Zitadel
By Zitadel
0.
Definition
Zitadel is an open-source identity and access management (IAM) platform providing authentication, authorization, and user management via OIDC, OAuth 2.0, and SAML 2.0.
Overview
Zitadel is a modern, cloud-native alternative to legacy identity and access management systems, built to be either self-hostable or consumed as a managed cloud service. It implements standard identity protocols — OIDC, OAuth 2.0, and SAML 2.0 — for single sign-on, and supports multi-factor authentication and passwordless login alongside fine-grained role-based access control. Users, projects, and applications are organized into multi-tenant structures suited to B2B SaaS products, and management APIs allow teams to automate user provisioning rather than configuring everything by hand. Zitadel competes with platforms like Keycloak, Auth0, Ory, and Clerk in the identity space, and it's commonly integrated into applications that need enterprise SSO alongside secrets managers like Vault for handling the rest of an application's sensitive credentials.
Key Features
- Native support for OIDC, OAuth 2.0, and SAML 2.0 protocols
- Multi-factor authentication and passwordless login options
- Multi-tenant organization and project structure for B2B SaaS
- Fine-grained role-based access control (RBAC)
- Self-hostable or available as a managed cloud service
- Management APIs for automating user and application provisioning