Open Source Alternatives
Alternatives to Auth0
Identity and access management platform.
Auth0 is a trademark of its respective owner.
Updated May 2026
What you gain
- ✓No per-MAU pricing that scales into thousands per month
- ✓Full control over authentication flows and session management
- ✓No external dependency for user login (your auth, your uptime)
- ✓Self-hosted deployment for data sovereignty and compliance
What you give up
- △No Universal Login with 70+ social connection prebuilts
- △No Auth0 Actions for serverless post-login/registration hooks
- △No Attack Protection with breached password detection
- △No Organizations feature for B2B multi-tenant auth
Switching Cost
Auth0 migration is straightforward if you only use email/password. Export users, import into your new system, done. It gets ugly when you've built on top of Auth0 Rules, Actions, or custom social connections. Those are proprietary logic that needs rewriting. SAML and enterprise SSO configurations need to be rebuilt per-customer. Budget a weekend for basic setups, 2-4 weeks for enterprise deployments with multiple tenants and custom flows.
| Authentik | ZITADEL | SuperTokens | |
|---|---|---|---|
| Overlap | 80% | 80% | 78% |
| Migration | moderate | moderate | moderate |
| License | MIT + Enterprise | GNU Affero General Public License v3.0 | Apache License 2.0 |
| Best for | Teams with DevOps | Small teams | Small teams |
We find the alternatives so you don't have to
Open source analysis in your inbox every Wednesday.
Drop-in Replacements
Ranked by feature coverage
Authentik
8180% coverageFlexible identity provider
SSO (single sign-on), multi-factor auth, user directories, all in one place. The open source version is extremely capable.
ZITADEL
7380% coverageIdentity infrastructure, simplified
ZITADEL is a self-contained identity platform: login, signup, SSO, multi-factor auth, user roles, all in one. It's an alternative to Auth0 or Clerk that you can self-host for free.
SuperTokens
8178% coverageOpen source alternative to Auth0/Firebase Auth/Cognito
SuperTokens is the open source authentication platform: signup, password reset, social login, multi-factor auth, without Auth0 prices or Firebase lock-in. It handles session management, email verification, passwordless login, and social OAuth out of the box.
Logto
7678% coverageAuth infrastructure for SaaS and AI apps
Logto is an auth platform you can self-host for free or use their cloud: login, signup, SSO, MFA, and user management for SaaS apps. Drop in their SDK, get a polished login experience, manage users through their admin console, done.
Ory Kratos
8575% coverageHeadless cloud-native identity management
Ory Kratos is a headless identity server that handles login, registration, password recovery, and account management without depending on Auth0. It handles the backend logic: password hashing, session management, MFA, social sign-in, and you build whatever frontend you want on top of its API.
authorizer
6770% coverageYour data, your control. Fully open source, authentication and authorization. No lock-ins. Deployment in Railway in 120 seconds || Spin a docker image as a micro-service in your infra. Built in login page and Admin panel out of the box.
Authorizer is a self-hosted auth server that replaces Auth0, Firebase Auth, or Supabase Auth. Bring your own database (Postgres, MySQL, SQLite, MongoDB, and 7 more), deploy it, and own every byte of user data.
Building Blocks
Auth0 is a platform. It bundles multiple capabilities into one subscription. These tools each cover one piece. Teams often assemble 2–3 of them instead of paying for the full suite.
AWS Cognito