AccessMatrix UAS vs Scalekit IdP-Initiated SSO: Side-by-Side Comparison (2026)

AccessMatrix UAS

Mid-market and enterprise teams standardizing on vendor-agnostic authentication will find AccessMatrix UAS valuable for avoiding lock-in while supporting biometrics, FIDO2, and hardware security modules in parallel. The platform handles 100 million plus user scale and integrates with token vendors from OneSpan to Thales without custom engineering, which matters when you're already managing heterogeneous hardware across regions. Skip this if your organization needs out-of-the-box connectors to your existing identity provider; AccessMatrix is an authentication server, not a replacement for your IAM platform.

Scalekit IdP-Initiated SSO

Mid-market and enterprise teams managing multiple identity providers without a unified user directory will move fastest with Scalekit IdP-Initiated SSO, since it converts IdP-initiated requests to SP-initiated flows automatically and requires zero user migration. The JWT-signed SAML assertions and webhook support for custom workflows address the PR.AA and PR.DS functions that most SSO deployments leave half-built. Skip this if your organization has already standardized on a single IdP or needs deep directory synchronization; Scalekit solves the conversion problem, not the identity source problem.