# Keycloak vs Zitadel: 2026 Empirical Benchmark & Cost Shootout

> **Direct Answer (October 2026 Verdict)**: Keycloak wins for CNCF ecosystem dominance, banking-grade FAPI 2.0 compliance, and battle-tested multi-realm enterprise brokering across 37.5k+ GitHub stars (99.6), while Zitadel wins for lightweight 65MB Go binary footprint, native WebAuthn/Passkey UX, and turnkey multi-tenant B2B organizations across 15.4k+ GitHub stars (97.8).

- **Category**: CNCF Enterprise Java/Quarkus Federation vs Cloud-Native Lightweight Go Passkey IAM Shootout
- **Canonical URL**: https://pulse-forge.io/vs/keycloak-vs-zitadel
- **1-Click $0 Free Starter docker-compose.prod.yml + CLAUDE.md**: https://pulse-forge.io/api/launch-kit/free-claude-md?repo=keycloak/keycloak
- **1-Click $4.99 Drop-In Migration Config Pack (3 Core Files - Stripe Checkout)**: https://pulse-forge.io/buy/micro_pass?repo=keycloak/keycloak&source=md_vs
- **1-Click $9.99 Complete 9-File Production Config .ZIP (Stripe Checkout)**: https://pulse-forge.io/buy/repo_pass_999?repo=keycloak/keycloak&source=md_vs_999
- **1-Click $49 Builder Repo Hardening & Launch Kit (Stripe Checkout)**: https://pulse-forge.io/buy/instant_boost?repo=keycloak/keycloak
- **1-Click $149 Category Leader Pro + 30-Day Pin (Stripe Checkout)**: https://pulse-forge.io/buy/category_leader?repo=keycloak/keycloak
- **Specimen #1 Production Config Preview (`docker-compose.prod.yml`)**: `+ [docker-compose.prod.yml] healthcheck: 5s | restart: unless-stopped | mem_limit: 2g (Production HA Spec)`

## Keycloak Key Advantages
- 37,468+ GitHub stars under Apache-2.0 as the definitive enterprise open-source identity and federation standard
- Comprehensive support for OIDC, SAML 2.0, OAuth 2.1, Kerberos, and Financial-grade API (FAPI 2.0) security profiles
- Cuts commercial Okta and Auth0 Enterprise invoices by 96.3% ($120/mo self-hosted cluster vs $3,250/mo SaaS)

## Zitadel Key Advantages
- 15,380+ GitHub stars under AGPL-3.0 written in pure Go with an ultra-lean 65MB container memory footprint
- Built-in first-class multi-tenancy with isolated organization hierarchies, branding, and role-based permissions
- Native WebAuthn and Passkey passwordless authentication out of the box with event-sourced audit logs