Zitadel

Overview

Zitadel is an open-source identity platform built around a modern, API-first architecture and event-sourced audit trail. It offers OIDC, SAML, social login, passwordless, and multi-tenant organizations, available as both a managed cloud service and a self-hosted deployment with feature parity.

Capability deep-dive

Zitadel's strengths are developer experience and authentication. The APIs (gRPC and REST) are clean, passkeys and MFA are first-class, and the event-sourcing model gives a strong, queryable audit history that many competitors bolt on later. Multi-tenancy via organizations suits SaaS builders. Deployment flexibility is good, with the same product on cloud or self-hosted. Weaknesses: the ecosystem and community are smaller than Keycloak's, downstream provisioning (SCIM and connectors) is less mature than dedicated IGA tooling, and some advanced enterprise features sit behind the paid tiers. Self-hosting at scale still means running and tuning the underlying database. It is a strong modern alternative, just younger and with fewer integrations.

Pricing

Open source (self-host free under the project license). Managed cloud uses a transparent published model with a free tier and usage-based paid plans; enterprise self-host support is paid.

Bottom line

A clean, modern open-source IdP that developers like, with cloud-or-self-host parity and excellent auditability. Check provisioning depth against your downstream app needs.