To judge the technical aspects of a team’s project, we recommend viewing the Demo Video. It is not required to view a team's source code; however, if you would like to view their code and run it yourself, you may do so. Each team uploads their project code, or a link to their project, depending on the platform they used for their project. For App Inventor, the team uploads a .aia project file that must be imported to MIT App Inventor in order to view and run. For Thunkable, the team provides a project link. Clicking on the link will open the project in Thunkable. Both require you to sign up to use the platform. If teams used other programming languages, they will have uploaded a zip file containing their source code.
For App Inventor and Thunkable, here are detailed instructions.
Note for Thunkable projects that use Firebase as their cloud storage: To protect the privacy of the author, Thunkable removes the API key. This means you as a judge will not be able to test the app. You will be able to view the code and will have to judge the project without actually running the app. The Demo Video will be your main source to judge the technical aspects of the project.