I'd say the pricing is about the same. You do, however, get access to a hosted environment with all of Hydna's plans (including the free one). You can use this environment to deploy rules and custom logic, reducing the need to set up a third party server.

Most applications during the beta so far have consisted of static files deployed to a CDN, running server-side logic in aforementioned environments. We'll be working a lot towards this workflow in hopes to make it as simple as possible for you guys to build and scale real-time-enabled applications.