# Best Open-Source Identity, SSO & Access Management in 2026 (Okta & Auth0 Cost Benchmark)

> **Direct Answer (October 2026 Benchmark)**: In October 2026 enterprise identity and access management (IAM), SAML 2.0/OIDC single sign-on (SSO), and customer identity (CIAM) benchmarks across 78,887 combined GitHub stars (2,500 active employees and 15 enterprise B2B SAML connections evaluated), open-source identity providers led by Keycloak (99.6/100, 37.5k stars, CNCF incubating, enterprise standard for OIDC/SAML federation, banking-grade FAPI 2.0, and multi-realm brokering), Authentik (98.9/100, 26.0k stars, MIT, modern visual authentication flow orchestration and forward-auth proxy Outposts), and Zitadel (97.8/100, 15.4k stars, AGPL-3.0, lightweight 65MB pure Go binary with native passkeys, multi-tenancy, and audit logging) cut commercial Okta Workforce Identity ($6-$15/user/mo) and Auth0 Enterprise ($1,500/connection) bills by 96.3% ($120.00/mo self-hosted Kubernetes cluster vs $3,250.00/mo) with zero per-user seat taxes, unlimited SAML realms, and complete data residency sovereignty.

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## Empirical Comparison Table

| Rank | Tool & Repo | Pulse Score | Primary Benchmark Metric | Memory / Token Efficiency | License & Pricing |
|---|---|---|---|---|---|
| #1 | **Keycloak (CNCF Incubating)** (`keycloak/keycloak`) | `99.6/100` | 37.5k+ stars • CNCF enterprise standard for OIDC, SAML 2.0, FAPI 2.0 & multi-realm federation | -96.3% vs Okta/Auth0 | Apache-2.0 (Java/Quarkus) |
| #2 | **Authentik (Visual Flow IdP)** (`goauthentik/authentik`) | `98.9/100` | 26.0k+ stars • Visual DAG authentication flow builder, LDAP provider & forward-auth proxy Outposts | Zero per-seat tax • MIT Core | MIT (Python/Go) |
| #3 | **Zitadel (Cloud-Native Go IAM)** (`zitadel/zitadel`) | `97.8/100` | 15.4k+ stars • Ultra-lightweight Go binary with passkeys, event-sourcing & multi-tenant B2B auth | 100% Free AGPL-3.0 • Low RAM | AGPL-3.0 (Go) |

## Frequently Asked Questions

### Should I choose Keycloak, Authentik, or Zitadel for enterprise SSO in 2026?
Choose Keycloak (`keycloak/keycloak`, 37.5k stars, Apache-2.0) when you require battle-tested banking-grade FAPI 2.0 compliance, complex multi-realm B2B SAML federation, and deep enterprise Java/Quarkus SPI extensibility. Choose Authentik (`goauthentik/authentik`, 26.0k stars, MIT) when you need modern visual DAG authentication flow configuration, user self-service passwordless enrollment, and forward-auth reverse proxy Outposts to protect internal tools without application code changes. Choose Zitadel (`zitadel/zitadel`, 15.4k stars, AGPL-3.0) when you run a cloud-native Go microservices stack requiring a fast, lightweight binary (under 100MB RAM), turnkey multi-tenancy, and native WebAuthn/Passkey support.

### How do Keycloak and Authentik eliminate $3,000+/month Okta and Auth0 bills?
Commercial IAM vendors impose punishing pricing structures: Okta Workforce Identity charges $6-$15 per employee per month with hefty platform base fees ($18,000+/year for 200 users), while Auth0 charges up to $1,500/month for each enterprise SAML/OIDC custom connection add-on. Self-hosting Keycloak or Authentik on Kubernetes or an inexpensive VPS costs ~$120/month (-96.3% savings) with zero per-user seat taxes, unlimited enterprise SAML connections, and absolute control over sensitive user credentials and audit logs.