You asked about SaaS
42 people built something like it. 6 are gone.
That is 16% 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 | YCTractian Physical AI for asset-heavy industries · tractian.com | still up |
| 2021-01-01 | YCCyble Cyble - World’s First Intelligence-Driven, AI-Native Security… · cyble.com | still up |
| 2021-01-01 | YCAbacum The AI-native FP&A platform that helps Finance teams drive business… · abacum.ai | still up |
| 2021-01-01 | YCFathom The most flexible AI meeting notetaker ever built. · fathom.ai | still up |
| 2021-06-01 | YCRootly AI-native on-call and incident response carefully crafted to help… · rootly.com | still up |
| 2021-06-01 | YCConfido AI-enabled financial automation and intelligence for CPG Brands · confidotech.com | still up |
| 2021-06-01 | YCVerihubs AI-powered Deepfake Detection · verihubs.com | still up |
| 2021-06-01 | YCSwipe Super AI Accountant for SMBs · getswipe.in | still up |
| 2021-01-01 | YCPopl Your AI GTM platform for In-Person Events · popl.co | still up |
| 2021-01-01 | YCSoraban AI tax workflow platform for accounting firms · soraban.com | still up |
| 2021-06-01 | YCSully.ai Autonomous team of AI agents that runs the entire hospital operations · sully.ai | still up |
| 2021-01-01 | YCHumaans AI-Powered HRIS for high performing teams · humaans.io | still up |
| 2021-06-01 | YCLago The AI Native Billing Platform · getlago.com | still up |
| 2021-06-01 | Track & Boost Your Brand’s Visibility in AI Search · writesonic.com | still up |
| 2021-01-01 | AI-powered customer service for startups · cloudhumans.com | still up |
| 2021-01-01 | Generative AI powered Shopify for home service professionals · toplinepro.com | still up |
| 2021-06-01 | YCSecoda Secoda is the AI layer for your Analytics · secoda.co | still up |
| 2021-06-01 | AI Agents for Data Operations · oneschema.co | still up |
| 2021-06-01 | YCAbstra Automate finance operations with Python and AI · abstra.io | still up |
| 2021-06-01 | Security Delivery Platform to orchestrate AI agents for Service… · contraforce.com | still up |
| 2021-06-01 | YCEpsilon3 AI-Powered ERP, MES, and Test Software for Complex Operations · epsilon3.io | still up |
| 2021-06-01 | YCDailybot Make all team work visible — people and AI agents · dailybot.com | still up |
| 2021-06-01 | YCVaros AI Business Analysts to gather requirements and optimize processes · varos.com | still up |
| 2021-06-01 | Never code alone. · squire.ai | gone |
| 2021-01-01 | YCAxiom.ai No-code Browser RPA · axiom.ai | still up |
| 2021-01-01 | YCBiodock Cloud AI microscopy automation · biodock.ai | still up |
| 2021-06-01 | YCGetDot Your AI Data Analyst · getdot.ai | still up |
| 2021-06-01 | YCStardex AI native ATS + CRM for executive search firms · stardex.com | still up |
| 2021-06-01 | YCRivia.AI Interactive Product Demos · rivia.ai | still up |
| 2021-06-01 | Mobile app for CPG brands to connect to millions of stores globally · milkyway.ai | gone |
| 2021-06-01 | The complete production quality platform. AI-powered E2E testing,… · artillery.io | still up |
| 2021-06-01 | AI-powered equity research software · hudson-labs.com | still up |
| 2021-06-01 | Building Gong.io for offline retail. · outloud.ai | gone |
| 2021-01-01 | AI Assistant for Customer Support · firstsupport.ai | still up |
| 2021-01-01 | YCFriz AI Social Media Manager · usefriz.com | acquired |
| 2021-06-01 | YCVogent Build Voice AI Agents · vogent.ai | acquired |
| 2021-01-01 | YCCodeball AI-Powered Code Review · codeball.ai | gone |
| 2021-06-01 | YCBytebot Bytebot is the open source container for AI desktop agents. · bytebot.ai | acquired |
| 2021-06-01 | Build factory ready tech packs in minutes. · aitechpacks.com | still up |
| 2021-06-01 | YCMentum AI-Powered Assistant for Procurement and Strategic Sourcing · getmentum.com | acquired |
| 2021-06-01 | Sales AI that helps revenue teams move faster and close more deals. · firstquadrant.ai | gone |
| 2021-06-01 | YCOpkit AI phone calls for the US healthcare industry · opkit.co | 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.