You asked about SMS
9 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2012-06-01 | YCPlivo Voice AI Agents for customer engagement, including WhatsApp, SMS &… · plivo.com | still up |
| 2019-01-01 | The SMS revenue platform for e-commerce merchants · postscript.io | still up |
| 2014-06-01 | YCHive Marketing automation for event promoters (email, sms, ads, CRM) · hive.co | still up |
| 2020-01-01 | YCTermii Termii is an AI-native reliability infrastructure company. · termii.com | still up |
| 2024-06-01 | YCApten Omnichannel AI agents that engage leads across SMS, voice, and email · apten.ai | still up |
| 2023-01-01 | YCOneText Frictionless payments via SMS · onetext.com | still up |
| 2023-06-01 | YCSmobi Send texts your customers actually want over RCS · smobi.com | still up |
| 2023-06-01 | AI Voice and SMS Agents for Healthcare · wattsonhealth.com | still up |
| 2024-06-01 | YCPinnacle API & SDK for RCS (the next-generation of texting) · pinnacle.sh | still up |
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.