BastionZero OpenPubkey vs ZITADEL: 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..

ZITADEL: Open-source, multi-tenant identity platform for authn, authz, and SSO. built by ZITADEL. Core capabilities include Hosted login page with customizable branding, Multi-factor authentication (MFA) enforcement, Passwordless authentication via Passkeys..

Both serve the Multi-Factor Authentication and Single Sign-On 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. ZITADEL differentiates with Hosted login page with customizable branding, Multi-factor authentication (MFA) enforcement, Passwordless authentication via Passkeys.

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

BastionZero OpenPubkey and ZITADEL serve similar Multi-Factor Authentication and Single Sign-On use cases: both are Multi-Factor Authentication and Single Sign-On tools, both cover Authentication, SSO, Open Source. Review the feature comparison above to determine which fits your requirements.