Best Open Source Alternatives to Okta & Auth0
Self-hosted Single Sign-On (SSO), OAuth2, OIDC, and multi-factor authentication brokers with transparent cryptographic security.
Why Migrate from Okta & Auth0?
Okta and Auth0 have experienced prominent security breaches and extortion events compromising customer support portals and source repositories. Additionally, their per-monthly-active-user (MAU) pricing creates severe budget shocks as user bases grow. Self-hosted IAM systems give security teams complete perimeter control, audited audit logs, and predictable zero-cost scaling.
Key Risks & Constraints
Operational and financial risks of continuing to rely on Okta:
- ⚠High-profile breach history exposing administrative consoles and customer session tokens
- ⚠Exorbitant monthly-active-user (MAU) licensing pricing penalizing consumer user growth
- ⚠Vendor dependency for critical authentication pathways—outages lock out all downstream apps
- ⚠Compliance hurdles storing employee and customer identity databases in commercial multi-tenant clouds
Vetted Open-Source Replacements
Ranked by SafeOpenSource composite safety scores, dependency audits, and community vitality.
Authelia
password-authAuthelia
authelia/autheliaLightweight authentication and authorization server providing two-factor authentication and single sign-on.
Keycloak
password-authKeycloak
keycloak/keycloakOpen-source identity and access management solution for modern enterprise applications.
Authentik
password-authAuthentik
goauthentik/authentikModern identity provider focused on flexibility, integration, and security protocols.
Head-to-Head Safety & Specification Comparison
Direct technical specifications and supply-chain metrics for open-source replacements to Okta & Auth0.
| Tool | Safety Score | Verdict | License | Language | Self-Host Difficulty | Stars | Audit |
|---|---|---|---|---|---|---|---|
 Autheliaauthelia/authelia | 93.1/100 | Healthy | Apache-2.0 | Go | Medium | 29,575 | Report → |
 Keycloakkeycloak/keycloak | 92.6/100 | Healthy | Apache-2.0 | Java | Advanced | 37,730 | Report → |
 Authentikgoauthentik/authentik | 90.7/100 | Healthy | GPL-3.0-only | Python / Go | Medium | 26,252 | Report → |
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