You asked about Security
124 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 |
|---|---|---|
| 2018-01-01 | YCVanta Vanta—the proven leader in automated compliance helping startups… · vanta.com | still up |
| 2019-06-01 | YCTRM Labs TRM is building a safer world for billions of people. · trmlabs.com | still up |
| 2015-06-01 | YCTeleport The Infrastructure Identity Company · goteleport.com | still up |
| 2022-10-05 | beaglesecurity.com | still up |
| 2016-01-01 | Protects organizations from getting breached through their APIs. · salt.security | still up |
| 2021-01-01 | YCCyble Cyble - World’s First Intelligence-Driven, AI-Native Security… · cyble.com | still up |
| 2021-11-29 | jvsg.com | still up |
| 2020-01-01 | YCRiot Cybersecurity awareness for fast growing companies · tryriot.com | still up |
| 2017-01-01 | AI company transforming enterprise physical security to prevent… · ambient.ai | still up |
| 2012-06-01 | Secure Collaboration for Technical Teams · mattermost.com | still up |
| 2022-06-27 | cloud.armosec.io | still up |
| 2018-01-01 | Security auditing for Web3 · quantstamp.com | still up |
| 2022-01-01 | Identity Verification API for Emerging Markets · prembly.com | still up |
| 2022-06-01 | YCOneleet YC's most popular security compliance platform (SOC 2, ISO 27001,… · oneleet.com | still up |
| 2021-06-01 | YCRootly AI-native on-call and incident response carefully crafted to help… · rootly.com | still up |
| 2022-03-02 | argos-security.io | still up |
| 2018-01-01 | YCAnjuna Anjuna enabled organizations to trust any infrastructure · anjuna.io | still up |
| 2022-01-01 | YCOptery Opt out software that removes your private info from the internet · optery.com | still up |
| 2022-01-01 | Enterprise Deepfake Detection · realitydefender.com | still up |
| 2022-01-01 | YCAgency Agency replaces traditional security and compliance headcount with AI. · getagency.com | still up |
| 2023-01-01 | Unified platform for secrets, certs, and privileged access management · infisical.com | still up |
| 2021-12-14 | impervious.com | still up |
| 2020-06-01 | YCNotabene The Notabene platform is the trust layer for global money movement. · notabene.id | still up |
| 2017-06-01 | YCUpfort Turnkey security & hassle-free cyber insurance from leading insurers · upfort.com | still up |
| 2019-01-01 | YCTermius Termius is an SSH client with team collaboration features · termius.com | still up |
| 2021-01-01 | YCauthzed Authorization Infrastructure securing AI at OpenAI, Zoom, & more · authzed.com | still up |
| 2023-05-05 | dys2p.com | still up |
| 2022-01-01 | YCCinder Infrastructure to protect companies from AI abuse · cinder.ai | still up |
| 2022-01-01 | YCMunily Access control management app for Latam´s gated communities · munily.com | still up |
| 2023-01-01 | YCEscape Offensive security for the teams that are 100x outnumbered · escape.tech | still up |
| 2017-06-01 | YCD-ID Enable creators and developers to generate realistic AI personas · d-id.com | still up |
| 2019-01-01 | YCDoppler Secure secrets. Prevent breaches. Keep teams moving. · doppler.com | still up |
| 2024-01-01 | Autonomous offensive and defensive cybersecurity platform · codeant.ai | still up |
| 2021-01-01 | AI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws · feroot.com | still up |
| 2019-06-01 | YCCanix Canix makes it easy to get and stay compliant as a cannabis business. · canix.com | still up |
| 2023-10-18 | kerkour.com | still up |
| 2020-06-01 | YCSwif.ai Manage every device. Govern every AI agent. · swif.ai | still up |
| 2016-01-01 | YCCastle Block bots & bad behavior · castle.io | still up |
| 2024-06-01 | Automate security and privacy reviews · clearly-ai.com | still up |
| 2023-01-17 | caido.io | still up |
| 2019-01-01 | YCMedCrypt MedCrypt gives medical device vendors cybersecurity features in a few… · medcrypt.co | still up |
| 2025-01-01 | YCConntour AI to monitor thousands of security cameras. · conntour.com | still up |
| 2022-06-01 | Managing your Employees' Access to SaaS · accessowl.io | still up |
| 2021-06-01 | Security Delivery Platform to orchestrate AI agents for Service… · contraforce.com | still up |
| 2024-06-01 | Drone detection for US defense and national security · guardianrf.com | 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 |
| 2023-01-01 | YCVariance AI Agents for Fraud Review and Investigations · variance.com | still up |
| 2023-11-14 | zerotrustassess.com | still up |
| 2020-01-01 | YCSkypher AI agent for Compliance Questionnaires Automation · skypher.co | still up |
| 2026-01-01 | Security builds trust. Strengthen both, all on one platform. · parameter.ai | still up |
| 2024-06-01 | YCZeroPath Automatically find and fix your software vulnerabilities · zeropath.com | still up |
| 2018-06-01 | Protecting your employees against online harassment · tallpoppy.com | still up |
| 2019-06-01 | YCTraces Transform your video monitoring with AI · traces.ai | still up |
| 2020-06-01 | Open source alternative to Auth0 / AWS Cognito / Firebase Auth · supertokens.com | still up |
| 2020-06-01 | YCFormal Take control of your data in real-time. · joinformal.com | still up |
| 2025-09-01 | YCComplyDo Global Compliance for Enterprises · complydo.io | still up |
| 2021-06-01 | AI-driven mobile cybersecurity · mallocprivacy.com | still up |
| 2021-06-01 | YCidemeum AI-powered Application Control · idemeum.com | still up |
| 2025-01-01 | Autonomous patrol-boats for National Security · splash9.com | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
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.