Picoprep is a low-volume bowel preparation used to optimize visualization of the colonic mucosa during colonoscopy. Patients referred for a colonoscopy will be scheduled for an intake. During this intake patients receive education about Picoprep and will be asked about their health condition (medical history, medication use). Standard a face-to-face education is given by an intake nurse or doctor. The producers of Picoprep, Ferring BV designed an app including a drinking schedule adapted to the timing of the coloscopy, aiming a lag time between intake of the last Picoprep dose and the scopy of 2-4 hours. We hypothesize that the Boston Bowel Preparation Scale and patient satisfaction will be higher in patients receiving standard education plus using the bowel preparation app versus patients receiving single standard education.