Keycloak

✓ Verified FOSSApache-2.0

Top open-source alternative to Auth0 / Okta

⭐ 37,316 Stars Official Website ↗

Open Source Identity and Access Management For Modern Applications and Services

Tech StackJava, Quarkus

Self-Host DifficultyMedium

License ModelApache-2.0

GitHub Repositorykeycloak/keycloak

Recommended VPS & Hardware Sizing

Estimated Hosting: $10 - $15/mo (e.g. Hetzner CPX21 or Linode)

Min RAM:2 GB

Rec RAM:4 GB

Compute:2 vCPU

Disk Space:25 GB SSD

Keycloak vs Auth0 / Okta Comparison Matrix

Evaluation Criteria	Keycloak (Open Source)	Auth0 / Okta (Proprietary)
Monthly Active Users (MAU)	Unlimited MAU with zero per-user fee	Billed aggressively per MAU above 7k
Enterprise Federation	Native LDAP, Kerberos, Active Directory	Enterprise add-on pricing tier required
Deployment Model	On-premise bare-metal or Kubernetes	Multi-tenant cloud service only

INTERACTIVE TCO MODELEstimated Rate: $138/user/mo

Financial Impact: Migrating from Auth0 / Okta to Self-Hosted Keycloak

Detailed Stack Calculator →

Active Team Members / Seats: 25 Users

5 Users (Early Startup)50 Users (Scaleup)200 Users (Enterprise Org)

Auth0 / Okta (Cloud SaaS)Per-Seat Tax

$41,400per year ($3,450/mo)

3-Year Spend:$124,200

* Excludes enterprise SSO add-ons & usage overages

Keycloak (Self-Hosted)Zero Per-Seat Fee

$120per year ($10/mo Linux VPS)

3-Year Compute:$360

* Commodity Hetzner / DigitalOcean compute instance

Cumulative 3-Year ROI+$123,840Net savings across 36 months (100% reduction)

Annual Free Cash:+$41,280/yr

Need C-Level Buy-In? Generate an instant ROI proposal memo to present to your CTO or CFO.

HEAD-TO-HEAD BATTLES // SIDE-BY-SIDE AUDIT

Compare Keycloak Head-to-Head

Custom Comparison Engine →

★ PRIMARY REPLACEMENTFOSS vs SaaS

Keycloakvs

Auth0 / Okta

Comprehensive benchmark comparing Keycloak against proprietary Auth0 / Okta licensing and features.

View Full Battle Report→

SecurityPEER BENCHMARK

Keycloakvs

Authentik

RedHat Enterprise IAM vs Modern Python/Go Identity Provider

Inspect Comparison→

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Vaultwardenvs

1Password

Bitwarden-Compatible Lightweight Rust Server vs 1Password SaaS

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Infisicalvs

HashiCorp Vault

Developer-First Secret Management & Sync vs Complex Enterprise HSM Vault

Inspect Comparison→

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Headscalevs

Tailscale

Self-Hosted Control Server vs Tailscale Cloud Coordination Service

Inspect Comparison→

SecurityPEER BENCHMARK

Headscalevs

NetBird

Lightweight Headscale Coordination vs Full-Featured Zero-Trust Network

Inspect Comparison→

Core Capabilities & Features

✓SSO & Social Login

✓OpenID Connect & SAML 2.0

✓LDAP & Active Directory Sync

✓Two-Factor Auth (2FA / TOTP)

Self-Host Keycloak with Docker Compose

Tweak configuration ports, secrets, and volumes live. Download or copy your ready-to-run container file:

1-Click Docker Compose Generator

Generate production-ready container definitions with customizable ports and volumes.

Select Open-Source Project:

KeycloakApache-2.0

Open-source Identity and Access Management for modern applications

Difficulty: Medium37,316 ⭐

Configure Parameters

Keycloak HTTP Port (PORT)

Admin Username (ADMIN_USER)

Admin Password (ADMIN_PASSWORD)

docker-compose.keycloak.yml

version: '3.8'
services:
  keycloak:
    image: quay.io/keycloak/keycloak:latest
    command: start-dev
    environment:
      KEYCLOAK_ADMIN: ${ADMIN_USER:-admin}
      KEYCLOAK_ADMIN_PASSWORD: ${ADMIN_PASSWORD:-admin_pwd}
    ports:
      - "${PORT:-8080}:8080"

Frequently Asked Questions: Self-Hosting Keycloak

How do I self-host Keycloak using Docker Compose?

You can deploy Keycloak (keycloak/keycloak) on any Linux server by copying the docker-compose.yml template on this page, configuring your desired host port and persistent volume directory, and running 'docker compose up -d'.

How does Keycloak compare to Auth0 / Okta?

Keycloak is an open-source, self-hosted alternative to Auth0 / Okta built with Java, Quarkus. Unlike Auth0 / Okta ($35 - $240+ / month (Penalties on MAU)), Keycloak has zero per-user licensing fees and keeps 100% of your data on your own infrastructure.

What are the minimum VPS RAM and CPU requirements for Keycloak?

For production self-hosting (Medium difficulty tier), we recommend at least 4 GB RAM (minimum 2 GB), 2 vCPU, and 25 GB SSD storage, which typically costs $10 - $15/mo (e.g. Hetzner CPX21 or Linode).

Is Keycloak free for commercial business use under the Apache-2.0 license?

Yes. Distributed under the Apache-2.0 license, Keycloak can be self-hosted internally by businesses and engineering teams of any size without per-seat royalties.

README INTEGRATION // REPO EMBED

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