You asked about Security
157 people built something like it. 21 are gone.
That is 16% of the ones whose fate we could settle, against 23% across the whole register. 25 were acquired.
| 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 |
| 2012-01-01 | YCAuthy Authy is a Two-Factor Authentication platform for developers · authy.com | acquired |
| 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 |
| 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 |
| 2018-01-01 | YCSqreen Sqreen is the application security platform for the modern enterprise · sqreen.com | acquired |
| 2018-01-01 | Security auditing for Web3 · quantstamp.com | still up |
| 2022-01-01 | Identity Verification API for Emerging Markets · prembly.com | still up |
| 2021-06-01 | YCRootly AI-native on-call and incident response carefully crafted to help… · rootly.com | still up |
| 2022-06-01 | YCOneleet YC's most popular security compliance platform (SOC 2, ISO 27001,… · oneleet.com | still up |
| 2020-06-01 | YCSafeBase Trust Center platform that scales customer security reviews · safebase.io | acquired |
| 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 |
| 2020-06-01 | YCNotabene The Notabene platform is the trust layer for global money movement. · notabene.id | still up |
| 2010-06-01 | YCAeroFS Secure Enterprise Collaboration. · aerofs.com | acquired |
| 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 |
| 2022-01-01 | YCMunily Access control management app for Latam´s gated communities · munily.com | still up |
| 2022-01-01 | YCCinder Infrastructure to protect companies from AI abuse · cinder.ai | 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 |
| 2024-01-01 | Autonomous offensive and defensive cybersecurity platform · codeant.ai | still up |
| 2019-01-01 | YCDoppler Secure secrets. Prevent breaches. Keep teams moving. · doppler.com | 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 |
| 2016-01-01 | YCCastle Block bots & bad behavior · castle.io | still up |
| 2020-06-01 | YCSwif.ai Manage every device. Govern every AI agent. · swif.ai | still up |
| 2024-06-01 | Automate security and privacy reviews · clearly-ai.com | still up |
| 2020-01-01 | YCDatree Datree prevents Kubernetes misconfigurations from reaching production · datree.io | gone |
| 2019-01-01 | YCMedCrypt MedCrypt gives medical device vendors cybersecurity features in a few… · medcrypt.co | still up |
| 2022-06-01 | Managing your Employees' Access to SaaS · accessowl.io | still up |
| 2025-01-01 | YCConntour AI to monitor thousands of security cameras. · conntour.com | 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 |
| 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 |
| 2014-01-01 | We're making a smart, front door camera with intercom that lets you… · getkuna.com | acquired |
| 2005-06-01 | clickfacts.com | acquired |
| 2015-01-01 | YCFinal A credit card that drastically reduces payment fraud and gives… · getfinal.com | acquired |
| 2015-01-01 | YCThinAir Intelligent data security for teams · thinair.com | gone |
| 2015-06-01 | Shifting the asymmetry of cyber security. · cymmetria.com | acquired |
| 2017-06-01 | Protecting applications from malicious activity · templarbit.com | acquired |
| 2015-01-01 | YCSmyte Smyte stops bad actors on social networks and marketplaces. · smyte.com | acquired |
| 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 |
| 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 |
| 2018-06-01 | Protecting your employees against online harassment · tallpoppy.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 |
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.