The impact of the Covid-19 virus cases continues to increase and has an impact on many lives, including young children. Schools are closed, and students are studying from home. Using online platforms is an advantage because it helps the teaching and learning process. Even though it is online learning, students' work also needs to be evaluated. Similar research has occurred in vocational education but is considered boring and has not been standardized. This study combines gamified software as a practical application among lower primary students to provide interesting evaluations on STEM learning, which is considered helpful for evaluation for many schools. We built the software using a 6D framework with stages of development, starting from determining business goals and describing the target's behavior until deploying the software. The evaluation period was carried out for 14 days using 30 respondents by analyzing Pre-test Vs. Post-test and activity logs. The results showed significant improvements in science, technology, engineering, and mathematics individually, with an average of more than 20% and 13%, respectively. Finally, through this study, we confirm that carefully designed gamified software for lower primary school students has helped achieve non-gaming-related goals and improved evaluation techniques for online learning.