MFA
Duo Security
Founded 2010Ann Arbor, MI, USASubsidiary of Cisco (NASDAQ: CSCO)Score 4.6/5Evaluated 2026-01-15Website ↗
Overview
Duo is the reference best-of-breed MFA. Push notifications, hardware keys, risk-based policies, and a strong free tier. Acquired by Cisco in 2018 but still operates with relative independence.
Independent editorial review. Author: Deepak Gupta. Last evaluated 2026-01-15.