RenderGPT is a free Chrome extension developed by Matthew Downey. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory. The main purpose of this extension is to render HTML/JavaScript/CSS from ChatGPT into iframes.

With RenderGPT, users can easily render HTML or PlantUML code blocks in a ChatGPT conversation. The extension adds a "render" button to these code blocks, allowing users to view the rendered HTML in an iframe. Furthermore, users can select other code blocks, such as JavaScript and CSS, from the conversation and include them in the rendering. This feature enables users to mix and match different sources within the rendered output.