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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Hey. You can do it without any additional backend services. The hosted UI solves two problems:
1. To demonstrate an example of building app using Kratos
2. To implement UI for Ory Kratos
However, you can skip this part and you can use Angular app and proxying requests to Ory Kratos.