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Commercial? Yes
Type of site Search engine
Registration No
Available language(s) English, Portuguese, French, Czech, Italian, Dutch
Owner Heap Media Australia
Created by Toby Heap[1]
Launched January 2007
Alexa rank 5,897
Current status Active

Blackle is a website powered by Google Custom Search, which aims to save energy by displaying a black background and using grayish-white font color for search results.



The concept behind Blackle is that computer monitors can be made to consume less energy by displaying much darker colors. Blackle is based on a study which tested a variety of CRT and LCD monitors. There is dispute over whether there really are any energy saving effects.[2][3]

This concept was first brought to the attention of Heap Media by a blog post, which estimated that Google could save 750 megawatt hours a year by utilizing it for CRT screens.[1][4] The homepage of Blackle provides a count of the number of megawatt hours that have been saved by enabling this concept.


Darren Yates, a technology journalist who reviews computer hardware, tested four CRT monitors and twenty-three LCD monitors, and found that the CRT monitors did use more energy displaying a white screen, but less than the calculations made by the blog post that inspired Blackle.[5]

The LCD monitors tested showed slightly less power use displaying a white screen in the majority of cases [6], although most of the larger (24-inch) monitors did use slightly less power displaying a black screen. As of 30 January 2010, Blackle claims to have saved over 1,680 kilowatt hours.


External links

cs:Blackle de:Blackle es:Blackle fr:Blackle he:Blackle sv:Blackle th:แบล็กเกิล

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