You asked about Cybersecurity
34 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 |
|---|---|---|
| 2019-06-01 | YCTRM Labs TRM is building a safer world for billions of people. · trmlabs.com | still up |
| 2016-01-01 | Protects organizations from getting breached through their APIs. · salt.security | still up |
| 2020-01-01 | YCRiot Cybersecurity awareness for fast growing companies · tryriot.com | still up |
| 2024-01-01 | Autonomous offensive and defensive cybersecurity platform · codeant.ai | still up |
| 2019-01-01 | YCMedCrypt MedCrypt gives medical device vendors cybersecurity features in a few… · medcrypt.co | still up |
| 2022-06-01 | Enterprise software for enterprise risk and cyber fraud intelligence · overwatchdata.ai | still up |
| 2023-01-01 | The Control Plane for Enterprise Agents · credal.ai | still up |
| 2020-01-01 | YCSkypher AI agent for Compliance Questionnaires Automation · skypher.co | still up |
| 2023-01-01 | YCVariance AI Agents for Fraud Review and Investigations · variance.com | still up |
| 2020-06-01 | YCFormal Take control of your data in real-time. · joinformal.com | still up |
| 2024-06-01 | YCZeroPath Automatically find and fix your software vulnerabilities · zeropath.com | still up |
| 2021-06-01 | AI-driven mobile cybersecurity · mallocprivacy.com | still up |
| 2025-09-01 | YCComplyDo Global Compliance for Enterprises · complydo.io | still up |
| 2024-06-01 | YCUnbound Use AI tools without fear of data leakage · getunbound.ai | still up |
| 2023-06-01 | YCCorgea Corgea finds, and fixes insecure code and packages autonomously. · corgea.com | still up |
| 2025-06-01 | YCGhostEye Your always-on red team. · ghosteye.ai | still up |
| 2025-09-01 | YCAntigen Continuous offensive security for the enterprise. · antigen.sh | still up |
| 2026-06-01 | YCCaution Hosting platform for software you can't afford to have hacked · caution.co | still up |
| 2023-06-01 | Firmware cybersecurity · metalware.com | still up |
| 2026-06-01 | Autonomous AI defense system for cyber attack · nebusec.ai | still up |
| 2026-06-01 | YCTrident Autonomous offensive security agents. The best defense is offense · tridentsecurity.io | still up |
| 2026-06-01 | AI cybersecurity for financial institutions' digital assets · verdictmachine.com | still up |
| 2025-01-01 | YCCandor Protect your data and stop insider risk · candor.security | still up |
| 2025-01-01 | YCArchon We help software companies sell to government. · archon.inc | still up |
| 2025-09-01 | Continuous AI pentesting that finds and fixes vulnerabilities · verialabs.com | still up |
| 2026-06-01 | CrowdStrike for AI Agents · traceforce.ai | still up |
| 2025-06-01 | Visibility and Controls for Browser Agents · contextfort.ai | still up |
| 2026-06-01 | YCFabraix The world's frontier hacker of AI agents. · fabraix.com | still up |
| 2023-01-01 | YCMatano Cloud Native SIEM (alternative to Splunk/Elastic) · matano.dev | still up |
| 2024-09-01 | The AI Security Engineer to Find and Fix Vulnerabilities · gecko.security | still up |
| 2025-09-01 | The sensitive data redaction layer for AI · logosguard.com | still up |
| 2026-01-01 | The control plane for AI agents. · agenticfabriq.com | still up |
| 2026-06-01 | YCPalisade AI that finds and fixes OS-level vulnerabilities across device fleets · palisade-ai.com | still up |
| 2024-01-01 | LLM Security and Compliance · promptarmor.com | 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.