FusionAuth
FusionAuth is a modern, developer-focused identity and access management platform built to give you full control over your authentication stack. Whether you’re building a startup app or managing enterprise-scale infrastructure, FusionAuth delivers all the must-have features — from login and SSO to advanced protocols like OAuth2, OIDC, SAML, and WebAuthn — in a self-hostable or cloud-native package.
Designed with developers in mind, FusionAuth integrates seamlessly with any language, framework, or architecture. Every capability is API-first and built for extensibility, so you can tailor authentication workflows without getting locked into rigid, inflexible systems.
FusionAuth supports all the key use cases — user registration, multi-factor authentication (MFA), passwordless login, role-based access control, and more — while helping you stay compliant with GDPR, HIPAA, PCI, and other regulatory standards.
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Auth0
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.
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Magic
Plug and play auth that's radically better. Get peace of mind by integrating unstoppable passwordless authentication that scales with you in a snap. Building auth on your own is higher stakes than ever. Whether you’re a seasoned dev or building your first app, there’s a lot to unpack when starting from scratch. Worrying about vendor lock-in, friction for users, scalability, reliability, security, privacy, compliance, and constant cyber threats is a massive responsibility. Magic links, and so much more. With a few lines of code, no bloat, and zero unnecessary config, your app can support a variety of passwordless login methods. Our SDKs make it easy to get up and running with battle-tested authentication, so you can ship faster. Bring your tech stack and stay in flow. Magic integrates with modern programming languages and frameworks. Less overhead means more time focused on building the best possible product for your users.
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