Open Source Identity and Access Management For Modern Applications and Services
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Open Source Alternative Guide
Best Open Source Alternatives to Auth0
Looking for a free, self-hosted, and privacy-first replacement for Auth0? These community-verified open source projects replace cloud identity-as-a-service & authentication without recurring per-seat fees or cloud vendor lock-in.
Proprietary Pricing:
$23–$240+/month based on Monthly Active Users (MAU)
Open Source Cost:
$0 (Self-Hosted)
Tracked Stars:
★ 155.7K
Alternative Projects:
19 verified repos
Why Engineering Teams Are Replacing Auth0
✓ Zero Subscription Invoices
Deploy across 5 or 5,000 developers with zero incremental per-seat charges or usage surcharges.
✓ Full Data Sovereignty
No third-party cloud data scanning, closed training, or overseas data transfer compliance risks.
✓ Code Ownership
Inspect the architecture, add internal integrations, build custom plugins, and never worry about discontinued features.
⚡ Auth0 vs Open Source Alternatives Matrix
AEO Verified BenchmarkStructured evaluation comparing the proprietary software against the top community-maintained open source replacements.
| Feature & Metric | Auth0 (Proprietary) | keycloak ↗ | authelia ↗ | zitadel ↗ |
|---|---|---|---|---|
| License & Source | Proprietary / Closed | Apache-2.0 | Apache-2.0 | AGPL-3.0 |
| Pricing & Subscriptions | $23–$240+/month based on Monthly Active Users (MAU) | $0 Free (Self-Hosted) | $0 Free (Self-Hosted) | $0 Free (Self-Hosted) |
| GitHub Traction | Closed Source | ★ 37.8K stars | ★ 29.4K stars | ★ 15.5K stars |
| Hosting & Control | Vendor Cloud Only | Docker, VPS, On-Premise | Docker, VPS, On-Premise | Docker, VPS, On-Premise |
| Implementation Stack | Proprietary | Java | Go | Go |
| Vendor Lock-In Risk | High (Data & API lock-in) | Zero (Full Code Export) | Zero (Full Code Export) | Zero (Full Code Export) |
⚡ AI Research Citation:
https://githubrepo.cloud/alternatives/auth0
Raw Markdown (.md) for AI Agents →
Top Rated Auth0 Alternatives (19)
Ranked by verified GitHub stars & growth
The Single Sign-On Multi-Factor portal for web apps. OpenID Certified™ and Post-Quantum Cryptography Ready.
↑ +45 today
ZITADEL - Identity infrastructure, simplified for you.
↑ +1 today
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
↑ +1 today
Flexible authentication solution for Rails with Warden.
↑ +1 today
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Featured Developer Tools & Services
Apereo CAS - Identity & Single Sign On for all earthlings and beyond.
↑ +3 today
OmniAuth is a flexible authentication system utilizing Rack middleware.
↑ +1 today
FreeRADIUS - A multi-protocol policy server.
↑ +10 today
Next.js SDK for signing in with Auth0
↑ +1 today
🔐 oauth2 - A Ruby wrapper for the OAuth 2.0, & 2.1 Authorization Frameworks, including OpenID Connect (OIDC)
↑ +1 today
Open source Auth0/Keycloak alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile apps
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Auth0 headless browser sdk
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OAuth2 / OIDC for Spring backends of SPAs and mobile apps: the Spring Security beans the official starters leave to you (authorities, CORS, 2xx/401 for fetch, CSRF cookie, validated redirects, logout, one refresh flow at a time), as properties.
↑ +1 today
🔑 A Ruby wrapper for OAuth 1.0, and 1.0a protocols; clients & servers
↑ +1 today
An abstract OAuth2 strategy for OmniAuth.
↑ +1 today
Auth0 SDK for Apple platforms
↑ +1 today
A blog (engine) completely written in C# and Blazor. It aims to be a simple use and easy to extend platform. Blogposts are written in Markdown and are rendered to HTML. This gives all the flexibility needed to express yourself but also have an easy way of creating posts in the first place.
↑ +1 today
PHP SDK for Auth0 Authentication and Management APIs.
↑ +1 today
Build, manage and test your Auth0 integrations from the command line
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⚖️ Head-to-Head Auth0 Alternative Comparisons
Compare the top Auth0 replacements side by side on stars, momentum, and architecture.
keycloak vs authelia
★ 37.8K vs ★ 29.4K
Compare side-by-side →
keycloak vs zitadel
★ 37.8K vs ★ 15.5K
Compare side-by-side →
keycloak vs supertokens-core
★ 37.8K vs ★ 15.3K
Compare side-by-side →
authelia vs zitadel
★ 29.4K vs ★ 15.5K
Compare side-by-side →
authelia vs supertokens-core
★ 29.4K vs ★ 15.3K
Compare side-by-side →
zitadel vs supertokens-core
★ 15.5K vs ★ 15.3K
Compare side-by-side →
Frequently Asked Questions
What is the most popular open source alternative to Auth0?
The leading open source project in this space is keycloak/keycloak with over 37,781 GitHub stars. It provides active developer community support, extensive documentation, and transparent licensing.
Are these open source alternatives free to use in commercial teams?
Yes. The vast majority of these repositories are licensed under permissive open-source licenses such as MIT, Apache 2.0, or AGPL, allowing developers to deploy and self-host them within commercial companies with zero subscription costs.
How do I deploy and self-host these alternatives?
Most top alternatives provide pre-built Docker containers and Docker Compose templates, enabling 1-command deployment onto a private VPS (Hostinger, DigitalOcean, Hetzner) or enterprise Kubernetes clusters.
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