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 ranks 12th among the other technologies we track.
It is detected on 0.06% of all websites.
It is especially popular in the United Kingdom, appearing on 0.2% of all websites in the country.
- 🏠 Website
- 🔗 Links
- 🔌 Add-Ons
Discworld
Chrome📊 Rankings and Market Share
- Other
- Rank: 12
- Market share: 0.07%
⚡ Sites Using Clacks Overhead
We have data on 2,315 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 archiveofourown.org.
| # | Website | Rank | Country | Language |
|---|---|---|---|---|
| 1 | #610 | English | ||
| 2 | #727 | Russia | English | |
| 3 | #1,011 | Germany | German | |
| 4 | #1,038 | United States | English | |
| 5 |  firefox.com |
#1,444 | United States | American English |
| 6 | #1,917 | United States | English | |
| 7 | #2,005 | Germany | German | |
| 8 | #2,122 | United Kingdom | British English | |
| 9 | #3,309 | Russia | Russian | |
| 10 | #3,355 | United States | English | |
| 11 | #4,231 | Croatia | Croatian | |
| 12 | #4,605 | United States | American English | |
| 13 |  ubuntu.com |
#5,284 | United Kingdom | English |
| 14 | #5,925 | Netherlands | Dutch | |
| 15 | #6,139 | United Kingdom | English | |
| 16 | #6,141 | Netherlands | Dutch | |
| 17 | #6,223 | Canada | English | |
| 18 |  debian.org |
#6,434 | United States | English |
| 19 | canonical.com |
#6,506 | United Kingdom | English |
| 20 | United States | English |
📈 Usage Statistics
Most of the sites that use Clacks Overhead:
- are located in the United Kingdom
- have content in English
- use the .com domain extension
- fall into the Entertainment category.
Most of the sites using Clacks Overhead are from the United Kingdom, the United States, and Germany.
- United Kingdom 23%
- United States 18.7%
- Germany 14.5%
- France 5.1%
- Czech Republic 4.5%
- Netherlands 3.7%
- Canada 3.3%
- Norway 2.5%
- Spain 1.9%
- Other 22.8%
Most Clacks Overhead users speak English, German, or Czech.
- English 73.9%
- German 8.7%
- Czech 3.1%
- French 2.9%
- Dutch 1.5%
- Spanish 1.3%
- Russian 1%
- Danish 0.8%
- Croatian 0.8%
- Other 6%
Clacks Overhead technology is especially popular on .com, .org, and .de top-level domains.
- .com 36.8%
- .org 12.3%
- .de 6.9%
- .co.uk 5.8%
- .net 4.9%
- .cz 2.8%
- .org.uk 1.4%
- .no 1.3%
- .eu 1.1%
- Other 26.7%
The primary market segments for websites utilizing Clacks Overhead include entertainment, business, and blogs and wiki.
- Entertainment 10.1%
- Business 9.9%
- Blogs/Wiki 9%
- Software/Hardware 7.2%
- Marketing/Merchandising 6.6%
- Internet Services 6.4%
- Education/Reference 5.7%
- Online Shopping 5%
- Games 4.4%
- Other 35.7%
🕵️ Similar Technologies
These are some of the best Clacks Overhead alternatives.
🆚 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 archiveofourown.org,
imgsrc.ru, and
heise.de.
Do academic institutions use Clacks Overhead?
Yes. The most notable of these is qub.ac.uk. Overall, we know of 2 academic websites in the United States that use Clacks Overhead.
How does Clacks Overhead stack up against 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
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 3,953,682 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.