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Duende IdentityServer

Freemium

Enterprise‑grade OpenID Connect and OAuth 2.0 framework for .NET applications.

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4.6 Editor Rating
Vetted Score
4.6 / 5.0

Earns a high score for robust standards compliance, extensive extensibility, and strong .NET ecosystem support, though production use requires a paid license.

Key Features
Full OpenID Connect & OAuth 2.0 Support

Provides a standards‑compliant implementation for authentication, authorization, and federation across web, mobile, and API services.

Extensible Architecture

Custom grants, stores, and UI can be added via plug‑in points, enabling deep integration with existing identity stores.

Built‑in Security Features

Includes PKCE, token revocation, refresh token rotation, and advanced consent management out of the box.

Frequently Asked Questions

No, it is free only for development and testing; production deployments require a paid license.

It runs on any platform that supports .NET 6+, including Windows, Linux, and macOS.

Yes, the framework is highly extensible, allowing custom UI, grant types, and storage implementations.
Specifications
Pricing Model Free for development and testing; production licenses start at $2,500 per year (≈ $208.33/month) with volume discounts available.
Supported Platforms
WindowsLinuxmacOS