5 Open Source Alternatives To Auth0

Keycloak is an open-source identity and access management solution designed to add authentication to applications and secure services with minimal effort. It eliminates the need for developers to handle user storage or authentication processes themselves.

• Single-Sign On: Users authenticate with Keycloak rather than individual applications, facilitating seamless access across multiple applications.
• Identity Brokering and Social Login: Easily enable social network logins and authenticate users with existing OpenID Connect or SAML 2.0 Identity Providers.
• User Federation: Connect to existing LDAP or Active Directory servers, or implement custom providers for other user stores.
• Admin Console: Centrally manage all aspects of the Keycloak server, including user federation, identity brokering, and fine-grained authorization policies.
• Account Management Console: Allow users to manage their profiles, passwords, two-factor authentication, sessions, and account history.
• Standard Protocols: Supports OpenID Connect, OAuth 2.0, and SAML for seamless integration.
• Authorization Services: Beyond role-based authorization, Keycloak provides fine-grained authorization services for detailed policy management.

Keycloak is a Cloud Native Computing Foundation incubation project, continuously evolving to meet modern authentication and authorization needs.

authentik is an open-source Identity Provider designed to offer flexibility and versatility. It supports a wide range of authentication protocols and can be used as a self-hosted replacement for large-scale deployments of commercial identity providers like Okta, Auth0, Entra ID, and Ping Identity. Whether for employees or B2B2C use, authentik aims to be the authentication glue you need.

• Protocol Support: authentik supports a wide range of protocols including SAML, OAuth2, and OIDC.
• Self-Hosted: Ideal for organizations looking to replace commercial IdPs with a self-hosted solution.
• Enterprise-Ready: Suitable for large-scale deployments and offers enterprise-grade features.
• Docker & Kubernetes: Easily deployable using Docker Compose for small setups or Helm Charts for larger environments.
• Extensible: Highly customizable to meet the unique needs of your organization.
• Community-Driven: Open-source and backed by a strong community of contributors.

authentik is the go-to solution for organizations seeking a flexible, versatile, and self-hosted Identity Provider. With its robust feature set and strong community support, authentik is well-suited for both small and large-scale deployments.

ZITADEL is an all-in-one identity platform designed to simplify authentication and authorization for your applications. Tailored for consumers, businesses, and employees, it offers a seamless and secure way to manage user identities and access controls, allowing you to focus on growing your application without worrying about login complexities.

• Hosted Login: Easily authenticate users with a customizable hosted login page.
• Modern Authentication Methods: Use prebuilt Identity provider templates to integrate social logins and enable SSO.
• Improved Security: Enforce multifactor authentication and use passkeys for secure access.
• Custom Login: Build authentication directly into your applications using our APIs.
• Role-Based Access Control: Assign permissions based on user roles within your applications.
• Multi-Tenant Support: Extend application scope by adding new organizations and granting projects.
• ZITADEL Actions: Execute workflows after predefined events without deploying code.
• Streamlined APIs: Utilize modern gRPC and REST APIs for efficient identity management.
• Comprehensive Documentation: Access detailed guides and API references to answer all your questions.
• Flexible Deployment: Run ZITADEL across different data regions.
• Machine Identity Management: Manage identities for machines and service users.
• Example Applications: Clone existing example applications to get started quickly.

ZITADEL is engineered for developers, offering a robust array of identity tools that offload complex tasks through solid API abstractions. It is highly adaptable, allowing custom code extensions and maintaining strong security defaults. Join a growing community of developers leveraging ZITADEL to solve complex identity management challenges.

Ory provides a modern and modular approach to Identity and Access Management (IAM) that scales to meet your needs. It offers unmatched user experience and deployment flexibility while only charging for what you use. Whether you need self-hosted solutions or enterprise-level support, Ory has you covered with a range of deployment models and premium support options.

• Self-hosted (Open Source): Run and try Ory’s Open Source components with maximum flexibility. Perfect to meet your specific use-cases or proof-of-concept your next big idea.
• Enterprise Support: Combine the flexibility of self-hosting Ory’s Open Source components with expertise and coverage for your customized deployment when you need it.
• Enterprise License: Leverage Ory's optimized code base with premium support for mission-critical production environments, on-prem or wherever else you need it, always up to date.
• Ory Network: Enable your instant-on global identity system with speed, security, compliance, and support for the fastest time to value and lowest total cost of ownership.

Ory’s IAM stack is designed to balance user experience, privacy, and security. It offers fully configurable options and comprehensive visibility, ensuring uninterrupted performance even under the most demanding conditions. With SDKs for every modern and legacy framework, migration guides, and extensive documentation, Ory is loved by engineers and trusted by companies worldwide. Whether you're migrating from home-grown solutions or other platforms, Ory provides the flexibility and support you need to succeed.

Authelia is an open-source authentication and authorization server and portal designed to provide identity and access management (IAM) for web applications. It offers multi-factor authentication (MFA) and single sign-on (SSO) capabilities, acting as a companion for common reverse proxies to enhance security and user experience.

• Lightweight: With a compressed container size smaller than 20 megabytes and memory usage under 30 megabytes, Authelia is highly efficient.
• Blazing Fast: Written in Go and React, it completes authorization policies and backend tasks in milliseconds, with login portal loading times around 100 milliseconds.
• Efficient: Minimal idle processor usage and low active usage in small business environments.
• Security by Design: Security is a core consideration in Authelia's design process.
• Login Regulation: Prevent brute force attacks by limiting the number of login attempts before locking the user account.
• Password Reset: Users can reset their LDAP or internal passwords via email validation directly from the web interface.
• Single Sign-On: Users only need to log in once to access multiple web applications via session cookies, OpenID Connect 1.0, or Trusted Headers.
• Authorization Policies: Define granular access control policies for users and groups to specific resources or domains.
• Identity Validation: Users without a second-factor device must validate their identity via email, reducing the risk of exploitation.
• Scalability: Designed for high availability, it supports multiple parallel containers on platforms like Kubernetes.
• Multi-Factor Authentication: Supports various second-factor methods, including One Time Passwords, Mobile Push Notifications, and WebAuthn.
• Intuitive User Interface: The login portal is straightforward, offering a transparent workflow for users.

Authelia is a robust solution for enhancing the security and usability of web applications through advanced IAM features.