微信群发助手 -- By HKing is a free Chrome add-on developed by unclehking. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory. This program aims to provide users with the ability to automatically add a prefix to messages sent in WeChat group chats.

With this add-on, users can customize the prefix that will be added to their messages when sending them in WeChat group chats. The prefix can be chosen from options such as friend nicknames, WeChat nicknames, or even a custom prefix.

This handy tool simplifies the process of adding a prefix to messages, making it easier for users to organize and differentiate their messages within group chats. It is a useful addition for those who frequently use WeChat for group communication and want to enhance their messaging experience.