You asked about Energy
11 people built something like it. 2 are gone.
That is 18% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2023-01-01 | YCRUUF Managed marketplace for solar in Latam · ruuf.cl | still up |
| 2023-06-01 | YCHyLight Unmanned airships for inspecting our critical assets · hylight.aero | still up |
| 2023-06-01 | YCdili Automating Compliance for Construction · dili.com | still up |
| 2023-06-01 | YCNectar Manage energy cost & usage with AI for facility & sustainability teams · nectarclimate.com | still up |
| 2023-01-01 | YCCoperniq Workflow software for solar & energy contractors ☀️😎 · coperniq.io | still up |
| 2023-06-01 | Tracking methane emissions with satellites · orbio.earth | still up |
| 2023-01-01 | Emission free hydrogen electric aircraft · stralis.aero | still up |
| 2023-06-01 | Incentives and financing for energy efficiency upgrades · line.build | gone |
| 2023-06-01 | YCsizeless Instant 3D Digital Twins for Smarter Real Estate. · sizeless.co | still up |
| 2023-01-01 | YCAtmeto We develop ML that optimizes how batteries in the grid store energy · atmeto.com | still up |
| 2023-06-01 | AI Energy Management · trycardinal.ai | 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.