❓Can I use it with Vue or Angular

Short answer: Not exactly—it depends on how determined you are. Successful implementations in Angular and Vue have already been achieved, but these are not straightforward endeavors.

As of today, Keycloakify is primarily a React framework.

While Keycloakify as a build tool is agnostic to the frontend framework, it also includes a library of React components that are direct translations of the default theme. Reimplementing these components from scratch is not an easy task. Angular:

GitHub - kathari00/keycloakify-starter-angularGitHub

Vue:

Keycloak Theming Capabilities Using Modern Front End Frameworks · keycloak keycloak · Discussion #9093GitHub