Youtube Sentiment Analysis

Youtube Sentiment Analysis is a lightweight Chrome extension that answers a simple question: what does this comment section actually feel like? Instead of skimming thousands of replies to guess the crowd's mood, it pulls the comments from the video you are watching, scores each one with the VADER (Valence Aware Dictionary and sEntiment Reasoner) model, and renders the outcome as charts layered on top of YouTube itself.

The project started inside a KU Leuven university course, and parts of its design are still tied to ongoing visualization research — the developers openly ask users to watch three videos and fill in a short questionnaire so they can study which chart styles help people understand sentiment best. In practice that means you get a research-grade sentiment panel for free, with the trade-off that it is a small student-built tool rather than a polished commercial product.

Because the analysis runs in the browser through the extension, there is no account to create, no subscription, and no dashboard to log into. It is aimed at viewers, creators and community managers who want a fast emotional read on a video's audience before deciding whether to engage, moderate, or study the reaction.