Best Passwordless Authentication Software for Auth.js

Auth0 takes a modern approach to Identity, providing secure access to any application, for any user. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation. Auth0 is part of Okta, The World’s Identity Company™. Auth0 lets you quickly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control. Authenticate users across all applications with a customized, secure, and standards-based single login. Universal Login connects users to a central authorization server. Credentials aren’t transferred across sources, which boosts security and protects against phishing and credential stuffing attacks. OAuth 2.0 recommends that only external user agents (like the browser) be used by native applications for authentication flows. Auth0’s Universal Login achieves this while enabling SSO.

Many developers don’t realize Keycloak, a free and open-source IAM tool, offers powerful user management, authentication, and custom login features. However, managing and scaling Keycloak can be complex. Skycloak simplifies this by providing a managed Keycloak service, eliminating maintenance overhead, cutting costs, and ensuring compliance—giving you enterprise-grade IAM without the hassle.