Close all running iPhone apps at once isn’t something Apple included in their iOS.
But there are workarounds.
Let’s first talk about the necessary information.
How do you know which iOS apps are running in the background? Well, there is a feature called App Switcher, and it provides a list of applications you’ve launched.
To open App Switcher, all you have to do is double press on the Home button.
This function has not changed since iOS 5. However, Apple did make some changes throughout their iOS releases.
Take a look below.
And then Apple start redesigning it with one of the major firmware: iOS 7.
And it remain unchanged for the most part. (as of writing this post)
Why Most People Use the App Switcher?
Most iPhone and iPad users, including myself, believe that closing unused apps will save battery.
Unfortunately, that’s not the case.
According to Apple and various research on the internet, closing background applications in iOS doesn’t help to preserve battery life at all.
Some people also use the App Switcher to switch between apps faster and kill an app that stopped working.
Using the traditional method
Although you can’t close all running apps at once, you can still close them individually.
Start off by accessing the App Switcher, then tap on the X button on top of each icon (if you use iOS 6 or lower). For iOs 9 and above, you can use multiple fingers and swipe up.
If you have a jailbroken iPhone, you’re in for a treat. There is a jailbreak tweak called SmartClose by developer Ryan Petrich. It will lets you close all iPhone apps at once.
Step 1: Open Cydia
Step 2: Go to Sources tab and add the following repository: http://rpetri.ch/repos/
Step 3: There are a bunch of free tweaks in there, but for now, just look for SmartClose tweak and install it
Once the tweak the installed, it will create an options panel in your Settings app. You will need to go there to assign a gesture for SmartClose so that you can close every running apps in less than 3 seconds.
Although SmartClose is a good jailbreak app, there are many alternatives to it such as ClassicSwitcher or SwitchSpring.
It’s up to you to decide which one you want to use. Again, we highly encourage you to only use this feature when necessary not for saving battery because it won’t help.