This app is a visual conditional probability demonstration tool suitable for statistical teaching, learning, and intuitive understanding of probability. Users simply enter the probabilities of event A, event B, and their intersection (P(A), P(B), P(A∩B)). The system automatically calculates the conditional probabilities and displays the relationships between the regions in a four-panel table and Venn diagram. The charts are clear and intuitive, making them a great aid for teaching and research. PDF reports can be exported for easy archiving and sharing, and a history function is provided for reviewing and reusing entered data at any time.