What are the best task killer apps?

Being too busy, we may forget how to optimize our smartphone's performance. This list helps you explore the best task killer apps that would help close unimportant running programs on your phone as the fewer apps you have running, the better your phone's performance and battery life will be.

asked by Anonymous
376 contributors
8 solutions
  1. 122

    #1Advanced Task Manager

    Advanced Task Manager

    Advanced Task Manager is a multi-functional app that works as an app closer, battery saver and a speed booster. This is very helpful as it optimizes your phone's performance for better use. 




    Emily Dunn
    Written on June 18, 2019
    "I needed this task killer app badly since my phone always suffers from slowing down and fast battery draining because of apps that i'm always not being aware of. This is definitely one of the best app killers out there that's easy to have."
  2. 51

    #2Smart Task Manager

    Smart Task Manager

    Smart Task Manager works for the complete optimization and management of your device's system. It is a good app killer that also monitors your SD-Card and device performance,




    Cheng Gu
    Written on June 18, 2019
    "I don't want my phone lagging and slowing down especially when I'm about to watch movies in it. This app helped me improve my phone's performance in a huge way as it really monitors my device all the time. Great app manager and app killer"
  3. 41

    #3Watchdog Task Manager Lite

    Watchdog Task Manager Lite

    Watchdog Task Manager Lite is a good task killer app for Android users. By monitoring all the apps and alerts, it gets rid of unwanted background apps that slow down your device.




    Russell Ruiz
    Written on June 18, 2019
    "I sometimes forget to take care of my phone's battery because of unnecessary updates that i'm not aware of. that's why I had to download this task killer app to close unnecessary background apps"


The VisiCalc spreadsheet for the Apple II series is considered as the first recognized example of a killer application. In marketing terms, a killer app is a computer program that is needed to prove the core value of larger technologies like a computer hardware or software, programming language, gaming console, software platform, or an operating system. A killer app increases the sales of the platform where it runs in.

The definition of the term killer app once came up when Bill Gates was questioning the US vs Microsoft Corp. case. He wrote an email describing Internet Explorer as a killer app. At that time, he actually meant it as a popular application rather than an app that fuels sales of a larger product or one that would supplant its competition as per the definition of Microsoft’s Computer dictionary. The term was also used for the computer and video games industry. Examples of a video game killer app are 1980 Atari VCS port of the arcade game Space Invaders; 1979 Star Raiders as the killer app for the Atari 400/800 computers; Donkey Kong for the ColecoVision console; Tetris as the killer app for the Game Boy; Grand Theft Auto III for the PlayStation 2; Super Smash Bros. Melee for the Nintendo GameCube, and Wii Sports for the Wii.

  1. 39

    #4Clean Master

    Clean Master

    Clean Master is an app that works for Android devices by cleaning up junk files, boosting phone speed, and making sure your phone is in optimum status by killing background apps.


    Android, Windows


    Yang Lee
    Written on June 18, 2019
    "Having a lot of my files checked all the time is a big plus for me, plus this app is able to work as a task killer or task closer is a must for my phone :)"
  2. 35



    Greenify works as an app closer by identifying apps that need to hibernate whenever you are doing something with your device. In turn, it stops device lagging while also saving your battery.


    Android, iOS


    Joshua Robertson
    Written on June 18, 2019
    "My battery has been a problem lately and when this was recommended by a friend, I was so happy because it really does save your battery because of how it works! perfect task killer"
  3. 29

    #6ES Task Manager

    ES Task Manager
    ES Task Manager is one of the most used task killers for Android. It helps users free their devices' memory, save battery, kill tasks and speed it up. 



    Yao Yan
    Written on June 18, 2019
    "This is a must for all Android devices! Download it and see how it kills background apps that you don't need"
  4. 29

    #7Super Task Killer

    Super Task Killer

    Super Task Killer FREE is a useful tool that helps in saving energy and getting rid of any unused apps. Among many other features, this app allows deleting useless apps, and close those who haven't used in a long time. 




    Frank Jordan
    Written on June 18, 2019
    "I have deleted loads of apps i don't need because of this. This is a good way to clean up your phone for free"
  5. 22

    #8AVG AntiVirus

    AVG AntiVirus
    AVG Antivirus is a free solution that helps in removing malware and to avoid being infected by trojans, viruses and other malicious software that can harm PCs or mobile phones. Also, it's useful for finding lost phones.

    Android, Windows, Mac

    Free- with in-app purchases

    Shirley Wang
    Written on June 18, 2019
    "Not necessarily a task killer app, but it could be as it checks for malware and what not but there are more apt ways to close apps I believe"


Best What are the best task killer apps
1Advanced Task ManagerApps 122 Free
2Smart Task ManagerApps 51 Free
3Watchdog Task Manager LiteApps 41 Free
4Clean MasterApps 39 Free
5Greenify Apps 35 Free
6ES Task ManagerApps 29 Free
7Super Task KillerApps 29 Free
8AVG AntiVirus Software 22 Free

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