This is a collaborative text synchronized as you type. This means that others with whom you are sharing the page can see what you are writing as you write it.
Sync.in is a web based word processor for people to collaborate in real-time.
When multiple people edit the same document simultaneously, any changes are instantly reflected on everyone's screen. The result is a new and productive way to collaborate with text documents, useful for meeting notes, brainstorming, project planning, training, and more.