ZITADEL is an open-source identity infrastructure platform that provides authentication and authorization capabilities for applications serving consumers, businesses, and employees. Core capabilities: Authentication: - Hosted login page with customizable branding - Social login integrations (Google, Microsoft, GitHub) - Passwordless authentication using Passkeys - Multi-factor authentication (MFA) enforcement - Single Sign-On (SSO) - Custom login UI via APIs Authorization: - Role-Based Access Control (RBAC) for assigning permissions based on user roles - Multi-tenant architecture natively built into the platform - Project grants enabling cross-organization access management Platform characteristics: - API-first design with comprehensive SDKs - Multi-tenant support allowing organizations to be added and managed independently - Self-hostable (open source) with a cloud-hosted option - Supports B2B and B2C identity use cases - Designed for extensibility and compliance ZITADEL bridges open-source and enterprise identity management, enabling developers to integrate authentication directly into applications or build custom login interfaces using its APIs. It supports identity provider (IdP) federation, allowing external identity providers to be linked to user accounts.