privacyIDEA is a versatile, open-source multi-factor authentication solution that provides secure access to IT resources.
Free and Enterprise versions available
Best Duo Alternatives ranked by AI · updated Aug 2026
Duo is a cloud MFA and access security platform for organizations protecting workforce applications, devices, and remote access. It stands out for broad integrations, easy deployment, and support for adaptive risk-based authentication.
Top 6 Duo alternatives
Keycloak is an open-source Identity and Access Management solution aimed at modern applications and services.
Free and open-source
3
AuthLite
Gemini Security Solutions, LLC
AuthLite is an on-premises multifactor authentication platform for Microsoft Active Directory environments. It adds smart-card or token-based authentication to Windows logons, Remote...
Pros
- Designed specifically for on-premises Active Directory environments
- Supports offline and disconnected Windows authentication scenarios
- Avoids requiring a cloud identity provider for core authentication
Cons
- Less suitable than cloud MFA platforms for SaaS-first organizations
- Narrower integration ecosystem than Duo or Okta
- Requires Windows and Active Directory expertise to deploy
Okta Workforce Identity is a cloud identity platform for employee single sign-on, MFA, lifecycle management, and adaptive access. It serves organizations with...
Pros
- Broader SaaS single sign-on coverage than AuthLite
- Strong lifecycle management and delegated administration
- Adaptive MFA supports device, network, and risk signals
Cons
- Higher cost than basic on-premises MFA deployments
- Requires more configuration and identity architecture planning
- Cloud-first design is less suitable for disconnected environments
From $6/user/month
MFAuth is a self-hosted multi-factor authentication server for organizations that want to manage authentication without relying on a hosted identity provider. It...
Pros
- Self-hosted deployment keeps authentication data under your control
- Lower operating cost than commercial MFA platforms
- Suitable for organizations that need an independently managed MFA service
Cons
- Requires more administration than hosted services such as Duo
- Smaller ecosystem and integration library than Keycloak or Auth0
- Documentation and enterprise support are less mature than commercial alternatives
Free, open source
Authelia is an open-source authentication and authorization server for adding single sign-on and multi-factor authentication to applications behind reverse proxies. It is...
Pros
- Strong reverse-proxy integration for self-hosted services
- Includes two-factor authentication and granular access policies
- Lightweight compared with full identity platforms
Cons
- Requires self-hosting and operational maintenance
- Fewer enterprise directory and lifecycle features than Keycloak or Okta
- Less suitable for large multi-tenant identity deployments
Free, open source
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