Clacks Overhead

Clacks Overhead is a feature based on the concept of semaphore towers from the Discworld fantasy book series written by Sir Terry Pratchett, an English author and humorist.

It was devised by Reddit users and allows websites to broadcast a message to the world via the non-standard X-Clacks-Overhead HTTP header. This message is usually dedicated to the memory of Terry Pratchett, reading "GNU Terry Pratchett", though it can contain any text.

According to our data, Clacks Overhead is detected on 0.06% of all websites.

Statistics based on 3.5M+ analyzed websites. About this data

📊 Rankings and Market Share

⚡ Sites Using Clacks Overhead

We have data on 2,022 websites that use Clacks Overhead technology. Here is a list of some of the top ranked ones.

The highest rated site using Clacks Overhead is stackoverflow.com.

#WebsiteRankCountryLanguage
1 stackoverflow.com #101 English
2 heise.de #325 Germany German
3 marksandspencer.com #470 United Kingdom British English
4 archiveofourown.org #585 English
5 stackexchange.com #1,002 English
6 mozilla.org #1,003 English
7 firefox.com #1,362 United States English
8 theregister.com #1,840 English
9 ubuntu.com #2,223 United Kingdom English
10 taz.de #2,481 Germany German
11 superuser.com #2,837 English
12 drive2.ru #2,928 Russia Russian
13 coolblue.nl #2,995 Netherlands Dutch
14 pixeldrain.com #3,436 United States English
15 dnevno.hr #3,846 Croatia Croatian
16 zagreb.info #4,522 Croatia Croatian
17 askubuntu.com #5,488 English
18 debian.org #6,931 United States English
19 docs.python.org English
20 pythonanywhere.com #7,641 English

📈 Usage Statistics

Most of the sites that use Clacks Overhead:

Most of the sites using Clacks Overhead are from the United Kingdom, the United States, and Germany.

  • United Kingdom 23.1%
  • United States 17.2%
  • Germany 15.5%
  • France 6.2%
  • Czech Republic 4.3%
  • Netherlands 4.2%
  • Canada 3.5%
  • Norway 2.3%
  • Spain 1.9%
  • Other 21.8%

Most Clacks Overhead users speak English, German, or French.

  • English 74.2%
  • German 8.8%
  • French 3.2%
  • Czech 2.9%
  • Spanish 1.4%
  • Dutch 1.4%
  • Russian 1%
  • Danish 0.8%
  • Croatian 0.8%
  • Other 5.5%

Clacks Overhead technology is especially popular on .com, .org, and .de top-level domains.

  • .com 37.2%
  • .org 12.7%
  • .de 7%
  • .co.uk 5.7%
  • .net 4.8%
  • .cz 2.7%
  • .org.uk 1.8%
  • .no 1.1%
  • .eu 1.1%
  • Other 25.9%

The primary market segments for websites utilizing Clacks Overhead include entertainment, business, and blogs and wiki.

  • Entertainment 10.3%
  • Business 9.4%
  • Blogs/Wiki 8.4%
  • Software/Hardware 7.7%
  • Internet Services 7.3%
  • Education/Reference 6.7%
  • Marketing/Merchandising 5.9%
  • Online Shopping 5.4%
  • Games 4.8%
  • Other 34.1%

🕵️ Similar Technologies

These are some of the best Clacks Overhead alternatives.

RankName
1
Charset
Cambridge, Massachusetts, United States

Declaration directive, specified via an HTML meta tag or HTTP headers, defines the character encoding used to interpret text in a web document.
2
Meta Robots
Fremont, California, United States

Robots directives are instructions delivered through the robots meta tag or the X-Robots-Tag HTTP header that control how search engines and web crawlers index, cache, and process web content.
3
Multi-language

Multiple languages specified by with the hreflang attribute.
4
Gravatar
San Francisco, California, United States

A profile management system that allows users to create profiles linked to their email addresses instead of their names.

Free
5
JavaScript required

Notice on a page that JavaScript is required for full functionality.

🆚 Compare Alternatives

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💬 Frequently Asked Questions

Which country uses Clacks Overhead the most?

The majority of Clacks Overhead users are from the United Kingdom.

Who uses Clacks Overhead?

According to our data, Clacks Overhead is used on thousands of sites, including such established ones as stackoverflow.com, heise.de, and marksandspencer.com.

Do academic institutions use Clacks Overhead?

Yes. Overall, we know of 2 academic websites in the United States that use Clacks Overhead.

How does Clacks Overhead compare to the competition?

Clacks Overhead is a moderately popular other technology, ranking ahead of 6 other other technologies we track.

What are the alternatives to Clacks Overhead?

Alternatives and possible competitors to Clacks Overhead may include Charset, Meta Robots, and Multi-language.

🗃️ About This Data