It would be really good if one could choose if the comments should we visible for other users or not.
Sometimes there is value in the users not seeing each others comments and sometimes there is good to be able to 'discuss' the mockups.
I agree! Please create this feature. I would like to be able to keep clients from seeing internal comments.
David Knell commented
I would REEEEEEALLY like the ability to have all comments in a prototype private. Sometimes, you want everyone to discuss a prototype together, to build on each other's observations. But most of the time, you want people to share their feedback independent of each other, to be blind to other people's opinions so their feedback is pure and unbiased. Therefore, it would be immensely valuable to mark a prototype such that commenters can't see each other's comments, but only the designer can see them all.
Hannah Milan commented
voted for this one. I think it would be helpful too if a user can select one or multiple people reply and post a comment too.