Keycloak vs Authentik: Enterprise Identity Platforms Compared
Keycloak vs Authentik: Enterprise Identity Platforms Compared
The two heavyweights of open source identity management. Keycloak is the battle-tested enterprise standard backed by Red Hat. Authentik is the modern alternative with a better UX and growing feature set. Both handle SAML, OIDC, LDAP, and MFA — the differences are in architecture, admin experience, and deployment philosophy.
Quick Verdict
Choose Keycloak for maximum enterprise compatibility — SAML, LDAP federation, Active Directory, Kerberos, and the largest ecosystem. Choose Authentik for modern UX, easier setup, and a more developer-friendly experience without sacrificing enterprise features.
The Comparison
| Feature | Keycloak | Authentik |
|---|---|---|
| Language | Java (Quarkus) | Python (Django) + Go |
| OIDC/OAuth 2.0 | ✅ | ✅ |
| SAML 2.0 | ✅ (most complete) | ✅ |
| LDAP | ✅ Federation + outbound | ✅ LDAP outpost |
| Active Directory | ✅ (best support) | ✅ |
| Kerberos | ✅ | ❌ |
| Social login | ✅ | ✅ |
| MFA/2FA | ✅ | ✅ |
| Passkeys/WebAuthn | ✅ | ✅ |
| Passwordless | ✅ | ✅ |
| SCIM | ❌ (extension) | ✅ |
| Proxy auth | ❌ | ✅ (outpost) |
| Admin console | Functional but dated | ✅ Modern, clean |
| Flow builder | ✅ (drag-and-drop) | ✅ (visual, more intuitive) |
| Multi-tenancy | Realms | Tenants |
| Identity brokering | ✅ (best) | ✅ |
| Custom themes | FreeMarker templates | Customizable flows |
| User federation | ✅ (best) | ✅ |
| Fine-grained authz | ✅ (UMA, policies) | Basic RBAC |
| Kubernetes | ✅ (Operator) | ✅ (Helm) |
| RAM usage | 2-4 GB minimum | 1-2 GB |
| Stars | 24K+ | 14K+ |
| License | Apache 2.0 | MIT (source-available) |
When to Choose Keycloak
- Enterprise environments with SAML, LDAP, Active Directory, Kerberos
- Regulated industries (government, healthcare, finance)
- Complex authorization requirements (UMA, fine-grained policies)
- Identity brokering across multiple IdPs
- Java ecosystem is familiar to your team
- You need the most battle-tested, widely-deployed option
- Red Hat support (RHSSO) is available or desired
When to Choose Authentik
- Modern admin UX is important (your team will use it daily)
- Proxy authentication for legacy apps (outpost model)
- SCIM provisioning is needed
- Lighter resource footprint matters (half the RAM of Keycloak)
- Python/Django ecosystem is familiar
- Faster initial setup is preferred
- You want visual flow-based authentication design
- Blueprints for reproducible, version-controlled configurations
Architecture Differences
Keycloak runs as a standalone Java application (Quarkus). It handles everything internally — authentication, authorization, user federation, session management. Clients connect directly to Keycloak for auth flows.
Authentik uses a split architecture — a Django core handles the admin interface, flows, and policies, while Go-based outposts handle the actual authentication proxy. This means Authentik can sit in front of apps that don't support OIDC/SAML natively.
The Outpost Advantage
Authentik's outpost proxy is its killer feature for many teams. It lets you add authentication to any web application — even legacy apps with no auth support — by putting an Authentik outpost in front of it. Keycloak requires applications to implement OIDC/SAML themselves.
Setup Comparison
Keycloak:
docker run -p 8080:8080 \
-e KC_BOOTSTRAP_ADMIN_USERNAME=admin \
-e KC_BOOTSTRAP_ADMIN_PASSWORD=admin \
quay.io/keycloak/keycloak:latest start-dev
Authentik:
# docker-compose.yml with PostgreSQL + Redis
wget https://goauthentik.io/docker-compose.yml
echo "PG_PASS=$(openssl rand 36 | base64)" >> .env
echo "AUTHENTIK_SECRET_KEY=$(openssl rand 60 | base64)" >> .env
docker compose up -d
Keycloak is quicker for a dev instance (single container). Authentik requires PostgreSQL and Redis but provides a more production-ready default setup.
Resource Usage
| Metric | Keycloak | Authentik |
|---|---|---|
| Minimum RAM | 2 GB | 1 GB |
| Recommended RAM | 4 GB | 2 GB |
| Containers | 1 (+ database) | 3 (server + worker + database) |
| Database | PostgreSQL/MySQL/H2 | PostgreSQL |
| Cache | Infinispan (built-in) | Redis (required) |
| Startup time | 30-60 seconds | 10-20 seconds |
The Bottom Line
Keycloak is the safe enterprise choice — it handles every identity protocol, has the largest community, and is backed by Red Hat. If you're in a regulated industry or need SAML/LDAP federation with Active Directory, Keycloak is proven.
Authentik is the modern alternative — better admin UX, lighter resource usage, and the outpost proxy model that solves real problems Keycloak doesn't address. If you're building a cloud-native stack and want identity management that feels contemporary, Authentik delivers.
For greenfield projects, Authentik is increasingly the better default. For enterprises with existing SAML/LDAP infrastructure, Keycloak remains the standard.
Compare identity platforms on OSSAlt — protocol support, deployment complexity, and community health side by side.