Duo Security

Cisco Duo, formerly known as Duo Security, is a prominent provider of cloud-based multi-factor authentication (MFA) and identity access management (IAM) solutions. Founded in 2010 in Ann Arbor, Michigan, the company became part of Cisco's security portfolio following its acquisition in 2018. Cisco Duo focuses on verifying user identities and device health to ensure secure access to applications, data, and networks. The platform offers a range of services, including phishing-resistant MFA, passwordless authentication, single sign-on, and device trust. It supports a diverse clientele, from small businesses to Fortune 500 companies, and serves various sectors such as healthcare, finance, and education. With a commitment to democratizing security, Cisco Duo aims to make security easy and effective for all users, facilitating approximately half a billion user logins each month.

• MFA/passwordless
• device trust posture checks
• SSO
• risk-based auth; part of Cisco

Per-user/month tiers (Free, Essentials ~$3, Advantage ~$6, Premier ~$9)