Note-in is a mobile app that aims to improve the presentation experience for both speakers and audiences. It allows speakers to upload their slides and audiences to view them on their mobile devices during the presentation. This allows audiences to interact by asking questions, providing feedback, and engaging more with the content. Note-in was developed by a team of 5 professionals over a 54-hour Startup Weekend event, where it won an award. They have outlined milestones over 6 months to further develop the app's features like chat, social integration, and archiving slides. The document shares feedback from potential users who feel Note-in could make presentations more interactive and improve engagement.