The Best Open-Source Alternatives to OneLogin
Are you looking for a free or self-hosted alternative to OneLogin? 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: OneLogin vs. Open Source
Full comparison: OneLogin vs. Keycloak →| Criteria | OneLogin | 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 securely authenticates users, provides role-based authorization, and simplifies application integration through its robust RESTful API and OpenID Connect adapters, offering a highly customizable alternative to cloud-based solutions like OneLogin. With Keycloak, organizations can maintain control and data ownership, ensuring enhanced privacy and security for their users.
ory/hydra
Ory Hydra is a modern, open-source, decentralized Identity and OAuth service that enables secure, scalable authentication and authorization for applications, eliminating the need for vendor lock-in and providing greater data control for users. As a privacy-friendly alternative to OneLogin, Ory Hydra empowers developers and organizations to manage identities securely and transparently, aligning with the principles of ownership and control that open-source projects embody.
CAS
CAS (Central Authentication Service) is an open-source identity management platform that provides a secure, customizable, and privacy-friendly alternative to single sign-on solutions like OneLogin, allowing organizations to manage user authentication and authorization with full control over data. With CAS, organizations can maintain user identity and access control while adhering to stringent data protection regulations and preferences.
OpenAM is a comprehensive open-source Identity and Access Management (IAM) solution that provides secure authentication, authorization, and federation capabilities for modern applications, serving as a reliable and transparent alternative to proprietary SSO solutions like OneLogin. With its modular design and community-driven development, OpenAM offers unparalleled flexibility, security, and user control, making it an ideal choice for organizations seeking a privacy-friendly and customizable IAM solution.
GLUU's oxAuth is an open-source, self-sovereign identity management solution that empowers users to securely authenticate, provision, and govern access to resources across disparate systems and applications. As a privacy-friendly alternative to OneLogin, oxAuth offers unparalleled control, flexibility, and data ownership, shielding users from the risks of centralized authentication authorities.
LemonLDAP‑NG is a lightweight, modular web‑single sign‑on framework that authenticates users via SAML, OAuth2, and LDAP, providing centralized access control for web applications. Its fully open‑source, privacy‑oriented architecture makes it an ideal, compliant alternative to proprietary solutions like OneLogin, empowering organizations to maintain full data ownership while delivering seamless, secure authentication.
Frequently Asked Questions
What is the best open source alternative to OneLogin?
Based on GitHub community data (including star count and fork activity), Keycloak stands out as one of the most reliable open-source replacements for OneLogin today.
Why should I use an open-source replacement instead of OneLogin?
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.