Open-source alternatives guide · Updated 2026
Compare the best free and open-source alternatives to Auth0 — 14 verified projects with explicit catalog relationships. Inspect licenses, GitHub activity, self-hosting signals, and migration fit before you switch.
Official product reference Auth0↗Only explicit alternative relationships are shown—never inferred competitor claims.
This guide compares 14 verified open-source alternatives to Auth0, including Keycloak, Better Auth, Authelia, and Authentik.
Projects appear across Infrastructure, Security & Privacy, and AI & Machine Learning. 4 options include a self-hosting signal — see the self-hosted catalog. Ranking follows public GitHub stars and recorded momentum—not vendor marketing. Compare projects side by side, then confirm license fit, migration effort, and operational ownership before adopting any option.
Strongest repository-activity signal: Keycloak · Jump to ranking · 35.7K stars
Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia, Ory, and Zitadel.
Visit Auth0Compare capabilities, licensing, and ownership model. Stars help with discovery; they are not a security or product-fit guarantee.
Open Source Identity and Access Management For Modern Applications and Services
Open Source Identity and Access Management For Modern Applications and Services Review the official repository, license, release activity, and deployment documentation before produ
Open-source alternative to Auth0
The most comprehensive authentication framework
The most comprehensive authentication framework Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Auth0
Open-source authentication and authorization server providing SSO, 2FA, and access control for self-hosted apps.
Authelia is a popular auth portal for homelab and small-team self-hosting: SSO, 2FA, and forward-auth integration with reverse proxies. Choose it when you want a focused login gate
The authentication glue you need.
The authentication glue you need. Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Auth0
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
Open source alternative to Auth0 / Firebase Auth / AWS Cognito Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Auth0
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC. Review the official repository, license,
Open-source alternative to Auth0
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Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Fa
Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, So
Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch.
Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch. Review the official repository, license, release activity, and deployment documentati
Open-source alternative to Auth0
The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.
The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else. Review the official repository, license, release activity, and d
Open-source alternative to Auth0
An open-source authorization as a service inspired by Google Zanzibar, designed to build and manage fine-grained and scalable authorization systems for any application. — Permify is now part of FusionAuth 🎉
An open-source authorization as a service inspired by Google Zanzibar, designed to build and manage fine-grained and scalable authorization systems for any application. — Permify i
Open-source alternative to Auth0
Cerbos is the open core, language-agnostic, scalable authorization solution that makes user permissions and authorization simple to implement and manage by writing context-aware access control policies for your applicati
Cerbos is the open core, language-agnostic, scalable authorization solution that makes user permissions and authorization simple to implement and manage by writing context-aware ac
Open-source alternative to Auth0
Open source Auth0/Clerk/Firebase alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile apps
Open source Auth0/Clerk/Firebase alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile apps Review the official r
Open-source alternative to Auth0
Open source auth infrastructure for B2B SaaS
Open source auth infrastructure for B2B SaaS Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Auth0
Integrated identity management with Linux/UNIX authentication, Kerberos, LDAP, DNS, and certificate services.
FreeIPA provides centralized Linux identity management (LDAP, Kerberos, DNS, certificates). It is closer to an enterprise directory than a developer OAuth SaaS—evaluate it for flee
Map must-have capabilitiesList the workflows in Auth0 you cannot drop during migration.
Verify the licenseConfirm it fits your use, distribution, and compliance model. Browse license briefs.
Run a proof of conceptTest real data, integrations, clients, and failure modes. Use Compare for side-by-side checks.
Plan ownershipAssess upgrades, backups, support, and an exit path. Read when self-hosting is worth it.
OpenSourceChoice currently lists 14 projects with an explicit alternative relationship to Auth0. Catalog highlights include Keycloak, Better Auth, and Authelia. Rankings follow public GitHub stars and recorded momentum—not paid placement. Match capabilities and license fit to your workflow before adopting any option.
Most catalogued alternatives publish source under OSI or source-available licenses and are free to inspect. Hosting, commercial support, or cloud model APIs may still cost money. Always read the project license for your use case.
4 options in this list carry a self-hosting signal. Confirm the official install guide, backups, upgrades, and hardening steps before production.
Map must-have Auth0 workflows, verify license and compliance fit, run a proof of concept with real data and integrations, then plan ownership for upgrades, backups, support, and an exit path.
Narrow the same alternatives by search, license, tags, or self-hosting signals when you need a tighter shortlist.
United StatesApache-2.0Open Source Identity and Access Management For Modern Applications and Services
InfrastructureOpen-source projects grouped in this category for discovery and comparison.#
JavaProjects tagged with this topic in the verified catalog.
Github ActionsProjects tagged with this topic in the verified catalog.
JavaScriptProjects tagged with this topic in the verified catalog.
Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…The most comprehensive authentication framework
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#
TypeScriptProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Open-source authentication and authorization server providing SSO, 2FA, and access control for self-hosted apps.
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#
GoProjects tagged with this topic in the verified catalog.
OIDCProjects tagged with this topic in the verified catalog.securityProjects tagged with this topic in the verified catalog.Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…The authentication glue you need.
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#
PythonProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Open source alternative to Auth0 / Firebase Auth / AWS Cognito
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#JavaProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.#TypeScriptProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.AI-nativeThis project includes AI-native capability signals in the catalog metadata.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Fa
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch.
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.
Business SoftwareOpen-source projects grouped in this category for discovery and comparison.#TypeScriptProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…An open-source authorization as a service inspired by Google Zanzibar, designed to build and manage fine-grained and scalable authorization systems for any application. — Permify is now part of FusionAuth 🎉
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Cerbos is the open core, language-agnostic, scalable authorization solution that makes user permissions and authorization simple to implement and manage by writing context-aware access control policies for your applicati
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…Open source Auth0/Clerk/Firebase alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile apps
Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.Auth0Proprietary identity platform (SSO, OAuth, user management). Open alternatives include Keycloak, authentik, Authelia,…
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