This research aims to develop a virtual lab application with oscillation concept. Oscillation concept in this application is described as pendulum motion. The application was developed by using the ADDIE model and Easy Java Simulations (EJSs) software. https://www.lightemupsequences.com/amazing-find-Gold-Silver-Pom-Pom-Cupcake-Toppers-8-Pkt-big-deal