HNGist is a Chrome add-on developed by blogsooner. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools program. The main purpose of HNGist is to provide a summary sentence for every level of a comment thread on Hacker News. This functionality is inspired by the Hacker News Collapse extension created by tomi.czinege.

With HNGist, users can quickly skim through comment threads on Hacker News and get a summary sentence for each level of the thread. This feature helps users save time and decide whether they want to read the entire thread or not. By collapsing the comment thread into summary sentences, HNGist enables users to easily navigate and explore the discussions on Hacker News.

HNGist is available for free on the Chrome platform, making it accessible to a wide range of users. It offers a convenient way to enhance the browsing experience on Hacker News by providing concise summaries of comment threads.