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.