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Hi @User Kratos supports hooking up OIDC providers (including Hydra). However, with Hydra you would need to implement some code to make it work. But for general, sign in with google, facebook etc. it is supported out of the box.

Hi @User Thank you for the quick feedback. I think I asked my question wrong, so I draw a quick diagram to express myself better.

https://www.ory.sh/docs/kratos/guides/sign-in-with-github-google-facebook-linkedin Maybe check out these docs

I have an app, which can authenticate against OIDC. How can I connect this app to Kratos, while using the UI which is already in the app?

Yes you can become an OIDC provider through Hydra. As Hydra does not have it's own user management, any identity provider (including Kratos) can be used. This integration is however not available out of the box (yet). You have to build it, which definitely is possible. There is some more context in this issue: https://github.com/ory/kratos/issues/273 Specifically this branch, which however is a bit outdated: https://github.com/ory/kratos-selfservice-ui-node/tree/hydra-integration/contrib/hydra

Thanks for your reply. Also this is interesting: https://github.com/ory/hydra/discussions/2873