Rapsai: Accelerating Machine Learning Prototyping of Multimedia Applications through Visual Programming is a visual programming platform that enables rapid and iterative development of end-to-end ML-based multimedia applications. It provides a no-code graphing experience using the node graph editor, allowing users to create and connect different components (nodes) to quickly build ML pipelines and see results in real time without writing code. Visual Blocks for ML also enables a better model evaluation experience through interactive characterization and visualization of ML model performance, as well as interactive data augmentation and comparison.