FusionAuth is the authentication and authorization platform engineered for developers who demand flexibility and control. Built from the ground up to integrate with any stack, every feature — from user registration to MFA and SSO — is exposed via a modern, well-documented API.
Support for every major identity protocol is included out of the box: OIDC, SAML, OAuth2, JWT, passwordless login, social sign-on, and more. Whether you’re building a greenfield app or retrofitting auth into a legacy system, FusionAuth adapts to your use case — not the other way around.
Need compliance? FusionAuth helps you meet GDPR, HIPAA, and COPPA standards quickly and reliably.
Deploy it your way: install on Linux, Windows, macOS, Docker, or Kubernetes — or go with FusionAuth Cloud, our managed SaaS hosting. No black boxes. No vendor lock-in. Just powerful, customizable auth that works the way you do.
Learn more
Auth0 takes a modern approach to Identity and enables organizations to provide secure access to any application, for any user. Auth0 is highly customizable, and simple yet flexible. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation.
With Auth0, you can rapidly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control.
Learn more
Authsignal
Drop Authsignal into your identity stack to secure customer journeys and deliver world-class user authentication experiences. Focused on enabling product and fraud teams to orchestrate customer journeys and mitigate fraud, Authsignal makes it easy to deploy passkeys.
Delivering class-leading drop-in authentication experiences, product teams leverage Authsignal to drop authentication (Passkeys, push, SMS authentication) challenges anywhere in the user experience. Seamlessly authenticate identity, secure customer journeys, and protect customer data with a unified customer experience.
Gain a single view of customer activity and stream identity data with audit trails.
Passkeys, CIAM, IAM, Authentication, Passwordless Authentication,
Multifactor Authentication, Passkey
Learn more
Callsign
We specialize in identity fraud prevention, authorization, and authentication, addressing the difficulties organizations encounter when trying to onboard and engage users with their digital platforms. Many cutting-edge solutions tend to emphasize technological capabilities while neglecting the importance of user experience equally. Our engineering team, boasting a wealth of over 300 years of combined expertise from banking and e-commerce, is dedicated to making software accessible and effective for everyone. This extensive experience is the reason why some of the largest banks globally trust us, as we provide “bank-grade” identification solutions to clients in both the public and private sectors, regardless of their size. CallSign is committed to facilitating a smooth digital experience for users, ensuring they can navigate online securely—verified and checked—by enhancing their experience rather than hindering it. Our Intelligence Driven Authentication system leverages deep learning insights to identify users through an analysis of device, location, and behavioral data, creating a robust yet user-friendly security framework. Ultimately, we strive to redefine the standards of digital interaction, ensuring security is seamlessly integrated into everyday online activities.
Learn more
