Twitch plays Codebuff – a natural language coding experiment
Hi HN! We launched Codebuff last week, and it gave us a fun idea to try: Twitch plays Codebuff. We rigged up Twitch chat to control an old laptop of ours by sending Codebuff commands. Any chat message prefixed with ‘>’ is interpreted as a command for Codebuff. We’re starting with a blank web app running on localhost. So if you say “> Make the header spin”, then Codebuff will modify the css to make it happen. Codebuff can also run any terminal command (I hope you don’t brick our laptop haha). Yesterday we tested this out with our community and they successfully got Codebuff to add a map of…
In plain words
Twitch Plays Codebuff is a natural language coding experiment that lets Twitch chat viewers collectively control a web application by sending text commands prefixed with '>'. Codebuff interprets these commands to modify code, CSS, and run terminal commands on a localhost web app. For developers and streamers, it demonstrates collaborative programming in real-time, allowing audiences to build features together such as maps, visualizations, and tools through conversational prompts rather than traditional coding.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN! We launched Codebuff last week, and it gave us a fun idea to try: Twitch plays Codebuff. We rigged up Twitch chat to control an old laptop of ours by sending Codebuff commands. Any chat message prefixed with ‘>’ is interpreted as a command for Codebuff. We’re starting with a blank web app running on localhost. So if you say “> Make the header spin”, then Codebuff will modify the css to make it happen. Codebuff can also run any terminal command (I hope you don’t brick our laptop haha). Yesterday we tested this out with our community and they successfully got Codebuff to add a map of the US (via installing some package that it found), add all the state capitals as red dots, and draw the shortest path through the capitals. They also built a little synthesizer together. Maybe this could create a new category of open source, where a bunch of people synchronously create whole apps together by guiding an AI with natural language input? It’s exciting to combine the creativity of a crowd of humans with the raw ability of a coding agent. It’s also just fun to create with strangers and take an app in wildly different directions! We’ll be here for a couple hours, feel free to pop on by and add some fun stuff to our website! Or maybe troll everyone, iono.
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I wasn't quite sure if this qualified as "Show HN" given you can't really download it and try it out. However, dang said[0]: > If it's hardware or something that's not so easy to try out over the internet, find a different way to show how it actually works—a video, for example, or a detailed post with photos. Hopefully I did that? Additionally, I've put code and a detailed guide for the netboot computer management setup on GitHub: https://github.com/kentonv/lanparty Anyway, if this shouldn't have been Show HN, I apologize! [0]…
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