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CTFd on new websites

Capture The Flag hacking competition and training platform.

Sites using CTFd
47
since Jul 2026
Last 30 days
0.0%
of new sites, to Oct 19
no change on the 30 days before
Last 7 days
0.0%
of new sites, 7-day average
no change on the week before
Rank in Education
#3
of 293 tools, all time
First seen Jul 9, 2026
Last seen Oct 20, 2026
Website ctfd.io

What we found

  1. CTFd appeared on 17 new sites in the last 30 days.[1]
  2. It is the third most common education technology on new sites. Moodle appears on about 10 times as many.
  3. Almost all new CTFd sites also use Howler.js.

Share of new sites using CTFd

0.0000% 0.0005% 0.0010% 0.0015% 0.0020% 10 Sep Oct

The line is the 7-day average share of new sites that use CTFd, since 10 September.

Who uses CTFd

Domain ending 47 sites
EndingSitesShareBar
.com 10 21.3%
.xyz 6 12.8%
.me 5 10.6%
.online 5 10.6%
.tech 5 10.6%
.org 3 6.4%
.dev 2 4.3%
.net 2 4.3%
.site 2 4.3%
.uk 2 4.3%
.ai 1 2.1%
.app 1 2.1%

Education on new sites

# Movement Tool Share of all sites Share of category Bar
1 – Moodle <0.1% 32.8%
2 – Scratch <0.1% 4.2%
3 ▲1 CTFd <0.1% 3.5%
4 ▲12 Udemy <0.1% 3.1%
5 ▼1 GeoGebra <0.1% 2.9%

All-time shares across the new sites we track: of all of them, and of the sites using any Education tool. All 293 in Education

Often used with CTFd

Tool Sites with both vs all new sites Bar
Howler.js 45 1997x
Alpine.js 43 145x

Tools that turn up far more often on CTFd sites than on new sites in general, and how many times as common each one is there.

Recently launched products built on CTFd

1 of the 47 sites using CTFd are product launches we list individually. The other 46 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.

Site Found Also detected
CL Labs commandlinelab.com · Developer Tools Oct 11 Alpine.js Caddy GoDaddy DNS Howler.js

Watches, exports and the API give you all 47 sites using CTFd, from £15 a month.

Notes

  1. These figures cover websites that went live since April 2026, not the web as a whole.

How this page is made

FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards CTFd when we detect CTFd on it at that look.

Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.