Sets is a community management tool designed to bring users together with a simple user interface, allowing them to discuss, create events, and share profiles. The app has two types of users - community organizers and members - who have different levels of access and functionality. Oli Littlejohn, the founder, chose Bubble as the no-code platform for its customization options, features, and integrations, which allowed him to build a web app despite having a non-technical background. Sets has received positive feedback from users and has even generated revenue through paid subscriptions. The future plans for the app include continued user experience improvements without adding unnecessary features.