The Best Open-Source Alternatives to WorkOS
Are you looking for a free or self-hosted alternative to WorkOS? In 2026, avoiding expensive proprietary software subscriptions is easier than ever. The open-source community has built excellent privacy-friendly tools within the Authentication ecosystem. Currently, there are 6 active replacements available, with Keycloak being one of the most prominent selections.
Quick Comparison: WorkOS vs. Open Source
Full comparison: WorkOS vs. Keycloak ā| Criteria | WorkOS | OSS Replacements |
|---|---|---|
| Pricing model | Paid / Monthly Fees | 100% Free / Self-Hosted |
| Data Control | Third-party Servers | Full Ownership & Privacy |
| Customizability | Restricted by Vendor | Unlimited (Modify Codebase) |
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Keycloak
Keycloak is an open-source identity and access management solution that enables secure, standards-based authentication and authorization for applications and services. By using Keycloak, developers can replace proprietary solutions like WorkOS with a free, highly customizable, and community-driven alternative that prioritizes user privacy and data control.
Authelia
Authelia is an open-source, scalable, and highly customizable authentication platform that provides secure, passwordless, and biometric MFA capabilities, making it an excellent alternative to commercial solutions like WorkOS. With its focus on user privacy and control, Authelia empowers developers to create seamless, secure, and consent-based authentication experiences for their users.
Ory Kratos
Ory Kratos is a comprehensive identity and API access management platform that empowers developers to securely authenticate and authorize users, while protecting their sensitive data and respecting user consent in a transparent and private manner. As a highly customizable and open-source alternative to WorkOS, Kratos provides unmatched flexibility and control for securing sensitive data and identities, making it an ideal choice for teams prioritizing data sovereignty and user privacy.
CAS Overlay
The CAS Overlay offers a centralized, open-source authentication platform, seamlessly integrating with existing systems while prioritizing user data protection and flexibility, making it an ideal alternative to proprietary solutions like WorkOS. By utilizing CAS Overlay, developers can securely manage identities and streamline user authentication without compromising on transparency or scalability.
Authlib is an extensible, open-source library for authentication in web applications, providing a robust set of authentication strategies to safeguard user data and enable secure sessions, serving as a reliable and privacy-friendly alternative to proprietary solutions like WorkOS. With Authlib, developers can easily integrate authentication logic into their applications while maintaining full control over user data and minimizing reliance on third-party services.
Gluu's oxAuth is a cutting-edge, open-source authentication and authorization server that empowers developers to build secure, identity-driven applications while safeguarding user privacy and data control. By offering a customizable, API-driven alternative to proprietary solutions like WorkOS, oxAuth allows organizations to maintain ownership and control over their identity infrastructure, fostering a future-proof, trust-based relationship with their customers.
Frequently Asked Questions
What is the best open source alternative to WorkOS?
Based on GitHub community data (including star count and fork activity), Keycloak stands out as one of the most reliable open-source replacements for WorkOS today.
Why should I use an open-source replacement instead of WorkOS?
Switching to an open-source solution ensures complete data sovereignty, protects your software environment from sudden vendor price hikes, and gives you full transparent control over your tech-stack metadata.