RBAC in Kubernetes is built from a Role (which grants permissions) and a RoleBinding (which attaches that Role to subjects). The Role and RoleBinding YAML Generator writes both documents in one file so you do not have to recall the rbac.authorization.k8s.io/v1 schema.
You set the Role name and namespace, then list one or more rules. Each rule names the apiGroups, resources and verbs it allows - entered one rule per line as apiGroups|resources|verbs. You then set the RoleBinding name and subjects, one per line as kind|name|namespace, where kind is User, Group or ServiceAccount. The tool wires up the roleRef automatically. The resulting YAML is valid rbac.authorization.k8s.io/v1.
Names are validated as RFC 1123 labels, at least one rule and one subject are required, and each rule needs resources and verbs. Problems are reported in a clear panel. Everything runs locally and nothing is uploaded.