Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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I have a question about Kratos.

Can a single Kratos server be used for multiple domains and for apps? E.g. <http://admin.foo.com|admin.foo.com>, <http://foo.com|foo.com> and MyFooApp? I wish for each domain and app to have their own login UI that communicates with the Kratos server, where one login can be used for all domains and apps. It is okay if the user should login multiple times.
I am unsure if this setup requires Hydra :slightly_smiling_face:

You can deploy a Kratos instance for each domain and point them all to the same database.
If you are looking for something like SSO you would use Ory Hydra as well. :slightly_smiling_face: