Auth0
5 alternatives — 3 medium, 2 hard
Why people leave Auth0
- Expensive per-user pricing at scale
- Complex pricing tiers
- Vendor lock-in with proprietary auth flows
- Data stored on Auth0 servers
Comparison
| App | Difficulty | RAM | Docker | Mobile | Status | |
|---|---|---|---|---|---|---|
| Authelia Open-source authentication and authorization server providing SSO and 2FA for your apps. | medium | 0.25GB | — | — | Active | |
| Authentik Identity provider and SSO solution with a modern UI for managing users and access policies. | medium | 2GB | — | Active | ||
| Keycloak Mature open-source identity and access management for OIDC, SAML, SSO, and user federation. | hard | 2GB | — | Active | ||
| Logto Developer-focused authentication and authorization platform for SaaS and AI apps. | medium | 1GB | — | Active | ||
| ZITADEL Modern self-hostable identity platform with OIDC, SAML, passkeys, MFA, and multi-tenancy. | hard | 2GB | — | Active |
Detailed Look
Authelia Top Pick
Open-source authentication and authorization server providing SSO and 2FA for your apps.
Pros
- + Single sign-on for all your apps
- + Supports TOTP and WebAuthn 2FA
- + Lightweight Go binary
- + Works with Traefik and Nginx
Cons
- - Configuration is YAML-heavy and complex
- - No built-in user management UI
- - Requires a reverse proxy
- - Documentation assumes prior auth knowledge
Authentik
Identity provider and SSO solution with a modern UI for managing users and access policies.
Pros
- + Beautiful admin UI
- + LDAP SAML and OIDC support
- + Built-in user management
- + Customizable login flows
Cons
- - Resource heavy for an auth server
- - Python-based with many dependencies
- - Complex flow system has learning curve
- - Enterprise features require paid plan
Keycloak
Mature open-source identity and access management for OIDC, SAML, SSO, and user federation.
Pros
- + Very mature IAM platform with broad protocol support
- + Strong fit for organizations replacing hosted identity providers
- + Large ecosystem and extensive documentation
Cons
- - Heavyweight for small homelabs
- - Realm, client, and flow configuration has a learning curve
- - Upgrades need planning in production
Logto
Developer-focused authentication and authorization platform for SaaS and AI apps.
Pros
- + Developer-friendly OIDC and OAuth app authentication
- + Good UI for tenant, app, and role management
- + Easier to approach than Keycloak for many SaaS use cases
Cons
- - Younger ecosystem than Keycloak
- - Some enterprise features may be tied to hosted/paid editions
- - Not a replacement for network-level SSO by itself
ZITADEL
Modern self-hostable identity platform with OIDC, SAML, passkeys, MFA, and multi-tenancy.
Pros
- + Modern IAM feature set with passkeys and multi-tenancy
- + Good fit for SaaS and application authentication
- + Cleaner developer experience than older IAM stacks
Cons
- - More complex than reverse-proxy auth tools
- - Operational model is heavier than a simple OIDC provider
- - Smaller community than Keycloak
Can't decide? Compare Authelia, Authentik, Keycloak side by side →