The C2Day App helps you stay on track before, during, and after treatment. Set up automatic reminders for your hep C and other medicines. Keep track of your daily activities. It's easy. Track the progress you've made at the end of each week. Connect with people just like you. Weekly challenges help you stay on track by creating healthy habits. Quick tips to help put you on the path to a healthier you. How to make smarter food choices. The C2Day App. It's designed to help support your treatment experience.