The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core (by DuendeSoftware)

IdentityServer Alternatives

Similar projects and alternatives to IdentityServer

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better IdentityServer alternative or higher similarity.

IdentityServer reviews and mentions

Posts with mentions or reviews of IdentityServer. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-10-25.
  • Identity server 4
    1 project | /r/dotnet | 11 Dec 2023
    Its deprecated in favor of Duende Identityserver which introduced a license model.
  • How does cookie based authentication work?
    1 project | /r/dotnetcore | 4 Nov 2022
    Tokens usually have a lifetime and they are separate from the user's authentication principals like username and password. Unless you are rolling your own form of token provider (not something that would be recommended) the token creation is handled for you. Take a look at or if your organization makes under 1M in income a year the free version of what Identity Server progressed into
  • Ask HN: Examples of Top C# Code?
    29 projects | | 25 Oct 2022
  • ImageSharp leaving the .NET Foundation due to licensing change
    8 projects | | 22 Oct 2022
    I think Duende (Identity Server) handled the situation pretty well.

    > Standard License Pricing

  • Seeking people for collaboration on open source projects I started. Also open to ideas. Preferably long-term. I can help you learn and you can help me with other things, such as coding, UI and more. Beginner friendly. Safe environment.
    2 projects | /r/ProgrammingBuddies | 16 Oct 2022
    Thanks for your message. No, the idea was not to re-implement OAuth nor OpenID stuff. What I had in mind for the authentication thingy was something like this: If we want to go the OAuth/OpenID way, in .NET we have this one:
  • If you were tasked with implementing Identity and Access Management today, what would you do?
    2 projects | /r/dotnet | 3 Oct 2022
  • Bytebase: 20-Person Startup, 30 SaaS Services, and $1,183 Monthly Bill
    5 projects | | 26 Sep 2022
    > As you said, there are plenty of local options that you only need to run.

    I think managed databases are a good analogy here. While I might run my own PostgreSQL/MariaDB instance, many out there won't be overjoyed at the idea of actually needing to run and manage the damned thing, as well as set up some kind of alerting and handling the need to eventually scale it up.

    > It also has the largest risk of compromise and data leaking from any service you may use...

    PII is definitely a big concern, even if something like password hashes aren't too useful on their own (provided that they're salted), though in cases like that it might actually make a lot of sense to utilize a widely used and tested solution that's specialized for this particular use case.

    In many cases, thousands of people across the globe will be able to develop something and squash any bugs in it better than you might be able to do individually or with your own team, though there might be a few exceptions out there. Auth is probably not one of the cases where you want to write code without a lot of eyes on it.

    > ...the largest amount of potential lock-in...

    This is debatable: standards like OAuth2 and OIDC technically make many of the solutions and libraries way more pluggable and make it easier to choose between various implementations, depending on your needs.

    Of course, something like Keycloak also has its own API (as do many of the cloud offerings) so if you build too much automation around a particular implementation, then that advantage partially goes out the window.

    > ...and the least need for integration.

    I'm not sure about this, it probably depends on your architecture. If you have a monolithic web app, then you probably don't need a separate turnkey/SaaS solution, whereas if you have an ever growing number of services, whilst you want to manage authentication and accounts against all of them centrally, then something like Keycloak (or one of the cloud alternatives) become way more lucrative.

    That said, I'd still opt for self-hostable options whenever possible, albeit I also don't trust cloud based password managers and such, preferring something like KeePass instead. I've probably just come to a different conclusion in regards to usability/responsibility/features/security than some other people.

    Sadly, there aren't that many good options out there at the moment, apart from Keycloak. For example, IdentityServer is promising, but went in a commercial direction:

  • Why is authentication such a sh*t show with .NET 6?
    3 projects | /r/dotnet | 11 Jun 2022
    He's referring to IdentityServer 3/4, which was open sourced, and was not owned by Microsoft. That 3rd party is commercializing their work (and to be fair, it's a lot of work) as , and has a different commercial licensing model.
  • Show HN: Open-Source Identity Server Written in Go (Ory Kratos)
    9 projects | | 9 Jun 2022 does not seem to square with any definition of "open source" I'm familiar with, and that goes double for having an in-repo file that just says "read this unversioned pdf on some other site"
  • Creating JWT token auth yourself - is it secure?
    2 projects | /r/csharp | 18 Jan 2022
    I would not recommend it. There is a server named Duende identity server which you can host locally.
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Basic IdentityServer repo stats
4 days ago

DuendeSoftware/IdentityServer is an open source project licensed under DUENDE™ SOFTWARE LICENSE AGREEMENT which is not an OSI approved license.

The primary programming language of IdentityServer is JavaScript.

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