I once saw Apple persistently using their product Keynote to do amazing prototyping in a common sense way. It is simple, but maybe simple is not what people want these days.

I have similar experience building an Survey Editor for my company. You sure need to look at the JavaScript ecosystem like NPM, React.js, Electron. You also need solid data structure and UI architecture like undo-redo command actions, etc.

Atomic.io is using React.js to do their thing. They seems to get their playback structure right.

Data structure you can look at immutable.js, Om of Clojurescript.

Look at how Circle CI's Local State, Global Concern demo.

It is very workable, pick a small layout to build, like drag and drop some UI or picture into the <Canvas> and soon you will have a much better idea.

I thought LinkedIn no longer allow company to use their API for such purpose as in import their CV profile. But nice React application and simple app.

I am looking forward to this. Having used Mou and Lightpaper, I find the preview scroll updating not able to keep up.

I supposed Typed will have custom theme also.

Sidebar folder panel is also a must just like Lightpaper as I write a lot of documentation and need to jump around the .md files alot.

Eager to see what this new MD editor will do :)