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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Is Ory cloud only useful to companies that run all their separate apps on subdomains of the same root domain?

no, you can set up an oauth flow to work with an app on another domain. All the oauth clients have to be registered in hydra, then identities are granted access in keto. on login the flow retrieves the access grant from keto and your client app responds accordingly.

kratos is the identity store. all the individual user records. keto is where you give them permissions. hydra handles the handshakes for clients.

Do you have any insight into why I'm being told that this is preventing us from implementing Ory? <https://github.com/ory/kratos/issues/662>

see <https://github.com/ory/kratos/issues/662#issuecomment-1304064542|https://github.com/ory/kratos/issues/662#issuecomment-1304064542>