BRANCHING AND MERGING IN A DESIGN INTERFACE

A network computer provides interactive graphic design system instructions for execution at a user computing device. The user computing device receives main workspace data describing a main design interface, renders the main design interface, and provides an input interface for the user. The user computing device interprets a branch input action by the user to create a branch from the main design interface, obtains branch workspace data for a branch design interface generated based on the main workspace data, interprets one or more change input actions to the branch design interface, and updates the branch workspace data. The user computing device obtains a set of differences between the branch design interface and the main design interface identified based on the main workspace data and the branch workspace data, and renders a review interface. The review interface includes a visual representation of at least one difference.