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 suppose it depends. are you developing apis that the users will use 1st-party? or are these apis that the users will give access to other applications to use on their behalf under specific restrictions or scopes?

my frontend will communicate with the api's.
not the user specifically

so, ya only my own apps will communicate with these.
But i do need Keto so i know if t he users has permissions to my stuff i'm making

then yeah - hydra for oauth2 integration. kratos for user management/identity. your applications would be registered with hydra. you'd configure your users in kratos. also would configure kratos with hydra so your application could initiate consent from the users to your application concerning the api.

not extremely hard but more complicated than some.

I figured it might be complicated. :) probably more than this app needs.
But I hate seeing all the security issues out there.. So why not just build it right from the start with a nice tool