You asked about B2B
48 people built something like it. 48 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2023-01-01 | YCPeeba Risk-free wholesale for retailers across Southeast Asia · peeba.com | gone |
| 2023-05-28 | pageshidara.com | gone |
| 2023-06-01 | YCAtla The improvement engine for AI agents · atla-ai.com | gone |
| 2023-06-01 | YCMovley Your e-commerce brand's product quality control department. · movley.com | gone |
| 2023-01-01 | The TikTok style corporate training platform · goodcourse.co | gone |
| 2023-06-01 | Transform scientific data into discoveries · mantlebio.com | gone |
| 2023-06-01 | YCUnhaze The right leads at the right time for B2B sales · unhaze.ai | gone |
| 2023-01-01 | YCLuca The Modern Pricing Engine for Retail · askluca.com | gone |
| 2023-01-01 | Foundation Model for Human Attention · creatorml.com | gone |
| 2023-06-01 | The publishing layer for the agentic internet · structuredlabs.com | gone |
| 2023-01-01 | YCLynx AI platform for investigating and resolving engineering incidents · uselynx.ai | gone |
| 2023-01-01 | YCNeptyne The programmable spreadsheet. · neptyne.com | gone |
| 2023-06-01 | YCSynch Supercharging Sales · withsynch.com | gone |
| 2023-06-01 | Aide is an AI-native , privacy-first IDE built on top of VSCode · aide.dev | gone |
| 2023-01-01 | AI-native operating system for analytics teams · turntable.so | gone |
| 2023-06-01 | YCCraftOS Inventory Management and POS for the Wine industry · craftos.com | gone |
| 2023-06-01 | AI Overview Search, as a Service · branch-ai.com | gone |
| 2023-01-01 | YCSecond AI-Native Enterprise Codebase Maintenance · second.dev | gone |
| 2023-01-01 | YCEcho Founder-led sales co-pilot for B2B startups. · echothat.ai | gone |
| 2023-01-01 | AI-powered customer support automation for fast-growing companies · opensight.ai | gone |
| 2023-06-01 | YCSidenote Meeting follow-up, automated · sidenote.ai | gone |
| 2023-06-01 | Incentives and financing for energy efficiency upgrades · line.build | gone |
| 2023-01-01 | YCLayup Guide your users. Right in your product. · layuplabs.ai | gone |
| 2023-01-01 | YCStruct Multi-lingual AI Voice Agents · struct.app | gone |
| 2023-01-01 | AI-powered data extraction engine · indexical.dev | gone |
| 2023-01-01 | YCDefer Zero infrastructure background processing platform. · defer.run | gone |
| 2023-01-01 | YCrift B2B lead routing made simple · rift.com | gone |
| 2023-01-01 | YCBlyss End-to-end encrypted AI. · blyss.dev | gone |
| 2023-06-01 | YCVango AI Development platform that makes it 10x easier to improve visual models · vango.ai | gone |
| 2023-01-01 | YCSorted Instant SaaS management · sorted-lp.webflow.io | gone |
| 2023-01-01 | YCMogara Automatic software R&D capitalization · mogara.com | gone |
| 2023-01-01 | Helps Developers build stunning UI Lightning Fast ⚡️ · codeparrot.ai | gone |
| 2023-06-01 | YCLysto Revenue intelligence platforms for startups · lysto.ai | gone |
| 2023-06-01 | Affordable carbon tracking solution for all businesses · greentally.ai | gone |
| 2023-01-01 | YCFabius AI to improve Sales Calls · fabius.io | gone |
| 2023-01-01 | YCmoonrepo Open source build tool for monorepos and large codebases · moonrepo.dev | gone |
| 2023-01-01 | YCSerial Root cause manufacturing issues in seconds · serial.io | gone |
| 2023-01-01 | We are still in stealth mode. · tryinterlock.com | gone |
| 2023-06-01 | AI Energy Management · trycardinal.ai | gone |
| 2023-01-01 | The Gen AI evaluation and curation platform · magicflow.ai | gone |
| 2023-06-01 | YCBriefer The collaborative data platform. · briefer.cloud | gone |
| 2023-06-01 | YCVizly Data to insights in seconds · vizly.fyi | gone |
| 2023-01-01 | Create step by step articles with screenshots and videos 10x faster · gluetrail.com | gone |
| 2023-01-01 | demospace.ai | gone |
| 2023-01-01 | AI Powered Product Discovery · rubberduckylabs.io | gone |
| 2023-01-01 | AI assistant for customer support · growparabolic.com | gone |
| 2023-01-01 | YCCakework API that adds cloud hosting to any developer platform · cakework.com | gone |
| 2023-01-01 | Resolve PR check failures instantly with AI · technician.dev | gone |
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.