Question 1

What is the difference between OATH (Open Authentication) vs ZITADEL?

Accepted Answer

**OATH (Open Authentication)**: Vendor-neutral org publishing open standards for OTP & strong auth. built by OATH (Open Authentication). Core capabilities include Open, royalty-free OTP specifications (HOTP, TOTP, OCRA), HOTP (RFC 4226): counter-based HMAC one-time password standard, TOTP (RFC 6238): time-based one-time password standard..

**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.

Question 2

What features do OATH (Open Authentication) vs ZITADEL offer?

Accepted Answer

**OATH (Open Authentication)** differentiates with Open, royalty-free OTP specifications (HOTP, TOTP, OCRA), HOTP (RFC 4226): counter-based HMAC one-time password standard, TOTP (RFC 6238): time-based one-time password standard. **ZITADEL** differentiates with Hosted login page with customizable branding, Multi-factor authentication (MFA) enforcement, Passwordless authentication via Passkeys.

Question 3

Who makes OATH (Open Authentication) vs ZITADEL?

Accepted Answer

**OATH (Open Authentication)** is developed by OATH (Open Authentication). **ZITADEL** is developed by ZITADEL. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Question 4

Is OATH (Open Authentication) a good alternative to ZITADEL?

Accepted Answer

OATH (Open Authentication) 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, MFA, Open Source. Key differences: OATH (Open Authentication) is Free while ZITADEL is Commercial. Review the feature comparison above to determine which fits your requirements.

OATH (Open Authentication) vs ZITADEL: Side-by-Side Comparison (2026)

OATH (Open Authentication)

ZITADEL

Side-by-Side Comparison

NIST CSF 2.0 Mapping

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OATH (Open Authentication) vs ZITADEL FAQ

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