The size of the Ionic app can be reduced in the following ways :
* First, compress all the screenshots and icons and deletes all unwanted icons. If you use portrait mode, keep only portrait screenshots, and if you are using landscape mode, keep all the screenshots landscape.
* Second, minify all JS and CSS files and update the index.html file accordingly.
* Third, remove unwanted external modules and Cordova plugins that are not being used. You can also remove unnecessary code from the app, which adds a lot of extra bytes to the app's size.
* Last, you can also run the following command to reduce the app size: ionic build android -prod.
