What's True Online is a free Chrome plugin developed by Brass Nine Design. It falls under the category of Browsers and specifically belongs to the Add-ons & Tools subcategory.

This plugin aims to help users determine the accuracy of the information they come across on the internet. It works by checking stories in your Facebook feed and injecting labels to indicate their veracity. Stories that have been fact-checked and found to be true are marked with [True], while sites that demonstrate a clear commitment to the truth are labeled as [Likely True]. On the other hand, sites that are known to spread misinformation are marked as [Likely False].