We built an app called Harmony Visualizer that provides users with a visual platform in which they can see how different notes can be harmonized in different keys. Our app allows users to select the key they want to analyze, and then hover over each key on the keyboard to visualize the relevant harmonies. Clicking on a key produces the relevant pitch, and there's also a toggle hold feature that lets users hear both notes at the same time. We're proud of our achievement after winning the low-code track at Dubhacks 2020, and we plan to expand our app to all major and minor keys, as well as incorporate more features like informational elements about the harmonization logic. Our app was built using Bubble's no-code platform, which enabled us to implement our ideas effectively without worrying about programming features like syntax and repositories. We're grateful for the support of Bubble, a leader in the no-code movement that offers a powerful point-and-click web editor and cloud hosting platform.