CloudApp is not a HIPPA compliant system.
The ability to easily share content links and our internal way to check accounts on our side makes us fall outside of compliance. We aren't working on becoming compliant as of right now because it would make the app lose a lot of functionality and not be able to use all the great features available to you.
Outside of this, our app does have great restrictions built within it to only allow certain users to see an item and a few other great restriction options as well. You can see them here: https://support.getcloudapp.com/article/257-who-can-access-my-drops