this is one of first dev tools we are planning to bring to React + Mantra. This is a way to develop, design and visually test your React UI components without an app.
This is how it looks like:
If you are familiar with UI Harness for Meteor, this is similar tool but more complete and works with any React app.
I think our version is more Meteor-specific, so there should be some differentiation there. But I haven’t looked at the code yet, I’ll check it out once it’s open!