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.
What Clerk Offers
UI Components
Drop-in UI components for authentication, profile management, and other user flows speed up development time.
Multi-Factor Authentication (MFA)
Clerk offers built-in MFA to enhance the security of user accounts and protect against unauthorized access.
Organization Management
Tools to manage organizations, teams, and user permissions within applications.
Customizable Branding
Adapt the look and feel of Clerk's components to match your application’s design with custom CSS.
Common Use Cases
Web Application Authentication
Adding user login and registration functionality to web applications built with modern JavaScript frameworks.
User Profile Management
Managing user profiles, settings, and preferences within an application.
Secure Authentication Workflows
Implementing secure authentication processes including password resets and account recovery.
Multi-Tenant Applications
Managing multiple organizations or teams within a single application instance.
Open Source Alternatives
authentik
Authentication · Security
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.
SuperTokens
Authentication · Security
Open-source authentication platform you self-host, giving you complete control over user data with zero vendor lock-in.
ZITADEL
Authentication
Open-source, API-first identity platform delivering multi-tenancy, Passkeys, OIDC, SAML, and SCIM without vendor lock-in.
Logto
Authentication
Open-source auth infrastructure for SaaS and AI apps with OIDC, SAML, and RBAC
Ory Kratos
Authentication
API-first identity and user management that handles login, registration, MFA, and recovery so your application never has to.
Hanko
Security · Authentication
Open source, self-hostable authentication platform with passkeys, SAML SSO, and OAuth — the privacy-first alternative to Auth0 and Clerk.
Hexclave
Developer Tools · Authentication
The open-source user infrastructure platform — authentication, teams, payments, emails, analytics, and more on a single unified user model.
Authgear
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.
