You asked about Time Series
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2014-01-01 | Open-source time-series data analytics extension for PostgreSQL · pipelinedb.com | acquired |
| 2010-06-01 | Real-time visibility into critical apps and services all in one place. · pagerduty.com | acquired |
| 2021-01-01 | YCDyte Real-time audio & video SDKs, ready to launch 🚀 · dyte.io | acquired |
| 2011-06-01 | Real-time. Big data. PostgreSQL · citusdata.com | acquired |
| 2014-01-01 | Next Caller creates a positive customer experience through real-time… · nextcaller.com | acquired |
| 2009-06-01 | The open source database for the realtime web. · rethinkdb.com | acquired |
| 2016-06-01 | YCSymple Last mile logistics for delivery & service teams. We bring real-time… · getsymple.com | acquired |
| 2023-01-01 | YCEzDubs Real-time speech translation · ezdubs.ai | acquired |
| 2021-06-01 | YCPactima Live video signing for real-time agreements · pactima.com | acquired |
| 2015-01-01 | Cyberfend delivers robust, real-time web and mobile security by… · cyberfend.com | acquired |
| 2012-01-01 | YCHackPad A realtime wiki for getting things done. · hackpad.com | acquired |
| 2011-01-01 | YCHotspots Real-time analytics (acq by TWTR, 2012) · moki.tv | acquired |
| 2020-01-01 | App offering AI powered workout plans with anytime access to coaches · fitnessai.com | acquired |
| 2013-06-01 | The best way to communicate with users around downtime. · statuspage.io | acquired |
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.