Promptfoo is an open-source framework for AI red‑teaming and security testing that helps developers and security teams detect and mitigate risks such as prompt injection, data leakage, and insecure tool use. Founded in 2024 and based in San Francisco, the company's tools are used by over 100,000 developers and adopted by more than 30 Fortune 500 companies. Its commercial enterprise solution, launched a year ago, is used by retailers, telecoms, and financial institutions to securely deploy AI systems. The platform embeds automated red‑team tests into build and release processes, pairs findings with actionable remediation guidance, and feeds results into existing vulnerability-management workflows to provide end-to-end automation from discovery to resolution. Promptfoo positions itself as a standard for enterprise AI security and plans to scale its team and accelerate platform development to meet demand from Global 2000 customers. Promptfoo, based in San Francisco, CA and led by CEO Ian Webster, provides an open-source pentesting and evaluation framework for large language model applications. Its platform is used by over 25,000 software engineers to find and remediate vulnerabilities. Customers include companies such as Shopify, Amazon, and Anthropic. The company raised $5M in seed funding and intends to use the proceeds to help developers find and fix security issues in their AI applications. Promptfoo’s product focuses on testing, evaluation, and security hardening for LLM-powered software.

Total raised

$23M

Funding rounds

2

Latest round

Series A

Latest activity

Jul 2025