What's New

Version 2.3

  • App Tamer now requires macOS 10.8 or higher.
  • New "Detection" feature that alerts you when an application or background process starts consuming excessive CPU time.
  • Updated user interface that's consistent with the look of El Capitan and Sierra.
  • App Tamer will no longer stop iTunes when iTunes is ripping a CD.
  • When it launches, App Tamer now automatically quits any other copies that are running.
  • All Spotlight indexing processes (and their aggregate CPU usage)are now displayed as a single task.
  • Fixed a bug where App Tamer considered the frontmost app "in the background" when you clicked on App Tamer's icon in the menubar.
  • Eliminated a crash that could occur when macOS supplies incomplete process information to App Tamer.
  • Fixed VoiceOver support in the Quick Start windows.
  • App Tamer will never stop VoiceOver.

Version 2.2

  • Compatible with macOS 10.12 Sierra.
  • Improved App Tamer's efficiency when managing lots of processes.
  • Made App Tamer much more intelligent about stopping and starting helper processes such as Safari Web Content, Safari Networking, Google Chrome Helper, etc.
  • Made contextual menus (when clicking on processes in App Tamer) behave consistently.
  • Fixed problems with text not fitting correctly when running on French systems.

Version 2.1

  • Compatible with El Capitan.
  • Updated support for NetNewsWire,the App Store app, Go for Facebook, Leaf, Reeder and Fluid browsers.
  • Improved "Show in Finder" so that it works with system daemons and other non-application processes.
  • Refined the logic that detects when App Tamer is having trouble monitoring Chrome's download activity.
  • The AppleScript command for turning autostop on and off now returns the old setting as its result.

Version 2.0.5

  • If your Mac has more than four processor cores, you'll now get a dialog offering to change the cpu history graph to a logarithmic scale. This mode shows much more detail when cpu usage is a lower percentage of total capacity (which is very common because you're rarely using all cpu cores on 8 and 16 core Macs).
  • Fixed problems with 64-bit Safari plugins not being stopped and started correctly.
  • App Tamer now shows more helpful error messages when it can't connect to the internet to validate your license number.
  • When installing its helper application, App Tamer will try to fix permission errors for you when it encounters them.
  • When App Tamer reenables itself after being turned off for a period of time, it now displays a notification in Notification Center on Mac OS 10.8+ .
  • Corrected a bug that would mistakenly hide both stopped and slowed apps when the "Hide applications when they are stopped" setting was turned on in your preferences. Now App Tamer doesn't hide apps that have just been slowed down.
  • Improved the appearance of the CPU history graph.

Version 2.0.4

  • App Tamer has been updated to fully support Mac OS 10.10 Yosemite.

Version 2.0.3

  • When a process is limited to a certain amount of CPU usage, that limitis now displayed next to the process’ name in App Tamer's window.
  • Corrected an issue that could cause App Tamer to incorrectly limit theCPU usage of an application in certain situations.
  • Fixed a problem where App Tamer could cause applications to hang whenrestarting or shutting down your Mac.
  • Fixed a rare bug that could cause App Tamer to crash when some OS X servicesreturn an error.

Version 2.0.2

  • Fixed a problem with App Tamer sometimes failing to slow down a processeven when you’ve specified a CPU limit for it.
  • Added a small highlighted corner in the status indicators to show whether a running application has been configured to slow down or stop.
  • Fixed a bug that could cause App Tamer to crash when it started up under certain conditions.

Version 2.0.1

  • Corrected a bug that caused App Tamer to fail to turn itself back on after being turned off.
  • Improved App Tamer’s efficiency dramatically when dealing withapplications that have many subprocesses (like Safari, Chrome andTerminal).
  • App Tamer no longer gets stuck if you enter an invalid value for the %CPU limit in an application’s settings.
  • When the parent process of an application quits, the application ismade visible in App Tamer’s process list and has a settings panelthat will let you slow and stop it. This affects Arq and VLCStreamer,as well as other applications
  • You can now enter a value of zero for the amount of time to turn App Tamer off if you want it to stay off indefinitely.
  • Corrected a problem with App Tamer repeatedly printing warnings in the console log if the Dock is relaunched.
  • Fixed a situation where App Tamer would crash when a process launchedadditional copies of itself.

Version 2.0

  • A new, streamlined user interface. Everything is available directly from your menubar. Hover over an application to see its performance, click on it to change its settings.
  • The ability to limit apps to a certain amount of CPU, rather than just stopping them. This makes App Tamer compatible with many more applications, including Spotlight, Time Machine and Mail.
  • Greater efficiency and responsiveness, bug fixes, and other good thingsthat result from lots of testing and refinement.
  • Full compatibility with Mac OS 10.9 Mavericks and its App Nap feature.

Version 1.3.2

  • Added Retina display support.
  • App Tamer now wakes up applications for scroll wheel and gesture scrolling even when they're in the background.
  • Applications wake up when the display configuration changes so they can switch window configurations if necessary.
  • Errors were fixed that caused warning messages in the Console under some circumstances.
  • Fixed bugs in handling the consequences of high CPU load.

Version 1.3.1

  • The "AutoStop only when on battery" setting is now more logical, and has been renamed "Don't AutoStop when plugged in and battery is above xx%".
  • Added the ability to detect downloads in uTorrent 1.7.4 when its "Append!ut extension to incomplete files" setting is turned on.
  • App Tamer's modal dialogs no longer lock out its AutoStop stop/start handling.

Version 1.3

  • You can now set up App Tamer to only use AutoStop when your battery chargeis below a certain percentage. Doing this will minimize battery drain whenyou are not plugged in, speed recharge time when you are plugged in, andwill otherwise keep AutoStop turned off.
  • App Tamer now offers several AppleScript commands that let you to turn AutoStop on and off in your AppleScripts, as well as wake a stopped application.
  • A problem has been fixed that could cause helper applications for yourweb browser to get stuck, sometimes freezing the browser.
  • On some machines, disabling AutoStop for a specified number of minutesdidn't work - it would always turn back on after 5 minutes. This has beenfixed.

Version 1.2.1

  • AppTamer could fail to get all information about some applications (such astheir icons or process identifiers) while OS X was very busy. This couldresult in AutoStop not working with those applications until you quit andrelaunched App Tamer.
  • The menubar menu did not work correctly under Mac OS 10.5. This hasbeen fixed.

Version 1.2

  • App Tamer's menubar icon now displays CPU usage in a number of ways.The needle on the icon moves to reflect processor load, the icon can be colorized so it turns yellow and then red as usage increases, and you can also display the CPU usage numerically next to the icon.
  • Problems have been fixed so that App Tamer correctly sees all processeslaunching and quitting. In version 1.1.2, it would occasionally lose trackof an application or show an application twice.
  • If App Tamer's icon is not in the Dock, double-clicking on App Tamerwhen it's already running will open its window.

Version 1.1.2

  • App Tamer's CPU requirements have been reduced substantially, especiallyin situations where applications launch and quit often.
  • Added status info to let you know why AutoStop is disabled when you'vegot the "AutoStop only when running on battery" preference turned on andyour computer is not running on battery.
  • App Tamer now stops additional helper applications for Safari and Firefoxwhen the browsers are stopped (Safari Webpage PreviewFetcher, com.apple.Safari.SyncClient, com.apple.PubSubAgent, org.mozilla.plugincontainerand org.mozilla.updater).
  • Added support for custom web browsers created by Fluid.app.

Version 1.1.1

  • Corrected performance problems caused by processes that relaunch very frequently (often without yourknowledge).This change keeps App Tamer from using too much CPU time on affected Macs.
  • Fixed compatibility with Alien Skin Photoshop plugins.

Version 1.1

  • Significantly reduced the amount of CPU required by App Tamer, especiallywhen the "Details" drawer isclosed.
  • The "Details" drawer now reminds you to close it if you leave it openfor more than 2 minutes.
  • Corrected a high-cpu usage condition when the system wakes from sleep.
  • Eliminated some stability issues in Mac OS 10.7 "Lion."
  • Fixed a bug that could leave some processes running but with their windowsdimmed like they're stopped.
  • Arq and DockIt are now shown in themenubar menu even if they are not using CPU so you can easily control them.

Version 1.0.9

  • Corrected a problem with gaming mode turning itself off when switching between applications.

Version 1.0.8

  • Gaming mode now stops Time Machine backups and Spotlight indexing as well as background applications.
  • Fixed a crash that could occur when waking from sleep when running under Lion.
  • Eliminated Console error messages when running under Lion.
  • App Tamer now dims/undims windows correctly when "autostop only when on battery" is turned on and you unplug or plug in the power adapter.
  • Screensaver plugins that use WebKit no longer freeze when Safari is AutoStopped.
  • Reeder no longer freezes when Safari is AutoStopped.

Version 1.0.7

  • Corrected a bug which would cause App Tamer to repeatedly pause for several seconds on some machines.

Version 1.0.6

  • App Tamer's download monitoring has been updated so it will not stop Firefox4 or newer versions of Google Chrome while you are downloading files.
  • Fixed a bug that could result in applications not being restarted when they were brought to the front.
  • Found and fixed two problems that could cause App Tamer to consume more CPU time than it should.
  • Corrected a problem that could causeParallels Desktop 5 to stay AutoStoppedwhen it shouldn't.
  • Modified the priority slider to be more understandable.
  • Identified the source of isolated installation problems. Some users have incorrect permissions set on the /Library/PrivilegedHelperTools folder. These need to be fixed before App Tamer can install its helper application or there is a risk of leaving a security hole. Contact support@stclairsoft.com for assistance if you encounter this problem.

Version 1.0.5

  • Right-clicking on a stopped application reveals a contextual menu that allows you to turn AutoStop off and quit, force quit, or relaunch the application.
  • This version works around an issue that caused Parallels Desktop to freeze your keyboard and mouse for a few seconds when it was autostopped.
  • App Tamer now works with the developer seed of Mac OS X 10.7 "Lion."

Version 1.0.4

  • Corrected a problem that could cause the CPU history graphs to stop updating.
  • Fixed an error in the license engine that could make some licenses fail to validate.

Version 1.0.3

  • You can now choose to hide an application when it is AutoStopped.
  • A new setting lets you change the amount of time that App Tamer gives newly-launched applications before it enables AutoStop.
  • The main window has more space for the list of stopped applications. The list now also includes the %CPU saved for each app and is sorted by the amount saved.
  • CPU savings in the menubar menu and in the list of stopped apps are now calculated as a percentage of all available CPU's, not as a percentage of 1 processor. This is different from the %CPU listed in the Details drawer, which is shown as a percentage of one CPU so that the numbers are consistent with Activity Monitor. This means that if you stop an app that's reported as using 100% CPU by Activity Monitor or App Tamer's Details list, it will only show as a savings of 50% on a dual core Mac, 25% on a quad core Mac, etc.
  • Holding down the Option key while choosing "Disable AutoStop" from the menubar menu now turns it off indefinitely, rather than prompting you for the number of minutes to turn AutoStop off.
  • Fixed the "Disable AutoStop…" command so that it consistently reenables at the correct time. In version 1.0.2, if you disabled AutoStop for a specified period, reenabled it again manually, and then disabled it again, the delay-before-reenabling didn't work correctly.
  • App Tamer will no longer stop Safari if it's downloading files of type mov, mp4, flv, divx, wmv, mms, or rm. This fixes a problem with CosmoPod.
  • Some pages in NetNewsWire's browser would not display correctly if Safari was also running and was AutoStopped. This has been fixed.
  • App Tamer is now more tolerant of very slow machines so it doesn't keep asking to reinstall its helper application.
  • The license window is smarter so that it won't try and re-authorize an already-licensed copy of App Tamer.
  • There is no longer a long lag in AutoStopping applications when the CPU statistics update time is set to 10 or 15 seconds.
  • Fixed a bug in handling Fast User Switching that could leave App Tamer running in an account that you'd switched away from.
  • Corrected the helper application settings for Dreamweaver so BBEdit will continue to run when using Dreamweaver.
  • Fixed a bug in the French version - "Disable AutoStop..." did not bring up the delay prompt as it should have.
  • Fixed an incorrect status message that would be shown after waking from sleep if AutoStop was turned off.
  • Added an expert option to turn off the drawer animation. Use this command in Terminal: defaults write com.stclairsoft.AppTamer noAnimation 1
  • Added BBEdit as a helper application for Xcode. This is necessary because if BBEdit is running, Xcode checks in with it before doing a build to see if any project files have been changed by BBEdit.
  • Developer feature: You can now declare helper applications in your info.plist file. App Tamer will stop and start helper apps along with your application, so if your app needs to make sure that iTunes stays awake while it's running, you can add this to your info.plist: <key>AppTamerHelperIdentifiers</key>

Version 1.0.2

  • App Tamer is now more efficient so it it consumes less CPU power itself.
  • The status menu in the menubar now shows CPU usage and savings.
  • Choosing 'Disable AutoStop' from the menubar menu will ask how long to disable it. AutoStop will be automatically reenabled after that time has elapsed.
  • App Tamer now automatically determines if an application is a 'helper' for a game or other application, and will keep it awake or put it to sleep along with its parent application.
  • App Tamer will no longer stop iTunes if it is playing music or a movie.
  • Status alerts have been added to make the Details drawer more understandable.
  • You can relaunch applications from the Application Manager's contextual menus.
  • When switching between accounts using Fast User Switching, App Tamer will automatically disable itself when you switch away from the account in which it's running and will turn itself back on when you return.
  • Problems detecting downloads have been fixed. App Tamer will not stop browsers when they are downloading files.
  • OS X's spindump utility is now turned off when App Tamer starts up. This corrects performance problems and stuttering that some users have reported.
  • App Tamer no longer automatically opens its window when you bring it to the front.
  • If App Tamer is set as a login item with the 'hide' checkbox turned on, it will now be properly hidden after login.
  • Under Mac OS 10.5, kernel_task will no longer include all idle cpu time - its %CPU value is now reported correctly.
  • Problems with incorrect window dimming and undimming have been fixed.
  • When dimming the Finder's windows, the Desktop will no longer dim along with its windows.
  • Corrected a problem which caused windows to brighten and then dim again while apps were stopped in the background.
  • When App Tamer isn't frontmost, the on/off switch is disabled so clicking to bring App Tamer to the front doesn't accidentally change the setting.
  • The 'awake' period is now longer after the computer wakes from sleep (10 seconds instead of 5).
  • App Tamer now knows details about Parallels Desktop so that its background processes are properly stopped and started along with it.
  • Added application-specific warnings for Default Folder X.
  • There is now a manual preference option to hide applications when they're AutoStopped. To turn it on, quit App Tamer and then use this command in Terminal:defaults write com.stclairsoft.AppTamer hideWhenStopped 1 To turn the feature back off, use: defaults write com.stclairsoft.AppTamer hideWhenStopped 0
  • When window dimming is turned on, the brightness of the dimmed windows can be modified with a defaults setting. Run this command in Terminal (the default value is 65% - lower percentages are darker, higher percentages are brighter): defaults write com.stclairsoft.AppTamer dimPercentage 65

Version 1.0.1

  • If you clicked in the Dock and then immediately quit App Tamer, it would leave some applications' windows grayed out (though the apps were actually running). This has been fixed.
  • AutoStop will not stop an application until it has been running for more than 30 seconds. This prevents most applications from getting stopped before they finish launching.
  • If App Tamer can't communicate with its helper application, it complains and tries to relaunch it. This would sometimes happen erroneously if your machine was running very slowly. App Tamer has been modified to account for this situation.
  • If you are running both Flash Player and Flash (when debugging Flash projects, for example), App Tamer will keep both of them running if either one is in front, even if you have AutoStop turned on for Flash.
  • App Tamer no longer warns you about a conflict with Witch because the new release of Witch fixes the problem. See http://manytricks.com/witch/ for more information.
  • App Tamer is now more efficient so it uses less CPU time itself.

Version 1.0

  • First public release.


App Tamer (com.stclairsoft.apptamer) is a Mac software application that has been discovered and submitted by users of Software.com. The latest version that our users have reported running on their systems is App Tamer 2.3. The most popular version of this application used by our users is App Tamer 2.2b2.

Operating System: Mac

Minimum OS version: 10.8

Copyright: Copyright 2010-2017 St. Clair Software. All rights reserved.