What are the differences between Contributors and Viewers?
Contributors can use the Mac app and share their designs on your team’s Cloud workspace. Viewers don’t have access to the Mac app, but can log in to your shared workspace in their web browser to view, inspect and comment on designs. You can add unlimited Viewers to your team for free and you’ll only ever be billed for the number of Contributors you have. You can also change any team member’s role at any time.