Promptfoo

Free

Secure LLMs Using Open-Source Vulnerability Testing.

CybersecurityFreeFree tier

#open-source#security#reliability#LLM#vulnerability scanner#PII leaks#prompt manipulation#vulnerability reports

Type

Saas

Company

Promptfoo (now part of OpenAI)

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About Promptfoo

Promptfoo is an open-source AI security testing tool now part of OpenAI. It enables developers and enterprises to build secure, reliable AI applications through automated red teaming, vulnerability scanning, and continuous monitoring. Integrated into CI/CD pipelines and developer workflows, Promptfoo simulates real users to uncover application-specific vulnerabilities such as prompt injections, jailbreaks, data/PII leaks, business rule violations, insecure tool use, and toxic content generation. Trusted by 156 Fortune 500 companies and backed by a community of over 272 contributors and 300k+ users, it provides real-time threat intelligence and actionable remediation guidance directly in pull requests.

Key Features

Open-source

Customized vulnerability probes

Detection of PII leaks

Protection against unauthorized prompt manipulations

Prevention of jailbreaks

Detailed vulnerability reports

Support for multiple LLM API providers

Local operation without cloud dependencies

Test-driven LLM development

Community-supported

Pros & Cons

Pros

Open-source with a free tier that includes red teaming (up to 10k probes/month) and all evaluation features.
Comprehensive vulnerability coverage (50+ types) tailored to application context (RAG, agents, business logic).
Seamless integration into existing developer workflows (PRs, CI/CD, local environment).
Backed by a large community (272+ contributors, 300k+ users) and now part of OpenAI for long-term support.
Trusted by 156 Fortune 500 companies across industries (healthcare, telecom, retail, etc.).
Supports on-premise deployment for complete data isolation and compliance.
Real-time threat intelligence from the community keeps tests current.

Cons

Free tier limits red teaming to 10,000 probes per month; larger-scale testing requires paid Enterprise plan.
Advanced features (team collaboration, continuous monitoring, SSO) are only available in Enterprise or On-Premise plans.
Requires some technical expertise to set up and configure custom attacks effectively.
As an open-source tool, documentation and community support may not match commercial vendors for enterprise users without paid support.

Best For

Developers of LLM applications: Ensuring security by detecting PII leaks, unauthorized prompt manipulations, and other vulnerabilities.Security Analysts: Running comprehensive pentests to verify the security, privacy, and compliance performance of LLMs.Open-Source Contributors: Collaborating on improving an open-source tool used for LLM security and reliability.Large Organizations: Implementing reliable and secure LLM applications without depending on cloud services or SDKs.Tech Startups: Rapidly developing and fine-tuning LLM models with customized tests and vulnerability scans.Educators: Teaching students about LLM application security using a practical, open-source tool.QA Engineers: Automating red teaming and security tests for CI/CD pipelines.AI Researchers: Evaluating different LLM models and prompts efficiently using Promptfoo's comprehensive tools.Compliance Officers: Ensuring LLM applications meet regulatory and compliance standards through detailed reporting.Product Managers: Overseeing the development of secure LLM applications with actionable insights from vulnerability reports.

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