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Securing the Future of AI

Promptfoo helps developers and enterprises build secure, reliable AI applications.

About Us

We are security and engineering practitioners who have scaled generative AI products to hundreds of millions of users. We're building the tools that we wished we had when we were on the front lines.

Based in San Mateo, California, Promptfoo joined OpenAI on March 16, 2026. Promptfoo remains open source, and we continue to build tools for secure, reliable AI applications.

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Our founders

Ian Webster

Ian Webster

CEO & Co-founder

Ian previously led LLM engineering and developer platform teams at Discord, scaling AI products to 200M users while maintaining rigorous safety, security, and policy standards.

Michael D'Angelo

Michael D'Angelo

CTO & Co-founder

Michael brings extensive experience in AI and engineering leadership. As the former VP of Engineering and Head of AI at Smile Identity, he has a track record of scaling ML solutions to serve over 100 million people across hundreds of enterprises.

Early Supporters

We're grateful to the investors and operators who backed Promptfoo early and helped us build open-source, application-focused AI security.

Ganesh Bell

Ganesh Bell

Managing Director, Insight Partners

Zane Lackey

Zane Lackey

General Partner, Andreessen Horowitz Founder, Signal Sciences

Joel de la Garza

Joel de la Garza

Investment Partner, Andreessen Horowitz CISO, Box

Tobi Lutke

Tobi Lutke

CEO, Shopify

Stanislav Vishnevskiy

Stanislav Vishnevskiy

CTO, Discord

Frederic Kerrest

Frederic Kerrest

Vice-Chairman & Co-Founder, Okta

Adam Ely

Adam Ely

EVP, Head of Digital Products, Fidelity CISO, Fidelity

An Incredible Open Source Community

Promptfoo is proud to be supported by a vibrant community of over 255 open source contributors.

Promptfoo Contributors

Ready to Secure Your AI Applications?

Join leading enterprises who trust Promptfoo to fortify their AI applications.

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