HODL is a free Chrome browser extension developed by sp85, falling under the Browsers category with a focus on Add-ons & Tools. The extension's tagline, "Sell isn't in your vocabulary. Hold the line," sets the tone for its unique functionality.

This extension replaces all occurrences of the word "sell" with the emoji sequence across web pages, reflecting the concept of diamond hands in the investing world. Additionally, it offers specific features tailored for certain websites; for instance, on robinhood.com, the "SELL" tab is removed, emphasizing the commitment to holding stocks. Users can also contribute by suggesting functionalities for other websites on the project's GitHub page.