Promptfoo Raises $18.4M Series A to Build the Definitive AI Security Stack

Promptfoo, a company focused on AI security, has successfully raised $18.4 million in a Series A funding round led by Insight Partners, with notable participation from Andreessen Horowitz. Founded in 2024, Promptfoo addresses the growing security challenges associated with deploying generative AI applications, offering solutions that cater to over 125,000 developers and more than 30 Fortune 500 companies. The company tackles issues like prompt injection, data leakage, and insecure tool use that arise from complex architectures such as agents, RAGs, and MCPs. With the addition of Ganesh Bell from Insight Partners to its board, Promptfoo aims to further its mission by enhancing support for agentic workflows, adopting MCP as a standard for tool calls, and integrating audio features for securing spoken applications. The company envisions a future where adversarial testing becomes as integral and routine as unit testing in traditional software development, positioning itself as a critical player in the AI security landscape. Promptfoo's development roadmap focuses on building robust AI security infrastructure akin to CI pipelines in DevOps, supporting its long-term vision of comprehensive and automatic security evaluations.