Ethan,
StackMob has a free package you can try. You can use JS SDK to write your HTML5 app and save stuff to the StackMob server. Meanwhile, you can write backend server-side logic by uploading custom code snippets (java/scala/clojure) to StackMob. It's designed so that this code becomes a REST API automatically so that you can hit it from anywhere to execute the logic server side and get JSON in return. You can host your HTML5 on StackMob for free and point your own domain to it as well.
- JS SDK
- JS SDK Tutorial
- Server Side Custom Code
- Hosting your HTML5
- Custom Domains
Erick - StackMob Engineer
