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Indie alternatives to Auth0

13 products made by independent developers and small teams that do what Auth0 does, 13 of them with a free plan. Free and open-source options come first.

At a glance

The alternatives

1. Authelia

Open-source single sign-on and 2FA portal for your apps

Authelia adds single sign-on, two-factor authentication and access control in front of self-hosted web apps via your reverse proxy, and can act as an OpenID Connect provider.

Free · Self-hosted · Website ↗

2. Keycloak

Open-source identity and access management

Keycloak is a self-hosted identity provider with single sign-on, OpenID Connect, SAML, LDAP integration and user federation.

Free · Self-hosted, Linux · Website ↗

3. authentik

Self-hosted identity provider and SSO

authentik is an open-source identity provider supporting OAuth2/OIDC, SAML, LDAP and proxy authentication, popular in homelabs.

Free plan · Self-hosted · Website ↗

4. Clerk

Drop-in authentication and user management for web apps

Clerk provides prebuilt sign-in components, user management, organizations and session handling for React, Next.js and other frameworks.

Free plan · Web, API · Website ↗

5. FusionAuth

Customer identity and auth you can run anywhere

FusionAuth is a downloadable or hosted CIAM platform with login, MFA, SSO and user management APIs.

Free plan · Web, Self-hosted, API · Website ↗

6. Hanko

Open-source passkey-first authentication

Hanko provides passkey and passwordless authentication with drop-in web components, hosted or self-hosted.

Free plan · Web, Self-hosted, API · Website ↗

7. Hexclave (formerly Stack Auth)

Open-source user authentication and management platform

Hexclave, formerly Stack Auth, is an open-source authentication and user-management platform with prebuilt components and a dashboard.

Free plan · Web, Self-hosted, API · Website ↗

8. Kinde

Auth, feature flags and billing for SaaS products

Kinde offers authentication, user management, feature flags and subscription billing for B2B and B2C apps.

Free plan · Web, API · Website ↗

9. Logto

Open-source auth and identity for SaaS and AI apps

Logto provides sign-in experiences, OIDC, multi-tenancy, RBAC and SSO, available as cloud or self-hosted.

Free plan · Web, Self-hosted, API · Website ↗

10. Ory

Open-source identity, login and permission services

Ory develops Kratos, Hydra, Keto and Oathkeeper for identity, OAuth2/OIDC and permissions, plus the managed Ory Network.

Free plan · Web, Self-hosted, API · Website ↗

11. SuperTokens

Open-source authentication for your app

SuperTokens offers prebuilt login UI, session management and auth recipes that you can self-host or use managed.

Free plan · Web, Self-hosted, API · Website ↗

12. WorkOS

Enterprise SSO, directory sync and auth APIs

WorkOS provides APIs for SAML/OIDC SSO, SCIM directory sync, audit logs and a hosted AuthKit login for B2B SaaS.

Free plan · Web, API · Website ↗

Questions

Is there a free alternative to Auth0?

Yes. 13 of the 13 indie alternatives listed here have a free plan or are free: Authelia, Keycloak, authentik, Clerk and 9 more.

Is there an open-source alternative to Auth0?

Authelia, Keycloak, authentik, Hanko and 5 more are open source.

Can I self-host an alternative to Auth0?

Yes: Authelia, Keycloak, authentik, FusionAuth and 6 more can run on your own server.

Which Auth0 alternatives work on Mac, Windows, iPhone or Android?

On Linux: Keycloak. On the web: Clerk, FusionAuth, Hanko and 7 more.

What makes these alternatives to Auth0 “indie”?

They are built by independent developers or small teams rather than large companies. Each one is listed because it does the same core job as Auth0.

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