Open Source Auth0 Alternatives
Secure authentication without per-user pricing. Open source Auth0 alternatives for SSO, MFA, passwordless login, and user management you own.
Auth0 simplifies the process of adding secure login and user management to applications. It handles crucial tasks like registration, password resets, multi-factor authentication, and user profile management, allowing developers to focus on building their core product. While powerful, Auth0’s commercial nature and vendor lock-in can be drawbacks for some projects. Users often seek open source alternatives to maintain greater control over their data, avoid recurring costs, and customize the platform more extensively.
The core value proposition of Auth0 lies in its comprehensive suite of features. Universal Login, Single Sign-On (SSO), and robust security protocols like Multi-Factor Authentication are key draws. However, the need for customization and self-hosting can drive developers to explore alternatives that offer more flexibility. Furthermore, concerns regarding data privacy and compliance may lead users to prefer the transparency of open source solutions.
Use cases for Auth0 are diverse, spanning from securing web and mobile applications to enabling authentication in APIs and microservices. Increasingly, Auth0 is being used to secure AI agents, which necessitates strong identity and access controls. However, for projects with specific security requirements or limited budgets, finding a self-managed open source Auth0 alternative is often desired.
What Auth0 Offers
Universal Login
Provides a customizable login experience across various devices and platforms, streamlining user access.
Single Sign-On (SSO)
Enables users to log in once and access multiple applications, enhancing user convenience and security.
Multi-Factor Authentication (MFA)
Adds an extra layer of security by requiring users to verify their identity through multiple methods.
Actions
Allows developers to customize the authentication pipeline with custom scripts and integrations.
Common Use Cases
Web Application Authentication
Securing user access to web applications with features like registration, login, and password management.
Mobile App Authentication
Providing secure authentication for native mobile applications on iOS and Android.
API Security
Protecting APIs with authentication and authorization mechanisms to control access to sensitive data.
AI Agent Security
Securing access to AI agents and controlling user permissions for interacting with them.
Open Source Alternatives
Authelia
Security · Authentication
OpenID Certified SSO and MFA portal for securing self-hosted web applications behind reverse proxies.
SuperTokens
Authentication · Security
Open-source authentication platform you self-host, giving you complete control over user data with zero 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.
SpiceDB
Security · Authentication · Databases
An open source, Google Zanzibar-inspired authorization database that models permissions as relationships and evaluates fine-grained access checks at massive scale with single-digit millisecond latency.
Hexclave
Developer Tools · Authentication
The open-source user infrastructure platform — authentication, teams, payments, emails, analytics, and more on a single unified user model.
VoidAuth
Security · Authentication
Self-hosted SSO with OIDC, LDAP, passkeys, and proxy auth for your entire self-hosted stack
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.
