The basic idea is we wanted a hosted Postman which allows you to wire your endpoints together "lego-style" into workflows (step 1 is authenticate, step 2 is fetch a list of users, step 3 is update the first user in the list). You can then shoot someone a URL and they can hit the "play" button and the API calls execute before their eyes. Some other notable features we've added are team support, versioning, and dependency tracking.

The drawback of most hosted services like this is you can't see things on private networks, like localhost or a corporate intranet. We have an OS X native app to circumvent this and a Windows version is coming soon.

We'll try to answer any questions you might have, thanks for checking it out!