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carbon.txt on new websites

Open standard for publishing verifiable claims about the energy and carbon footprint of a website and its hosting.

Sites using carbon.txt
6
since Aug 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 Protocol
#8
of 23 tools, all time
First seen Aug 5, 2026
Last seen Oct 7, 2026
Website carbontxt.org

What we found

  1. carbon.txt appeared on 4 new sites in the last 30 days.[1]

Share of new sites using carbon.txt

0.0000% 0.0002% 0.0004% 0.0006% 0.0008% 10 Sep Oct

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

Protocol on new sites

# Movement Tool Share of all sites Share of category Bar
1 – HTTP/3 50.5% >99.9%
2 – Tor Onion Service <0.1% <0.1%
3 ▼3 United States Semantic Standard <0.1% <0.1%
4 ▼1 I2P <0.1% <0.1%
5 ▼1 njump <0.1% <0.1%
…
8 ▲7 carbon.txt <0.1% <0.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Protocol tool. Among September launches it ranked #3 in Protocol, up from #10 in August. All 23 in Protocol

Recently launched products built on carbon.txt

1 of the 6 sites using carbon.txt are product launches we list individually. The other 5 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
Migration vers WordPress natif sans perdre son SEO | RemakeWP remakewp.fr · France Sep 26 Hosterra nginx Ollie PHP

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 If a technology shown here is wrong or out of date, email [email protected] and we'll review it.