Aserto vs Duo Adaptive Access: Side-by-Side Comparison (2026)

Short answer

Mid-market and enterprise teams managing fine-grained access across microservices and APIs should pick Aserto for its 1ms authorization latency, which makes it viable for real-time decision-making without degrading application performance. The tool's support for relationship-based access control (ReBAC) via a Zanzibar-inspired directory gives you the modeling flexibility that RBAC and ABAC alone cannot provide for complex permission hierarchies. Skip this if your organization is early-stage and still consolidating identity providers; Aserto assumes mature directory integrations and demands policy-as-code discipline that smaller teams may not yet need. Teams protecting distributed workforces will find Duo Adaptive Access most valuable for its risk-based decision engine that actually blocks access before compromise rather than logging it afterward. The push to continuous authentication and real-time threat detection maps directly to NIST CSF 2.0's Identity Management function, meaning your access controls adapt to actual risk instead of static rules. Skip this if you need device inventory and vulnerability correlation; Duo assumes your devices are already managed elsewhere.