Nowadays we can see the evolution of science and technology worldwide. However, teachers and students in many developing countries are not fully aware of it. Also, they should know how to use this technology in the learning and teaching process. So in this poster I want to share my practices with all of them. I have done some low-cost experiments with mobile applications and used them in teaching and learning astronomy. We basically call it "AppStronomy". They proved to be effective during the COVID-19 pandemic, when students were away from their school laboratories and were missing their regular experimentation. We found these applications to be useful for students as well as for teachers to engage them in quality experimentation at home. Using these low-cost experiments they can better understand basic concepts in astronomy. These experiments are cost-effective and easy to make. We did several experiments using these applications and got good observations.