Open Source Clerk Alternatives
Add authentication without per-user fees. Open source Clerk alternatives for sign-up flows, user profiles, and session management you control.
Clerk simplifies adding authentication and user management to applications, particularly those built with React, Next.js, and Remix. It offers pre-built UI components and backend infrastructure to handle user registration, login, profile management, and more. However, developers sometimes look for open source alternatives to avoid relying on a proprietary SaaS solution and maintain greater control over their user data and authentication processes.
Key features of Clerk include easily integrated UI components, streamlined user authentication flows, and robust account management. It supports features like multi-factor authentication (MFA), organization management, and customizable branding. While powerful and convenient, the closed-source nature of Clerk can be a drawback for teams prioritizing self-hosting or deep customization. This leads to exploring alternatives offering more flexibility.
Common use cases for Clerk include building user logins and registration in web apps, managing user profiles and permissions, implementing secure authentication workflows, and handling complex organization structures. However, many developers may prefer self-hosted solutions for compliance reasons or to avoid ongoing subscription costs. Finding a suitable open source alternative allows them to achieve similar functionality with greater control and transparency.
Open Source Alternatives
authentik
The self-hosted Identity Provider that replaces Okta, Auth0, and Entra ID with a unified SSO platform supporting SAML, OAuth2/OIDC, LDAP, RADIUS, and WebAuthn.
authentik
OtherSuperTokens
Authentication · Security
Open-source authentication platform you self-host, giving you complete control over user data with zero vendor lock-in.
SuperTokens
OtherZITADEL
Authentication
Open-source, API-first identity platform delivering multi-tenancy, Passkeys, OIDC, SAML, and SCIM without vendor lock-in.
ZITADEL
AGPL 3.0Logto
Open-source auth infrastructure for SaaS and AI apps with OIDC, SAML, and RBAC
Logto
MPL 2.0Hanko
Security · Authentication
Open source, self-hostable authentication platform with passkeys, SAML SSO, and OAuth — the privacy-first alternative to Auth0 and Clerk.
Hanko
OtherHexclave
Developer Tools · Authentication
The open-source user infrastructure platform — authentication, teams, payments, emails, analytics, and more on a single unified user model.
Hexclave
OtherVoidAuth
Security · Authentication
Self-hosted SSO with OIDC, LDAP, passkeys, and proxy auth for your entire self-hosted stack
VoidAuth
AGPL 3.0Authgear
Authentication
Open-source, self-hostable authentication platform with passkeys, biometric login, SSO, MFA, and GraphQL admin API — a full Auth0/Clerk/Firebase alternative for SaaS and mobile apps.