Zitadel
An open-source identity and access management platform with multi-tenancy, SSO, MFA, and API-first design for developers.
What is Zitadel?
ZITADEL is an open-source identity and access management platform that simplifies identity infrastructure for developers. It provides a comprehensive suite of authentication and authorization features, including SSO, MFA, passkeys, and multi-tenancy, all accessible via an API-first design. The platform solves the problem of securing applications with robust, scalable identity management without vendor lock-in.
Developers and teams building SaaS products, B2B platforms, or any application requiring production-grade IAM with multi-tenancy, self-hosting capabilities, and API-driven integration.
Developers choose ZITADEL for its strict multi-tenant hierarchy, event-driven audit trail, and API-first design that offers parity between SaaS and self-hosted deployments. Its open-source nature and comprehensive feature set provide control and flexibility without compromising on enterprise-grade capabilities.
Overview
ZITADEL - Identity infrastructure, simplified for you.
Use Cases
Best For
- Securing SaaS products with multi-tenant identity management
- Building B2B platforms with customizable onboarding and self-service
- Self-hosting a production IAM stack with zero-downtime updates
- Integrating identity via typed APIs (gRPC, REST) for machine-to-machine workflows
- Implementing comprehensive audit trails and SOC/SIEM integration
- Deploying scalable identity infrastructure with Docker or Kubernetes
Not Ideal For
- Startups or small projects that only need basic username/password authentication without SSO or multi-tenancy
- Teams lacking dedicated DevOps resources to manage self-hosted deployments with Docker or Kubernetes
- Applications requiring out-of-the-box, heavily branded login UIs with minimal frontend development effort
Pros & Cons
Pros
Supports a layered model with instances, organizations, and projects for isolated data and policies, ideal for complex B2B scenarios as highlighted in the comparison table.
Every resource is accessible via connectRPC, gRPC, and REST APIs, enabling seamless programmatic integration, with comprehensive documentation and examples.
All mutations are recorded as events, providing a complete audit stream that can be exported to SOC/SIEM systems, a key differentiator emphasized in the features.
Offers zero-downtime updates and horizontal scalability without external session stores, supported by Docker Compose and Kubernetes guides for production environments.
Cons
Self-hosting requires managing PostgreSQL, container orchestration, and high availability, which can be complex and resource-intensive for teams without infrastructure expertise.
The API-centric approach means developers must build custom integrations rather than using drop-in modules, increasing initial setup time compared to more opinionated services.
While feature-rich, the third-party plugin and community contribution ecosystem is less mature than established competitors like Auth0 or Keycloak, potentially limiting ready-made solutions.
Open Source Alternative To
Zitadel is an open-source alternative to the following products:
Auth0 is a cloud-based identity and access management platform that provides authentication and authorization services for applications. It supports single sign-on, multi-factor authentication, and social login integrations.
Keycloak is an open-source identity and access management solution that provides single sign-on, user federation, and social login capabilities for web applications and services.
An identity and access management platform that provides secure authentication, authorization, and user management for applications.
Frequently Asked Questions
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