You asked about Hard Tech
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2020-06-01 | YCQuell Get fit fighting your way through a fantasy world. · playquell.com | acquired |
| 2020-01-01 | YCTeleo Supervised Autonomous Heavy Equipment · teleo.ai | acquired |
| 2016-06-01 | YCProxy Smart ring digital wallet · proxy.com | acquired |
| 2015-06-01 | YCNebia Nebia is a breakthrough shower system, based on a premium experience,… · nebia.com | acquired |
| 2018-06-01 | We build artificial intelligence processors inspired by the brain. · rain-neuromorphics.com | acquired |
| 2019-01-01 | We produce cancer-curing materials used in nuclear medicine. · atomicalchemy.us | acquired |
| 2019-06-01 | Using cooling to end brain damage during stroke. · voyage.bio | acquired |
| 2021-01-01 | Building robots to automate commercial concrete construction. · rointech.com | acquired |
| 2012-06-01 | YCCoinbase Buy, sell, and manage cryptocurrencies. · coinbase.com | acquired |
| 2018-01-01 | YCGroww Making financial services simple, transparent and delightful. · groww.in | acquired |
| 2017-01-01 | YCBrex Business accounts, corporate cards, and spend management software. · brex.com | acquired |
| 2019-01-01 | YCKovi Making car ownership more inclusive, flexible and simple. · kovi.com.br | acquired |
| 2018-01-01 | YCNewfront Modern insurance brokerage. · newfront.com | acquired |
| 2013-01-01 | YCZenefits HR for small businesses: onboarding, payroll and benefits. · zenefits.com | acquired |
| 2009-06-01 | YCWePay Payments for platform businesses. · wepay.com | acquired |
| 2012-01-01 | YCSendwave Instant, no fee international remittances. · sendwave.com | acquired |
| 2011-06-01 | The leading online learning platform for technical skills. · codecademy.com | acquired |
| 2016-01-01 | YCTruebill Live your best financial life · truebill.com | acquired |
| 2012-06-01 | YCClever The platform that powers technology in the classroom. · clever.com | acquired |
| 2011-01-01 | Customer loyalty and payments platform for small businesses. · fivestars.com | acquired |
| 2011-06-01 | YCZeus Tech-enabled property manager focused on corporate rentals; Acquired… · zeusliving.com | acquired |
| 2010-06-01 | YCPresto Digital meets physical for big chain restaurants · presto.com | acquired |
| 2014-01-01 | YCAxoni Axoni is building the next generation of capital markets technology · axoni.com | acquired |
| 2017-01-01 | YCHumi Payroll, HR, and Health Benefits for Canada's SMB's · humi.ca | acquired |
| 2018-01-01 | Digitize and Automate Complex Care Workflows · memorahealth.com | acquired |
| 2016-01-01 | YCPaystack Modern payments infrastructure for Africa · paystack.com | acquired |
| 2019-01-01 | YCConvex Software for the commercial services industry. · convex.com | acquired |
| 2015-06-01 | Values based personalization at scale for asset and wealth management · openinvest.com | acquired |
| 2013-06-01 | YCArcus Payment-as-a-service that helps any business launch payment solutions · arcusfi.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 |
| 2017-06-01 | Health enterprise API for data on doctors, insurance, costs, & quality · ribbonhealth.com | acquired |
| 2018-01-01 | Better health insurance for mid-size companies · evryhealth.com | acquired |
| 2019-01-01 | BoardRE is a new type of mortgage company that upgrades any offer… · accept.inc | acquired |
| 2015-06-01 | Intelligent technical hiring. · triplebyte.com | acquired |
| 2020-06-01 | YCSkio Subscriptions for Shopify · skio.com | acquired |
| 2015-01-01 | Tech in Asia (YC W15) is the largest English-language technology… · techinasia.com | acquired |
| 2014-01-01 | Rocketrip helps companies save money on travel expenses by aligning… · rocketrip.com | acquired |
| 2015-01-01 | YCVest Bringing wider access to financial derivatives. · vestfin.com | acquired |
| 2015-06-01 | Unlock the power of transaction data. · secondmeasure.com | acquired |
| 2014-06-01 | The system of record for government affairs. · govpredict.com | acquired |
| 2018-06-01 | YCRegology AI Agents for Regulatory Compliance · regology.com | acquired |
| 2014-06-01 | We make bitcoin simple. · bitaccess.com | acquired |
| 2015-06-01 | YCXfers Xfers makes it possible for people to make and receive payments via… · xfers.com | acquired |
| 2019-06-01 | YCCompound Compound is a wealth manager for people who work at tech companies. · withcompound.com | acquired |
| 2013-01-01 | YCNorth Wearable computing hardware: biosignal gesture recognition · bynorth.com | acquired |
| 2012-01-01 | YCTilt Mobile crowdfunding: The easiest way to collect, fundraise, and sell… · tilt.com | acquired |
| 2012-01-01 | YCFond Rewards and recognition SaaS for HR leaders · fond.co | acquired |
| 2012-06-01 | YCSoylent Soylent is a simple, nutritious, and affordable food that possesses… · soylent.com | acquired |
| 2010-06-01 | The online financial management service for everyone. · futureadvisor.com | acquired |
| 2011-06-01 | YCCaviar Uber for food. · trycaviar.com | acquired |
| 2020-01-01 | YCAble India's Largest Placement Platform for Early Professionals · ablejobs.co | acquired |
| 2012-06-01 | Acquired by Carlyle. Edtech and other technology · studyedge.com | acquired |
| 2019-06-01 | YCCuboh We help restaurants manage their online orders. · cuboh.com | acquired |
| 2011-06-01 | Powering scientific outsourcing · scienceexchange.com | acquired |
| 2021-01-01 | YCVerak Better Business Insurance for MSMEs in India · verak.in | acquired |
| 2015-01-01 | YCHigherMe Helping restaurant employers find & hire better employees faster · higherme.com | acquired |
| 2015-06-01 | YCEden Workplace software for people-centric companies. · edenworkplace.com | acquired |
| 2020-01-01 | YCCheckars E-commerce site where you can buy certified used-cars in Latin America · checkars.com | acquired |
| 2015-01-01 | Next generation infectious disease test kits · lucirahealth.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.