The round was led by global software investor Insight Partners, with participation from existing investor Andreessen Horowitz.

Promptfoo is the most widely adopted open source AI security testing platform, enabling enterprises to identify and remediate vulnerabilities in their AI systems before deployment. Founded in 2024, the company's tools are used by over 100,000 developers worldwide, while its enterprise platform secures AI applications for Fortune 500 companies across retail, telecommunications, finance, and media.