Kerika gives you flexibility: For each board that you create, you can decide who gets to view it and who gets to make changes.
Set the privacy to Only people on the team, and this will limit access to the board to only those people who are added to the board team – no one else will be able to even find this board.
If you want to share the board with specific people, add them one by one to the board team, by clicking on the Board Team button on the top-right area of Kerika.
When a board is made Public, all the documents contained within it – on all the cards and canvases that make up that board – are also made viewable to the public.
Note: users of premium Google Apps, e.g. Google Apps for Business, cannot make their boards open to the public, because of limitations imposed by Google.