Sync.in is a web-based collaborative real-time editor, from Cynapse. It allows multiple people to edit the same text document simultaneously. Participants can see the changes in real-time, with each author's text in their own color. A chat box in the sidebar allows participants to communicate.Sync.in is based on EtherPad that was acquired by Google in December 2009 and released as open source later that month.Sync.in uses the Freemium financial model.