[_mql]

I think the approaches of Substance and ProseMirror are quite similar. We map DOM coordinates to model coordinates and the other way around. That way we can use the native DOM for cursor navigation (not trivial to implement), but all input is applied on the model first and then updated in the view component.

I had a brief talk with the author of ProseMirror the other day. From my point of view the difference lies in scope. ProseMirror's focus is providing an editor widget that can be extended but works out of the box with HTML + markdown. With Substance you basically start from zero, and you probably have to invest more time to get going. But then you could build apps that are not limited to one isolated editor area for instance. You could build a custom title editor, body editor and metadata editor and have a shared toolbar for them and shared undo/redo history. Substance also provides a bunch of top-level UI components that you can but don't have to use. A ScrollPane with a visual scrollbar for instance. A Table Of Contents component, TwoPanel editor layout etc.