CreatorML is a machine learning tool that helps YouTube channels optimize their thumbnails and titles to maximize their Click-Through Rate (CTR). It uses computer vision and natural language processing to generate CTR estimates that are accurate within half a standard deviation of the true click-through rate. Through the use of Attention Heatmaps, users can identify elements in their thumbnails that draw viewer attention and lead to an increase in the Estimated CTR. Additionally, users can also view how CTR changes with duration and views. CreatorML also offers Custom CTR Predictors, which are fine-tuned to specific channels and offer up to 60% more accurate estimates. CreatorML is free for a limited usage, with paid plans available for additional features.