Security that begins, and stays with people

At Duo, it starts with people. The ones using our products, the ones building them, and the ones they’re meant to protect. That includes over 40,000 customers who trust us every day. That’s why we lead with trust to build security that fits into real lives.

The Duo difference

Duo Security makes strong protection simple with easy-to-use multi-factor authentication and smart, risk-based tools. By minimizing friction, it helps users stay secure without slowing them down. Built for real-world needs, Duo supports safer access for everyone.

1B+

Monthly User Authentications

100K

Customers Globally

Our story starts with trust

Duo Security was founded in 2010 by Dug Song and Jon Oberheide to make secure access simple and human-centered. Starting in Ann Arbor with MFA, Duo grew quickly, reaching 2,000 customers by 2015.

As we expanded, our focus remained on user experience and trust. Today, Duo offers a full suite of easy-to-use, hard-to-compromise security tools, including strong phishing-resistant MFA, device trust, and identity security to protect what matters most.

In 2018, we joined Cisco, extending our reach to 40,000+ customers in 100+ countries as part of Cisco Security.

Dug Song speaking at an event. Dug Song is Duo Security's co-founder that founded Duo in 2010 with Jon Oberheide.

Why customers trust Duo

Duo delivers security that fits the way you work. It’s fast to deploy, simple to use, and trusted by teams everywhere. Whether you’re securing a small business or a global enterprise, Duo makes it easy to stay protected without slowing anyone down.

Phishing-resistant MFA that keeps threats out
Risk-based authentication that adapts to users in real time
Seamless app integrations under one secure platform
Fast, user-friendly setup that lightens the load for IT
Identity security that verifies users without slowing them down

See why teams choose Duo

Duo customer with Duo employee having a conversation about why Duo was their chosen identity security solution provider.

Cisco Identity Intelligence allows our security team to identify and prioritize ways to improve our overall security posture 24/7. We benefit from swift responses to detected threats while still offering a seamless end user experience... Ultimately, Duo gives us the assurance that we’re mitigating the threats to our day‑to‑day operations.

Read the customer story

Hugo Egerton

Information Security Engineer, B&M Retail

The entrance to the University of Sunderland in London

Within the span of eight months we realized massive benefits. We observed a significant increase in productivity not only for users, but also for staff and faculty. Happy end users mean fewer help desks tickets and complaints to IT teams who already have enough on their plates when it comes to managing information security.

Read the customer story

Andrew Spenceley

Cyber Security Architect, University of Sunderland

An engineer and a construction manager meet at large building construction site.

Duo is the most successful end-user facing solution I've ever been involved in deploying.

Read the customer story

Lance Honer

Manager of Cybersecurity, Day & Zimmermann

Work with us

We’re looking for curious, collaborative thinkers ready to shape the future of security. Our products help create a safer, more accessible digital world. Explore open roles and join a team that leads with empathy, purpose, and impact.

Explore career opportunities with Cisco

Two Duo employees playing a game of cornhole in the Duo office.

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