Promptfoo
Secure LLMs Using Open-Source Vulnerability Testing.
About
Promptfoo is a flexible tool built to improve the reliability and security of Large Language Model (LLM) applications. Developers can perform custom vulnerability testing with this open-source tool, guaranteeing that your AI product avoids potential threats and operates at peak efficiency. Promptfoo enables quick detection and resolution of application-specific risks, delivering a more secure user experience. Its thorough evaluation capabilities simplify the development workflow, cutting down on time and resources while enhancing the quality and dependability of your AI systems.
Details
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
Use Cases
- 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.
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.
Frequently Asked Questions
What is Promptfoo?
Promptfoo is an open-source tool for testing the security and reliability of LLM applications through customized vulnerability probes.
How does Promptfoo ensure the security of LLM applications?
Promptfoo uses customized vulnerability probes to detect issues like PII leaks, unauthorized prompt manipulations, and other critical failures.
Is Promptfoo open-source?
Yes, Promptfoo is completely open-source and supported by a community of seasoned contributors from major tech companies.
Can I use Promptfoo with different LLM API providers?
Yes, Promptfoo supports various LLM API providers such as OpenAI, Anthropic, Azure, Google, HuggingFace, and even allows for custom API integration.
What kind of vulnerabilities can Promptfoo detect?
Promptfoo can detect a range of vulnerabilities including PII leaks, competitor endorsements, unintended contracts, prompt injections, jailbreaks, and more.
Does Promptfoo require cloud dependencies or SDKs?
No, Promptfoo operates locally without the need for SDKs, cloud dependencies, or logins.
What is test-driven LLM development?
Test-driven LLM development involves building and refining LLM applications through systematic testing and evaluation, as opposed to trial-and-error methods.
How does Promptfoo help in building reliable LLM apps?
Promptfoo offers evaluations, security, and red teaming capabilities to build, test, and refine reliable LLM applications efficiently.
Can Promptfoo generate detailed vulnerability reports?
Yes, Promptfoo provides in-depth analysis of detected vulnerabilities along with practical remedies.
Who uses Promptfoo?
Promptfoo is trusted by over 20,000 developers, including teams from major tech companies for securing their LLM applications.