Voting:You can choose between classic and emotion voting to allow your users to vote. Classic voting will come up with a simple Like or Dislike symbol. Emotion voting allows you give different emotion smileys as shown below. By this, you can understand the feedback from your users.
They can also add a comment to your article to let you know what they think about the article. You can find all these at Dashboard -> Helpdesk -> Helpie settings -> Single Page. Helpie also has Insights through which you can get insights into your Knowledge Base, your users, articles and get simple actionable feedback. You can find Insights in Helpdesk Dashboard.
Most Happy/Unhappy Users:
Helpie’s Insights show you the most happy and most unhappy users based on their feedback on your articles.
Based on the same user feedback, Insights show you the best and worst performing articles on your Knowledgebase wiki.