You asked about Security
17 people built something like it. 4 are gone.
That is 31% of the ones whose fate we could settle, against 23% across the whole register. 4 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | YCCyble Cyble - World’s First Intelligence-Driven, AI-Native Security… · cyble.com | still up |
| 2021-06-01 | YCRootly AI-native on-call and incident response carefully crafted to help… · rootly.com | still up |
| 2021-01-01 | YCauthzed Authorization Infrastructure securing AI at OpenAI, Zoom, & more · authzed.com | still up |
| 2021-01-01 | AI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws · feroot.com | still up |
| 2021-06-01 | Security Delivery Platform to orchestrate AI agents for Service… · contraforce.com | still up |
| 2021-06-01 | AI-driven mobile cybersecurity · mallocprivacy.com | still up |
| 2021-06-01 | YCTarsal Data pipeline for your security data lake. · tarsal.co | acquired |
| 2021-06-01 | YCidemeum AI-powered Application Control · idemeum.com | still up |
| 2021-06-01 | Cloud and Container Security Platform · cloudanix.com | still up |
| 2021-06-01 | Never code alone. · squire.ai | gone |
| 2021-06-01 | YCTelivy Automate your cyber security risk assessments · telivy.com | acquired |
| 2021-06-01 | YCProtego We help companies recover lost revenue from chargebacks · protegosolutions.io | gone |
| 2021-06-01 | YCKeyri Secure fraud prevention and authentication platform for developers · keyri.com | acquired |
| 2021-01-01 | YCStacksi Automated Answers to Security Questionnaires · stacksi.com | acquired |
| 2021-06-01 | Web infra for AI agents · hyperbrowser.ai | still up |
| 2021-01-01 | The solution for fine-grained access control in web3 · slashauth.com | gone |
| 2021-01-01 | YCObserva Catch accidental database exposures before the bad guys · observa.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.