BastionZero OpenPubkey vs BIO-key PortalGuard: Side-by-Side Comparison (2026)

BastionZero OpenPubkey: Open source authentication binding public keys to identities via SSO/OpenID. built by BastionZero. Core capabilities include Public key binding to user and workload identities, SSO-based authentication, OpenID Connect integration..

BIO-key PortalGuard: Zero Trust IAM platform with MFA, SSO, passwordless auth, and SSPR. built by BIO-key International. Core capabilities include Multi-Factor Authentication (MFA) with 16 supported authentication methods, Passwordless authentication via biometrics (palm, face) and passkeys, Single Sign-On (SSO) including thick client application support..

Both serve the MFA & Passwordless market but differ in approach, feature depth, and target audience.

BastionZero OpenPubkey differentiates with Public key binding to user and workload identities, SSO-based authentication, OpenID Connect integration. BIO-key PortalGuard differentiates with Multi-Factor Authentication (MFA) with 16 supported authentication methods, Passwordless authentication via biometrics (palm, face) and passkeys, Single Sign-On (SSO) including thick client application support.

BastionZero OpenPubkey is developed by BastionZero. BIO-key PortalGuard is developed by BIO-key International. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

BastionZero OpenPubkey and BIO-key PortalGuard serve similar MFA & Passwordless use cases: both are MFA & Passwordless tools, both cover SSO, Authentication. Review the feature comparison above to determine which fits your requirements.