When you tap on the home button twice on your iPhone, you will see a list of your recently used apps. Depending on the app, it could be running in the background or on standby mode.
You can manage the apps hidden in the dock by removing them manually. This sends the applications to a closed state. But is there an app killer for iPhone that allows you to close all background apps at once?

You can use an app killer to remove apps running in the background or on standby mode. An app killer will remove all the applications you are not using, and free some memory on your device.
Note that these apps will also stop streaming apps and files you are currently downloading in the background.
Whenever you close apps on iPhone, they save your information and go into standby mode in the dock. When you open the app again, it will load from where you left.
An app killer, on the other hand, will close the app completely. That means the application will load afresh when you re-open it.
Should I kill apps on iPhone?
Many people believe killing or quitting apps running in the background can help them save battery life even when they are not using the applications.
But that is not correct. Instead, killing all apps at once can reduce battery life.
You should only force stop an app on iPhone if it is unresponsive. When your recently used applications appear in the dock, they are not open. Instead, they are in standby mode.
Standby mode helps you to navigate between apps and multitask. Once you open the apps, they will begin from where you left off.
But if you close them down, they will have to load again. The whole process of loading takes too much memory and can drain the battery.
How do you kill an app on your iPhone?
You can kill an app on your iPhone without using an app killer using the steps below:
- If you are using iPhone X and newer, swipe up halfway on the screen and pause. You will see the multitasking view. Then, swipe the app up and off the top to close it.
- If you are using iPhone 8 and 7, double-tap the Home button. Then, slide the apps to find the one to kill. Swipe the app up and off the top to close it.
- For iOS 6 and below, double-tap the Home button. You will then have to slide all apps to locate the one to close. Tap and hold the app and then tap the red badge to kill it.
What are the best task killer apps for an iPhone?
If you are looking for the best task killer apps for your iPhone, here are four of them that are worth considering:
1. SnapStats

SnapStats is a device statistics and information app for iPhones. It tracks the statistics of your device and allows you to perform specific actions.
The app gives you access to your network data usage, battery life, GPU, and CPU status. You can use it to discontinue apps on iPhone, to ensure they do not run in the background.
SnapStats is available for free and designed for offline usage. It has useful features that show your device boot time, memory or RAM statistics, and system model.
You can also use it to have a quick overview of your storage. The app is available for iPhone 12 and iPad.
2. SYSMonitor

SYSMonitor is a widget that helps you to monitor your iPhone. It will stop an app from running in the background and help you to determine why your background processes are too much.
You can use the application to know which apps are consuming lots of data or why you have too much data traffic.
Also, you can get basic information about your device, including its name, model, iOS version, screen resolution, and more.
The application monitors many things on your iPhone. These include the CPU, memory or ram, and storage. SYSMonitor also helps you to identify real-time network speed.
It represents the data in a format you can understand. Furthermore, the app can detect device issues like dead or bright pixels, temperature, and light leakage.
3. SYS Activity Manager

SYS Activity Manager is one of the best applications that tell you the background processes and apps running on your device. You can use it to turn off apps running in the background on an iPhone.
The app can monitor the battery life on your phone, network activity, and network speed. You will also know whether you are connecting to the internet using LTE, 3G, or Wi-Fi networks.
The app killer for iPhone is also a helpful tool for diagnosing network problems by connection status. Furthermore, SYS Activity Manager gives you a summary of your disk usage.
It also helps you to understand the memory status of your device. The app has alarms that will ring to indicate your battery is 100% full or the current charging status.
4. System Status Lite

System Status Lite is an advanced app that lets you monitor the performance of your iPhone. It works by displaying the basic parameters of your phone.
That includes the apps you are currently using or in standby mode. The application then gives you the option to close them and improve device memory.
Furthermore, you can use System Status Lite to monitor the battery level, disk usage, CPU load, and network connections. It will display whether your battery is full, discharging, or charging.
You will also view the used and free disk capacity of your phone. The app ad updates the CPU usage in real-time and its average load over a specific period. The app is free to download.
Conclusion
You can use an app killer for iPhone to close all apps running in the background or standby mode. The best app killers for iPhones are SYS Activity Manager, System Status Lite, SnapStats, and SYS Monitor.
Alternatively, you can close all apps on your iPhone by swiping your screen halfway and identifying the applications you want to kill.
However, understand that closing apps at once may not be the best method for saving your device battery life.