"No harm done" is an expression we often use to indicate that no harm or damage has been caused by a particular action. It's a phrase that is often used to calm down someone who is worried or upset over something they did. However, there are many other phrases that can replace "no harm done." These include "all is well," "no worries," "nothing to worry about," "nothing to be concerned about," "it's all good," "no damage done," or "no harm, no foul." Each of these phrases have slightly different nuances, but they all work to convey the same message that a situation is under control and no harm has been done.