carbon.txt on new websites
Open standard for publishing verifiable claims about the energy and carbon footprint of a website and its hosting.
Found via: StackScope Discovery (Indie) 1 · StackScope Wider Web 5
carbon.txt appeared on 5 new sites in the last 30 days.
These figures cover websites that went live since April 2026, not the web as a whole.
Share of new sites using carbon.txt
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
The shaded area was measured against a different set of sites, so the line can step there without carbon.txt itself changing.
Coverage details
Amber: 8 July to 10 September 2026, before we improved our infrastructure to index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from 10 September. We record each site as it was when we found it.
The share is a proportion of whatever we were tracking at the time. For a single continuous measure, switch to launch platforms.
Protocol leaders
| Tool | % of sitesall time | % of categoryall time | ||
|---|---|---|---|---|
| #1 | – | HTTP/3 | 50.7% | 100.1% |
| #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
Current page
|
<0.1% | <0.1% |
Percentages show all-time adoption across the new sites we track: the share 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 22 in Protocol →
Recent launches using carbon.txt
1 of the 6 sites using carbon.txt are product launches we list individually. The other 5 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. They are included in the StackScope API and in Stackdar alerts. How StackScope Discovery works
The StackScope API serves all 6 sites using carbon.txt, filterable and exportable, from £15 a month.