large language models
Teams without a need for continuous security testing in their development lifecycle
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Next step
Get Started with Promptfoo
Step-by-step setup guide with code examples and common gotchas.