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Best Duende IdentityServer Alternatives ranked by AI · updated Aug 2026
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Duende IdentityServer is an OpenID Connect and OAuth 2.0 framework for building centralized identity and access-control services on .NET. It targets organizations that need a customizable identity server for applications, APIs, and single sign-on.
Developer: Duende Software
Price: Free Community Edition; commercial licensing varies
🎯 duendesoftware.com/products/identityserver
Top 6 Duende IdentityServer alternatives
DotNetOpenAuth was an open-source .NET library for implementing OAuth, OpenID, and related authentication protocols. It primarily served ASP.NET developers, but the project...
Pros
- Provided reusable OAuth and OpenID protocol implementations for .NET
- Supported both client and server integration scenarios
- Was available under an open-source license
Cons
- No longer actively maintained
- Targets obsolete OpenID and older OAuth-era integrations
- Lacks modern ASP.NET Core and OpenID Connect support
3
Auth0 provides a comprehensive platform for authentication and authorization.
Pros
- Customizable authentication flows
- Scalability
- Advanced security features
Cons
- Complex setup for some use cases
- Higher learning curve
Free tier available. Paid plans start at $23/month.
4
Microsoft Identity Web
Microsoft
Microsoft Identity Web is a library for integrating ASP.NET Core applications with Microsoft Entra ID and Microsoft identity platform services. It is...
Pros
- Maintained by Microsoft for modern ASP.NET Core applications
- Strong support for OpenID Connect, OAuth 2.0, and Microsoft Graph
- Better fit for Entra ID than legacy DotNetOpenAuth integrations
Cons
- Focused primarily on Microsoft identity services
- Less suitable for completely provider-neutral authentication
- Requires understanding of Entra ID configuration and tenant concepts
5
OpenIddict
Kévin Chalet and contributors
OpenIddict is an open-source framework for implementing OAuth 2.0 and OpenID Connect servers and validation in .NET applications. It is aimed at...
Pros
- Modern, actively maintained replacement for legacy .NET protocol libraries
- Supports OAuth 2.0 and OpenID Connect server, client, and validation scenarios
- Works with ASP.NET Core and common Entity Framework Core data stores
Cons
- Requires more identity-server expertise than managed services
- Configuration is more involved than using a hosted provider
- Operational security and availability remain the application's responsibility
6
ASP.NET Core Identity
Microsoft
ASP.NET Core Identity is Microsoft's membership system for managing users, passwords, roles, claims, and account security in ASP.NET Core applications. It suits...
Pros
- Included in the ASP.NET Core ecosystem with extensive Microsoft documentation
- Provides built-in user, role, password, and account-management features
- Integrates directly with Entity Framework Core and ASP.NET Core middleware
Cons
- Not a complete identity provider by itself
- OAuth and OpenID Connect server features require additional components
- Less suitable for multi-application single sign-on without extra architecture
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