Figure 2.

PEPPER graphical user interface corresponding to the smartphone version. Blue square displays an estimate of the active insulin bolus; yellow circle shows an estimate of the remaining carbohydrates on-board; pink circle displays the blood glucose level coming from the CGM. The upper graph shows the CGM measurements in dotted (pink line) and the 30-minute forecasted glucose values (dotted green line); the remaining graphs display the injected insulin boluses, the ingested carbohydrates, and the step counts, respectively. The “Get bolus advice” button triggers an insulin dose recommendation that is displayed to the user.