Best 9 Single Sign-On Providers to use in 2025

Authentik is a tool that manages how users sign in to your applications and services. Think of it as a central security checkpoint that verifies who someone is before letting them access your systems.

Casdoor is a complete identity management solution that handles user authentication and authorization for your applications. It supports OAuth 2.0, OpenID Connect, SAML, CAS, and LDAP protocols, making it compatible with almost any application or service.

Tesseral is a complete authentication system designed for business-to-business software applications. It handles user login, permission management, and security features so developers can focus on building their main product.

Ping Identity is a complete security platform that manages who can access your business applications and data. It acts as a gatekeeper, checking user identities before allowing access to sensitive information. When someone tries to log in, Ping Identity verifies they are who they claim to be using various methods like passwords, phone authentication, or fingerprints.

Pomerium is a zero trust access proxy that sits between users and internal applications. It verifies identity and permission before allowing access to any resource. The tool works by connecting to your existing identity provider like Google, Okta, Azure, or others.

OneLogin is a cloud platform that manages who can access your company's apps and data. It acts as a central hub where users log in once and gain access to all their authorized applications without needing separate passwords for each tool.

Okta is a tool that handles identity and access management in the cloud. It lets businesses control who can use their apps and resources safely. When someone needs to log in, Okta checks their identity and decides what they can access based on company rules.

Auth0 is an identity and access management platform that handles user authentication and authorization for web and mobile applications. It works as a service that sits between your application and your users, managing who can access what.

WorkOS is an API platform that provides enterprise authentication and identity features for web applications. When you need to add features like company login systems or user management to your app, WorkOS provides the technical foundation.