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how do you clear app cache on an iphone to get storage back?

My iPhone 13 says storage is almost full and the Other/System Data bit is huge. Android has a clear cache button per app but I can't find anything like that on iOS. Is offloading the only way?
clear cache iphone
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alex_7 Oct 29, 2026
sophia_gadget
There's no clear cache button, no. A few apps have their own option in their settings (Spotify, TikTok, browsers), but for most the only way is to delete the app and reinstall it. Offload doesn't help here, it removes the app and keeps its data, and the data is the big part. System Data mostly isn't app cache anyway. It often shrinks a lot after a restart, and more after a day or two on the charger. Settings > General > iPhone Storage, tap an app and it shows Documents & Data separately, so you can see which ones are actually worth reinstalling.
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