The Best Open-Source Alternatives to Okta
Are you looking for a free or self-hosted alternative to Okta? 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: Okta vs. Open Source
Full comparison: Okta vs. Keycloak ā| Criteria | Okta | 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) |
Sort alternatives
Choose the metric that should define the list order.
Keycloak
Keycloak is an open-source identity and access management solution that provides secure authentication, authorization, and single sign-on capabilities, serving as a comprehensive alternative to proprietary solutions like Okta. With Keycloak, organizations can maintain control and autonomy over their user identities while ensuring the highest level of security, compliance, and data privacy.
Casdoor
Casdoor is an open-source unified identity management platform that enables secure single sign-on, multi-factor authentication, and authorization, making it an excellent alternative to proprietary identity management services like Okta. With Casdoor, organizations can achieve strong identity governance and manage user access while maintaining complete control over their sensitive data.
cas
Central Authentication Service (CAS) is a widely-used, open-source single sign-on (SSO) solution that enables users to access multiple applications and services with a single login, while prioritizing user identity control and data protection. As a highly customizable and transparent alternative to commercial SSO providers like Okta, CAS ensures that organizations can manage user authentication in a secure, private, and community-driven manner.
OpenAM is a highly scalable, open-source identity management platform that offers a robust alternative to proprietary solutions like Okta, empowering users to manage access, authentication, and authorization for their applications and services while maintaining complete control over their data. By leveraging OpenAM, organizations can enjoy seamless integration, enhanced security, and unparalleled flexibility in their identity management strategy, free from vendor lock-in.
Gluu (previously known as OxTrust) is an open-source identity and access management (IAM) solution that securely connects users to applications and resources across multiple environments, offering a robust alternative to proprietary solutions like Okta. As a community-driven and self-hosted platform, Gluu prioritizes user control and data sovereignty, enabling organizations to maintain full custody of their sensitive information, ensuring a higher level of privacy and compliance with regulatory requirements.
IdentityServer is a comprehensive, open-source identity and access control server that enables secure authentication, authorization, and API protection for modern applications, providing a flexible, customizable alternative to proprietary solutions like Okta. By leveraging IdentityServer, developers can build robust, privacy-friendly authentication systems that maintain user control over personal data.
Frequently Asked Questions
What is the best open source alternative to Okta?
Based on GitHub community data (including star count and fork activity), Keycloak stands out as one of the most reliable open-source replacements for Okta today.
Why should I use an open-source replacement instead of Okta?
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.