To autorun an app at startup, you can follow these steps: 1. On Windows: Open the "Task Manager" by pressing Ctrl+Shift+Esc, go to the "Startup" tab, and click "Open Task Manager." Right-click on the app you want to autorun and select "Enable." 2. On macOS: Go to "System Preferences," click on "Users & Groups," select your username, and go to the "Login Items" tab. Click the "+" button, locate the app you want to autorun, and add it to the list. 3. On Android: The process may vary depending on the device and Android version. In general, you can go to the "Settings" menu, search for "Autostart" or "Startup Apps," and enable the option for the desired app to autorun at startup. 4. On iOS: Unfortunately, iOS does not provide a built-in feature to autorun apps at startup. Apple restricts this functionality for security and performance reasons. Please note that autorunning apps at startup should be done judiciously to avoid excessive resource usage or potential security risks. Always consider the impact on device performance and privacy when enabling autorun for apps.