We propose Memo:me, an AR sticky note with priority-based color transition and on-time reminders in smartphones. For the priority-based color transition, the user can choose by himself among three different colors, or the system changes the color automatically 10 minutes before the entered time. For the on-time reminder, Memo:me provides a visual notification and a sound at the designated time. We enabled users to create virtual notes on planes, or carry daily objects with the virtual notes attached. We expect that our system would benefit users to manage their tasks in a time-appropriate manner.