Cisco DUO Logo

Cisco Duo, formerly known as Duo Security, is a cybersecurity company specializing in multi-factor authentication (MFA), zero-trust security, and secure access solutions Duo Security was founded in 2010 by Dug Song and Jon Oberheide in Ann Arbor, Michigan The company quickly rose to prominence for its user-friendly and effective approach to protecting organizational networks and data

In 2018, Duo was acquired by Cisco Systems, one of the world’s leading networking and cybersecurity companies Since then, the product has been branded as Cisco Duo, continuing its mission to simplify secure access and strengthen enterprise security posture through innovative identity and access management solutions

Originally, Duo Security used a lowercase, green wordmark logo that embodied simplicity and approachability Post-acquisition by Cisco, the brand identity was refreshed while preserving its distinctive green color and minimalist design philosophy The new logo proudly integrates the “Cisco” name above the stylized "DUO" lettering, signifying the merger of Duo’s core identity with Cisco’s global recognition

The design is now bolder, cleaner, and more geometric — showcasing evolution while retaining visual continuity for existing users

The Cisco Duo logo stands out with its uniquely geometric design and use of negative space, aligning with the brand’s values of simplicity, security, and modern innovation

The word “DUO” is composed entirely of abstract geometric shapes: half circles, rectangles, and arcs This design choice adds visual intrigue and creates a modular, almost architectural structure — reflecting the robust yet flexible nature of Duo’s security solutions

Each letter is formed from simple shapes

These elements create a logo that’s minimalist but highly distinctive, evoking structure and precision — ideal qualities for a security-focused technology brand