🆚 Clacks Overhead vs. JavaScript required
- 📈 JavaScript required is much more popular than Clacks Overhead.
- 🌍 JavaScript required is more popular in all countries.
- ⭐ Clacks Overhead is particularly popular in the United Kingdom.
Clacks OverheadType
About
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.
Notice on a page that 
JavaScript is required for full functionality.
Website
Popularity
Determined by the number of sites using each technology.
Market share
Popularity by country
Determined by the number of sites detected from each country.
Popularity by domain category
Determined by the number of sites in each category.
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
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ASP.NET MVC🗃️ 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 3,524,018 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.