IdentityServer

The most flexible and standards-compliant OpenID Connect and OAuth framework for ASP.NET Core.

When off-the-shelf products are just not flexible enough

IdentityServer gives you full control over your UI, UX, business logic, and data.

In IdentityServer, customizing your workflows is not an afterthought. Our APIs and extensibility points allow adapting to your workflows and business rules without having to find complicated workarounds.

You can choose whichever UI framework or technology suits you best to integrate with our token engine.

We believe that C# is the best DSL — don't bother with trying to express your logic in YAML, XML, or other "languages".

In short, if what you want to achieve is doable in .NET Core, it is doable with IdentityServer.

There's a reason why protocols exist: they ensure interoperability, a common language, and proven security practices.

Being fully standards compliant is very important to us, and we want to give you access to every aspect of the OAuth and OpenID Connect protocol family.

IdentityServer is officially certified by the OpenID Foundation, and our ongoing mission is to implement every published specification from the IETF working group.

We are true to standards

Unlimited hosting options

You are not forced onto a specific hosting environment or other peoples' servers — you are not forced to use a specific database or geographical region.

You can run IdentityServer wherever you need: on premises, cloud, behind a VPN, Windows, Linux, Docker, Kubernetes — you name it. Even in a suitcase.

Putting your requirements in the center is our motivation.

All of our source code is on GitHub. This is great for learning or troubleshooting, and makes understanding the inner workings much easier. Also, our development process is fully transparent using industry best practices like public issue trackers and pull requests.

Development in the open

Standard License Pricing

Free for development, testing and personal projects—only pay for production. Try it now!

Learn more about our free Community Edition.

Starter Edition

Up to 2 Client IDs
Unlimited Users
Unlimited APIs
Single Production Deployment
Security Notification Service
Standard Developer Support
Access to Source Code

1,500

USD /year

Business Edition

Up to 10 Client IDs
Unlimited Users
Unlimited APIs
Single Production Deployment
All Starter Edition Features
Automatic Key Management
Server-Side Sessions
Standard Developer Support

9,000

USD /year

Frequently Asked Questions

How do I know which license I require?

Review our licensing packages on the Duende IdentityServer, Duende IdentityServer for Redistribution, and BFF product pages. We offer a variety of licensing options designed for your architectural and business requirement needs. Not sure which license is right for you, or require a custom package? Reach out to our sales team to learn more.

What is a Client ID?

A client is a piece of software that requests tokens from your IdentityServer - either for authenticating a user (requesting an identity token) or for accessing a resource (requesting an access token). A client must be first registered with your IdentityServer before it can request tokens.

While there are many different client types, e.g. web applications, native mobile or desktop applications, SPAs, server processes etc., they can all be put into two high-level categories: Machine to Machine Communication and Interactive Applications.

Do you offer trial or development licenses?

Duende IdentityServer is free for development, testing and personal projects, but production use requires a license.

Do I need a license for development/non-production use?

You do not need a license for development, testing, or trial. Download and use our library from NuGet and get started with trial mode. Start learning with the Duende IdentityServer quickstart tutorials.

What if I want to upgrade my license in the future?

You can upgrade the license at any point in time. We will issue you a new license for a new term and provide credit for the remaining time on any existing licenses on a prorated basis.