Watch live streams and chat in real-time. From entertainment to gaming to sports events, we’ve got the best in live. And now Drake has partnered with Caffeine to bring you the world’s largest battle rap platform–URL–where you can tune in for free and watch the top battle rap MCs face off live on Caffeine. Join the best community for live entertainment, video games, and sports fans. Download Caffeine for Mac There are numerous ways that your computer system saves energy where it is not required. The most commonly noticed method of saving energy is to put the computer to sleep after a short period of inactivity.
This is the purpose of Caffeine, a small tool for Mac that keeps your computer awake so that your system won't disconnect.
Caffeine runs silently from the menu bar. An icon displaying 'Zzz' will remind you that your computer will be awake so long as it is activated.
Click the application's icon to deactivate it. If you click the icon and press the command button at the same time, you can access a small menu that will display information about the version of the application as well as its author.
Prevent your computer from going to sleep
If you have problems with your PC locking or going to sleep, caffeine will keep it awake. It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver.
The icon is shown above - it's the leftmost one in the task tray, and this is all you see. Double-clicking the icon empties the coffee pot (that's what the icon is) and temporarily disables the program. Double-clicking it again refills the pot, and will keep your machine awake.
By default the app starts enabled, and works every 59 seconds. There are some command line switches you can use to alter this behaviour:
xx- where xx is a number which sets the number of seconds between simulated keypresses. This must be the first text on the commandline
-startoff- application starts disabled.
-exitafter:xx- application will terminate after xx minutes
-activefor:xx- application will become inactive after xx minutes
-inactivefor:xx- application will become active after xx minutes
-appexit- terminates current running instance of application
-appon- makes the current running instance of the application active
-appoff- makes the current running instance of the application inactive
-apptoggle- toggles the running state of the current running instance of the application
-apptoggleshowdlg- toggles the running state, and shows dialog
-replace- closes the current running instance, replacing it
-noicon- does not show a task tray icon
-useshift- simulate the shift key instead of F15
-showdlg- shows a dialog indicating whether caffeine is active
-ontaskbar- show a task bar button (use with -showdlg)
-allowss- prevent sleep, but allow the screensaver to start
-key:xx- simulate using virtual key code xx
Note: the codes on the linked page are in Hex, convert them to decimal for use with this parameter
-keypress- simulate a full key press, not just a key up event
-oldicons- use more colourful tray icons
-darkicons- use icons which work better for dark-on-light colour schemes
-watchwindow:xx- active only when a window with xx in the title is found
-activehours:........xxxxxxxx........- put 24 . or x characters - which indicate from hour 0 to hour 23 of the day. Caffeine will be active only in hours with an x
Caffeine works by simulating an F15 key up event every 59 seconds. Of all the key presses available, F15 is probably the least intrusive, and least likely to interfere with your work.
However, Caffeine might interfere with some apps:
- PowerPoint uses the F15 keypress to pause video in a slide
- Google Docs/Sheets
- Terminal emulation, e.g. Putty
If you think any of these might cause you a problem, set the
-useshift command line parameter.
Caffeine user humancar2n has put together a short YouTube video showing how the app works.
Do you need this functionality on your Mac? Lighthead Software have written a separate app, also named Caffeine, which can help you out.
v1.90 - October 2020
-darkicons command line option added
-activehours command line option added
Tooltip replaced with a new one which works more reliably
Menu appearance updated
v1.81 - May 2020
Bug with the
-watchwindow command line fixed
v1.80 - January 2020
v1.64 - September 2017
Option for old icons added, 'cos not everyone likes the new ones
v1.63 - February 2017
Icons updated slightly to show up better on a white background.
v1.62 - April 2016
New icons, designed by Rubén Gómez Radioboy
v1.61 - October 2015Fixed bug with app not going active/inactive correctly when a timed period elapsed
v1.60 - July 2013
New command line options:
Added menu items to go Active/Inactive
Type in About box corrected
-apptoggle will re-show the dialog if it was originally shown
v1.50 - November 2010
New command line options:
Simulated keypress changed from right context menu key to F15 as this is likely to be even less intrusive.
v1.40 - July 2009
New command line options:
Hovering over the tray icon now shows the status of the app
v1.35 - May 2009
Caffeine For Mac
Simulated keypress changed from shift to the right context menu key (at the suggestion of Kevin Kleinfelter) as this is likely to be less intrusive.
v1.30 - February 2009
Command line switches added to terminate the app after x minutes, disable the app after x minutes, and enable or disable the currently running instance of the app
v1.20 - March 2008
Download Caffeine Mac
Command line switches added to set the interval and to start disabled