I constantly find myself cleaning out the app switcher on my iPad mini, either because I need to free up RAM, because I need to fully restart an app, or because I just want to keep it clean. On stock iOS, that task involves holding down the icons until they start shaking, and then tapping away at those red close buttons, one by one. It’s rather backwards that there’s no way to just kill all, but luckily, there’s a jailbreak tweak to fix that.
KillBackground is a free tweak in Cydia, and what it does is simply allow you to add a “kill all”-button to the app switcher. You have several options regarding where it’s placed, how it looks, whether it should kill music, whether to avoid killing certain apps, and whether the button should be visible without first getting the icons to shake. I keep it set to always show a red button on the left side of the switcher, and clicking that button simply kills all the apps at once.
It’s a simple tweak, but one that saves you a lot of tapping in the long run. Very often jailbreak tweaks do just that: fix weird little annoyances in iOS, without making a big fuzz about it.