In the application, Masked Visual Analysis (MVA) is introduced and can be used to generate real-time graphs for interrupted time series analysis. MVA has been recommended and warrants expanded attention as it is a method that increases the rigor of interrupted time-series while preserving the benefits of a response-guided approach, visual analysis, and randomization. Using the app, a valid evidence-based decision can be made regarding the effectiveness of treatment. The MVA app assists researcher in designing interrupted time series, data gathering, conducting a masked visual analysis and sharing data with other research teams.