Codeforces on new websites

Competitive programming platform hosting contests and a problem archive.

Sites using Codeforces
6
since Jul 2026
Last 30 days
0.0%
of new sites, to Oct 22
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 Developer Tools
#149
of 513 tools, all time
First seen Jul 10, 2026
Last seen Sep 26, 2026
Website codeforces.org

What we found

  1. Codeforces appeared on 2 new sites in the last 30 days.[1]

Share of new sites using Codeforces

0.0000% 0.0002% 0.0004% 0.0006% 16 Sep Oct

The line is the 7-day average share of new sites that use Codeforces, since 16 September. It starts at our first detection.

Developer Tools on new sites

# Movement Tool Share of all sites Share of category Bar
1 – Vite 23.7% 98.3%
2 – pywb (Wayback Machine toolkit) 0.1% 0.3%
3 ▲1 Instant.page 0.1% 0.2%
4 ▼1 Weglot <0.1% 0.2%
5 ▲2 Rack CORS <0.1% 0.1%
6 – Istio <0.1% 0.1%
7 ▼2 Adobe Flash (AC_RunActiveContent embed script) <0.1% 0.1%
8 – Google Apps Script <0.1% 0.1%
9 – Rspack <0.1% 0.1%
10 – Jam <0.1% 0.1%
11 – VSCode for the Web <0.1% 0.1%
12 – Quarto <0.1% <0.1%
…
149 Codeforces <0.1% <0.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Developer Tools tool. All 513 in Developer Tools

Recently launched products built on Codeforces

5 of the 6 sites using Codeforces are product launches we list individually. The other 1 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.

Watches, exports and the API give you all 6 sites using Codeforces, 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 Codeforces when we detect Codeforces 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 If a technology shown here is wrong or out of date, email [email protected] and we'll review it.