CommentPress is a small but powerful plugin for wordpress that allows you to insert, edit and delete comments fast and easy. CommentPress uses Ajax, jQuery and PHP to insert comments for what you don’t need to reload the page. This Plugin has many options to customize it and leave it to your liking, also includes a captcha to prevent comment spam and have more security in the forms.

Demo: https://codecanyon.net/item/commentpress-ajax-comments-insert-edit-and-delete-comments-for-wp/4542951