TL;DR - Authelia
- Authelia is an open-source authentication server providing SSO and 2FA for applications
- It works as a reverse proxy companion to protect internal services with access control
- Completely free and open-source
Pricing: Free forever
Best for: Individuals & startups
Score: 80/100
Pricing Plans
Most Popular
Free
Free
Open source
- SSO/2FA
- Self-hosted
- LDAP/AD support
- Apache 2.0 license
About Authelia
Authelia provides authentication, single sign-on, and access control you can self-host. Add 2FA, SSO, and fine-grained permissions to applications that don't have them, all running on your infrastructure.
The reverse proxy integration model means existing applications don't need modification. Policies control who can access what based on users, groups, and network conditions.
Teams who need enterprise-grade identity features without cloud dependencies deploy Authelia as their authentication layer.
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Authelia FAQ
Yes, Authelia is open source and completely free. Apache 2.0 license. No paid version - community supported project.
Authelia is an open-source authentication server. Single sign-on and 2FA for your applications. Works as a reverse proxy companion for self-hosted apps.
Any web application behind a reverse proxy. Add SSO, 2FA, and access control to apps that don't have built-in auth. Popular for self-hosted services.
Keycloak is full IAM with OIDC provider. Authelia is simpler auth portal. Keycloak for enterprise SSO; Authelia for protecting self-hosted apps.
Sits behind your reverse proxy (Nginx, Traefik, Caddy). Intercepts requests and checks authentication. Supports TOTP, WebAuthn, and Duo for 2FA.