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AppKiller is a simple menu bar application that allows the user to quickly kill running applications. In addition, AppKiller allows the user to send any of the underlying BSD signals to any process on the system including those owned by other users, including root.

AppKiller is useful for killing or otherwise controlling processes without resorting to the command line or firing up heavier-weight applications such as Activity Monitor; of particular use if the system is experiencing performance issues. Any BSD signal can be sent.

What's New

Version 0.96:
  • Rewritten GUI: Simpler, more responsive. More intuitive sort.
  • Send Signal To Multiple Processes: Several processes can now be selected and a signal sent to all of them at once.
  • Performance: AppKiller is more responsive and places considerably less load on your system.


  • OS X 10.7 or later

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AppKiller User Discussion

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Quantumpanda Member IconComment+23

Does AppKiller have any issues with OS X 10.9 Mavericks? I upgraded to Mavericks today, and now every time I try to launch the app, it immediately crashes. This happens even after trashing the plist. I even tried downloading a fresh copy, but same problem.

Reply2 replies
Version 0.942
serialangels (Developer)


I've not had any problems reported so far - is there an error message when it crashes?

If you're able to e-mail at feedback@serialangels.co.uk we can figure out what's happening.




Just the Crash Reporter log. I'll email the log to you.

7h31ll3g4l Member IconComment+13

you can adjust the size of the icon in the menubar to make it the same size of the system icons in the menubar believe the latter just let emodo collendolo to change it to a tiff or png


Reply0 replies
Version 0.9.3
Raven. Member IconReview+46

Works fine. No problems at all... The killing is fast painless.

Reply0 replies
Version 0.9.1
Gregm Member IconComment+213

Minimum OS10.7 here --- minimum 10.8 on developers website. I have sent a WTH enquiry.

Reply3 replies
Version 0.9.1


I'm seeing this on the dev's site: "AppKiller is available to download, for free, here. It is a 64-bit application and runs on Mac OS X 10.7 or later. It requires an Administrator password for the initial installation."

Are you seeing 10.8 somewhere?


Developer responded: "Hi Greg,

Thanks for the e-mail - the latest version of AppKiller should run with no problems on Lion.

We've corrected the mismatch on the web page too - thanks!

I've downloaded and will smoke-test it.

serialangels (Developer)


The new beta version should run under 10.7. We're seeing some reports of problems relating to code signing. If you do have problems please let us know via e-mail at feedback@serialangels.co.uk and we'll work to get things fixed.

Many thanks!

Derekcurrie Member IconComment+713

NOT compatible with 10.7:

Despite the developer website claim that this app runs on 10.7, it DOES NOT. When you attempt to run the app it reports:

"You can't use this version of the application AppKiller.app with this version of Mac OS X. You have Mac OS X 10.7.5. The application requires Mac OS X 10.8 or later.

This is a developer documentation blunder, not MacUpdate's fault.

Reply1 reply
Version 0.9
serialangels (Developer)

Hi Derek,
This has now been fixed, thanks again for letting us know!

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> 3 2


Current Version (0.x)


Downloads 3,165
Version Downloads 777
Type Utilities / System
License Free
Date 03 Dec 2013
Platform Intel 64 / OS X
Price Free
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