Best Multi-Factor Authentication APIs in 2026

FusionAuth

It suits teams managing end-user identity at scale that need authentication and authorization across applications.

It suits developers at startups or enterprises who need customizable authentication and session management.

Descope

Descope suits developers building customer or business applications that need authentication, user management and authorization.

It suits organizations that need MFA across endpoints, VPNs, web apps, or legacy systems, with cloud, on-premise, or hybrid deployment.

MojoAuth

MojoAuth suits teams building consumer apps that need customer sign-in across web and mobile, especially those moving users away from passwords.

It suits developers adding phone verification or multi-factor authentication to account flows on mobile, web, or API-based services.

LinOTP

LinOTP suits organizations seeking configurable multi-factor authentication across applications, directories, and databases.

Bird Verify

Bird Verify suits developers adding phone or email ownership checks through API or web integrations.

Stytch suits developers building applications that need authentication, organization access controls, fraud protection or identity services for integrations.

Plivo Verify

Plivo Verify suits direct brands building OTP-based two-factor authentication through an API.