Originally Posted by paulsalter
If as default I leave the app on the main storage it is 18meg
If I move the app to the sd card, the size of the app is just over 4meg
why is there a difference in size of the app ?
When an app is "moved" to the SD card not all of it is moved, just most of it. The 4 meg is what is left in main memory. Your actual readings may also depend on what app you are using to get those measurements, since some are better at providing details than others. There are also data and cache storage requirements that are not part of the app size.