Every app you use on your iPhone or iPad sports a base file size, but you may notice that their storage footprint increases with time as you use them; this is because they build a cache file, an accumulation of data that gets used by the app to help it load more quickly.
If you find it challenging to live within your handset’s soldered storage constraints, then clearing your apps’ caches could help you cope. Fortunately, a free jailbreak tweak called CacheClearer (iOS 11) by iOS developers Julio Verne and Ryan Petrich lets you clear those caches on demand.