TrustFour vs Willow Identity & Access: Side-by-Side Comparison (2026)

TrustFour: TLS control plane securing NHIs via mTLS, ephemeral PSKs, and workload policy. built by TrustFour. Core capabilities include Policy-driven mutual TLS (mTLS) enforcement between workloads, Short-lifetime certificate issuance and automated rotation, One-time-use Pre-Shared Keys (PSKs) for ephemeral session credentials..

Willow Identity & Access: IAM layer for AI agents, inheriting identity from employees via existing IdP. built by Willow. Core capabilities include Zero-trust runtime authentication for every agent interaction with no persistent sessions, Agent identity primitives: scoped, time-bound credentials tied to real user accounts, Role-based access control inheriting operator entitlements at the action level..

Both serve the Non-Human Identity market but differ in approach, feature depth, and target audience.

TrustFour differentiates with Policy-driven mutual TLS (mTLS) enforcement between workloads, Short-lifetime certificate issuance and automated rotation, One-time-use Pre-Shared Keys (PSKs) for ephemeral session credentials. Willow Identity & Access differentiates with Zero-trust runtime authentication for every agent interaction with no persistent sessions, Agent identity primitives: scoped, time-bound credentials tied to real user accounts, Role-based access control inheriting operator entitlements at the action level.

TrustFour is developed by TrustFour. Willow Identity & Access is developed by Willow. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

TrustFour and Willow Identity & Access serve similar Non-Human Identity use cases: both are Non-Human Identity tools, both cover Non-Human Identity, Agentic AI Security, Least Privilege. Review the feature comparison above to determine which fits your requirements.