In the last two days, updates to the official Twitter and Dropbox apps for iOS have added an option to clear the contents of their caches.
Cache management has always been an issue on iOS: some apps can accumulate several hundred MBs of cached data and there isn’t an easy way to purge all these separate app caches, which is why companies are implementing their own custom solutions. Currently, Facebook has a cache of 534 MB on my iPhone; Twitter and Instagram have 365 MB; Super Mario Run, GIPHY, and Google Maps have 340 MB stored in cache.
These numbers add up, particularly if you don’t buy Apple’s highest-capacity iPhone models. I appreciate that developers are fixing this problem themselves, but Apple should add a native option in the iOS Settings app to clear app caches more easily.