You asked about Climate
10 people built something like it. 10 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Mobile Energy Storage Technology · moxionpower.com | gone |
| 2021-06-01 | Home electrification at $0 upfront cost · solarmente.es | gone |
| 2021-01-01 | The fastest and easiest way to make home upgrades · homebreeze.ai | gone |
| 2021-06-01 | YCPerfekto Grocery subscription service against food waste in Latam · perfekto.mx | gone |
| 2021-06-01 | YCHeimdal Affordable and verified direct air carbon capture and storage · heimdalccu.com | gone |
| 2021-06-01 | YCJupe Just add land · jupe.com | gone |
| 2021-01-01 | YCNoya Radically reducing capital costs and build time for direct air capture · noya.co | gone |
| 2021-06-01 | Revolutionizing digital selling within HVAC · onsitepro.co | gone |
| 2021-06-01 | YCCanopi API to measure and eliminate carbon emissions · canopi.cash | gone |
| 2021-06-01 | Technologies for scaling up cultured/clean meat production · micromeat.com | gone |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.