You asked about B2B
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2007-06-01 | YCDropbox Backup and share files in the cloud. · dropbox.com | acquired |
| 2015-01-01 | YCGitLab A complete DevOps platform delivered as a single application. · gitlab.com | acquired |
| 2010-01-01 | The first all-in-one operating system for marketing · optimizely.com | acquired |
| 2016-06-01 | YCMeesho Democratizing internet commerce for everyone in India · meesho.com | acquired |
| 2010-06-01 | Real-time visibility into critical apps and services all in one place. · pagerduty.com | acquired |
| 2012-01-01 | Digital Analytics Platform · amplitude.com | acquired |
| 2014-01-01 | YCWeave Customer communication and payments platform. · getweave.com | acquired |
| 2011-06-01 | YCSegment Software and APIs to collect, clean, and control customer data. · segment.com | acquired |
| 2013-01-01 | YCZenefits HR for small businesses: onboarding, payroll and benefits. · zenefits.com | acquired |
| 2011-06-01 | YCFirebase Build and grow iOS, Android, and Web apps. · firebase.com | acquired |
| 2013-01-01 | YCHeap Captures user interactions with no code to generate analytics. · heap.io | acquired |
| 2014-01-01 | YCUnbabel AI-powered Language Operations platform · unbabel.com | acquired |
| 2008-01-01 | YCHeroku Enabling developers to build and run applications in the cloud. · heroku.com | acquired |
| 2012-06-01 | YCLever Talent Acquisition Suite that combines ATS + Talent CRM · lever.co | acquired |
| 2011-01-01 | Customer loyalty and payments platform for small businesses. · fivestars.com | acquired |
| 2016-06-01 | YCgarten Creating workplace wellbeing. · garten.co | acquired |
| 2007-01-01 | YCWeebly Build a free website that grows with your business. · weebly.com | acquired |
| 2012-01-01 | YCAuthy Authy is a Two-Factor Authentication platform for developers · authy.com | acquired |
| 2015-06-01 | PartnerStack is a full stack solution for partnerships. · partnerstack.com | acquired |
| 2010-06-01 | YCPresto Digital meets physical for big chain restaurants · presto.com | acquired |
| 2022-01-01 | YCRider Modern parcel delivery for online sellers in Pakistan. · withrider.com | acquired |
| 2013-06-01 | YCCoreOS Open source tools of modern distributed systems. · coreos.com | acquired |
| 2017-01-01 | YCUpKeep Mobile-first software for maintenance teams. · upkeep.com | acquired |
| 2017-01-01 | YCHumi Payroll, HR, and Health Benefits for Canada's SMB's · humi.ca | acquired |
| 2018-01-01 | YCSqreen Sqreen is the application security platform for the modern enterprise · sqreen.com | acquired |
| 2016-01-01 | YCGitPrime Visibility and analytics for software development leaders. · gitprime.com | acquired |
| 2019-01-01 | YCConvex Software for the commercial services industry. · convex.com | acquired |
| 2016-06-01 | YCWorkRamp The All-in-One Learning Platform · workramp.com | acquired |
| 2019-06-01 | YCLocalyze Global mobility platform for companies and employees · localyze.com | acquired |
| 2015-06-01 | YCBluecrew Bluecrew is a web based staffing agency. · bluecrewjobs.com | acquired |
| 2013-06-01 | YCArcus Payment-as-a-service that helps any business launch payment solutions · arcusfi.com | acquired |
| 2019-01-01 | Higher Ed's Best Friend - integrated academic operations software. · coursedog.com | acquired |
| 2011-01-01 | eSignature software for small and mid-market businesses. · hellosign.com | acquired |
| 2021-01-01 | YCR2 Embedded lending infrastructure · r2.co | acquired |
| 2015-01-01 | YCBonfire Bonfire is reimagining RFPs & bidding for gov procurement teams · gobonfire.com | acquired |
| 2017-01-01 | YCArmory Continuous Deployment at any scale, for all developers. · armory.io | acquired |
| 2019-01-01 | YCMemfault First IoT reliability platform for debugging, monitoring, OTA updates · memfault.com | acquired |
| 2013-01-01 | YCBitnami The App Store for Server Software · bitnami.com | acquired |
| 2008-01-01 | We build communities through massively multiplayer mobile games · athinkingape.com | acquired |
| 2019-01-01 | YCHatch The AI CSR Platform · usehatch.ai | acquired |
| 2018-01-01 | The people, management, and culture operating system for your startup. · qulture.rocks | acquired |
| 2020-06-01 | YCSkio Subscriptions for Shopify · skio.com | acquired |
| 2015-06-01 | Intelligent technical hiring. · triplebyte.com | acquired |
| 2021-06-01 | YCMailmodo No-code email marketing platform to send forms & widgets within emails · mailmodo.com | acquired |
| 2014-01-01 | Rocketrip helps companies save money on travel expenses by aligning… · rocketrip.com | acquired |
| 2015-01-01 | YCLumi Packaging for online brands. · lumi.com | acquired |
| 2019-01-01 | YCForage Online job simulations for companies to train, and then hire, students · theforage.com | acquired |
| 2023-01-01 | YCStackAI The Enterprise AI Transformation Platform · stackai.com | acquired |
| 2015-06-01 | Unlock the power of transaction data. · secondmeasure.com | acquired |
| 2019-06-01 | YCEmbrace Modern user-focused observability built on OpenTelemetry · embrace.io | acquired |
| 2013-06-01 | Legal Operations for corporate legal teams. · simplelegal.com | acquired |
| 2018-06-01 | YCRegology AI Agents for Regulatory Compliance · regology.com | acquired |
| 2020-06-01 | YCWarmly, [Acquired by HubSpot in 2026] Autonomous sales platform to auto-email… · warmly.ai | acquired |
| 2015-01-01 | Data Versioning, Data Pipelines, and Data Lineage · pachyderm.com | acquired |
| 2014-06-01 | The system of record for government affairs. · govpredict.com | acquired |
| 2020-06-01 | YCSafeBase Trust Center platform that scales customer security reviews · safebase.io | acquired |
| 2014-01-01 | YCDevCycle Feature Flag Management Built for Developers · devcycle.com | acquired |
| 2022-01-01 | YCSkyLink Travel Management Meets AI · tryskylink.com | acquired |
| 2011-01-01 | iOS porting · apportable.com | acquired |
| 2008-06-01 | YCCloudant NoSQL Database-aaS. Acquired by IBM in 2014. Now IBM Cloud Data… · cloudant.com | acquired |
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.