Caffeine is a simple application that, while active, will avoid your computer going on standby. Even though this function can be configured through the System Preferences, with this software you'll always have a small cup of coffee, on the right side of the menu bar, available to save you time.
A shot of caffeine for your Mac
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If the coffee cup is full or active, the computer won't go to sleep. This is really useful when we're watching a film, we have a download application running, or we simply don't want our Mac to fall asleep. With a simple click on the cup, it will appear empty, and Caffeine will be deactivated. Therefore, the computer will go to sleep whenever it's configured to do so.
Avoid your computer from falling asleep, whatever it takes.
Caffeine has a simple set of options that can be seen by right-clicking on its icon. By means of these options we'll be able to program the application to stay active during a specific amount of time, that can range from 5 minutes to 5 hours. We can also configure if the application will open when the system starts, and it will activate then.
With Caffeine you'll be able to watch films on your Mac without it going to sleep, no matter what configuration you have. You'll only have to worry about not falling asleep yourself.
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.
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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
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.
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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
Command line switches added to set the interval and to start disabled