You asked about Small Modular Reactors
62 people built something like it. 11 are gone.
That is 20% of the ones whose fate we could settle, against 23% across the whole register. 8 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2014-06-01 | YCOklo Emission free, always on power from advanced fission power plants. · oklo.com | acquired |
| 2019-01-01 | We produce cancer-curing materials used in nuclear medicine. · atomicalchemy.us | acquired |
| 2015-06-01 | The 401(k) for small and medium-sized businesses. · humaninterest.com | still up |
| 2013-01-01 | YCZenefits HR for small businesses: onboarding, payroll and benefits. · zenefits.com | acquired |
| 2023-01-05 | clickhouse.com | still up |
| 2022-07-06 | plezi.co | unverified |
| 2022-01-13 | plumhq.com | still up |
| 2022-05-15 | awesomeindie.com | still up |
| 2022-05-01 | noisecraft.app | still up |
| 2022-01-17 | css-speedrun.netlify.app | still up |
| 2011-01-01 | Customer loyalty and payments platform for small businesses. · fivestars.com | acquired |
| 2022-06-10 | tabbed.org | unverified |
| 2022-06-01 | akaunting.com | still up |
| 2013-01-01 | Empowering restaurants and small food makers to ship nationwide. · goldbelly.com | still up |
| 2022-01-26 | dealflow.microacquisitions.com | moved |
| 2021-04-07 | skruv.io | still up |
| 2020-06-01 | YCZuddl Zuddl is a modular platform for events and webinars that helps event… · zuddl.com | still up |
| 2019-06-01 | Helping create a smaller, fairer, safer justice system · recidiviz.org | still up |
| 2022-04-15 | hypercardsimulator.com | moved |
| 2011-01-01 | eSignature software for small and mid-market businesses. · hellosign.com | acquired |
| 2026-08-26 | pantsforbirds.com | unverified |
| 2021-06-01 | auxl.io | still up |
| 2022-02-22 | constructor.dev | unverified |
| 2021-06-01 | YCNomod The UAE’s leading small business payments platform · nomod.com | still up |
| 2019-06-01 | YCZippi Payment Platform for LatAm Micro and Small Businesses · zippi.com.br | still up |
| 2021-08-31 | docs.beryl.dev | gone |
| 2022-02-02 | patcher.xyz | still up |
| 2022-01-01 | YCTransfez Brex for small businesses in Indonesia · itsjack.com | still up |
| 2022-03-25 | verygoodtable.com | gone |
| 2013-01-01 | We sell health insurance to small businesses 100% online. · simplyinsured.com | still up |
| 2021-01-01 | YCNextPay The digital bank for small businesses in the Philippines. · nextpay.world | still up |
| 2016-01-01 | YCBonsai The all-in-one solution for small businesses and self-employed. · hellobonsai.com | acquired |
| 2019-06-01 | YCLokal Local news, information and classifieds for India's small town users · getlokalapp.com | still up |
| 2021-06-01 | YCODWEN AirBnB for Small Warehouses · odwen.co.in | still up |
| 2022-01-01 | Group Financing for small businesses across Africa. · userank.com | still up |
| 2021-05-18 | smol.pub | still up |
| 2021-01-01 | The payments solution for small scale construction. · go.build | gone |
| 2021-01-01 | YCGimBooks GimBooks makes Bookkeeping Easy for small business owners · gimbooks.com | still up |
| 2024-01-01 | YCOffDeal AI-native investment bank for small businesses · offdeal.io | still up |
| 2021-07-16 | stopping.app | gone |
| 2021-09-08 | nanojob.com | unverified |
| 2015-01-01 | YCSeed Mobile banking for small business. · seed.co | acquired |
| 2012-06-01 | Canopy Labs automates customer analytics for small and medium-sized… · canopylabs.com | gone |
| 2015-06-01 | Worlds smallest and friendliest café franchise. "The Bike-Powered… · wheelyscafe.com | gone |
| 2014-06-01 | PersistIQ is a free email automation platform to send a small batch… · persistiq.com | acquired |
| 2022-01-01 | Next-generation, modular electric vehicles · olympianmotors.com | still up |
| 2021-02-24 | prophecy.io | moved |
| 2020-06-01 | A small sticker that monitors blood pressure continuously · venavitals.com | still up |
| 2021-09-01 | constructor.dev | unverified |
| 2026-09-01 | tinyjs.app | unverified |
| 2022-06-01 | YCDelegasi Automated accounting service for small businesses in Indonesia · delegasi.co | gone |
| 2025-09-01 | The Modular Interceptor Platform · wardstone.us | still up |
| 2026-01-01 | Modular AI-Commanded Drones for Defence · seeing-systems.com | still up |
| 2021-08-19 | surplusci.com | unverified |
| 2026-06-01 | Drone swarm defence at a small-unit level · earendil.io | still up |
| 2018-01-01 | Vena Medical is providing physicians with the world's smallest camera… · venamed.ca | still up |
| 2022-05-10 | csvbase.com | still up |
| 2025-01-01 | Fusion reactors for ships · maritimefusion.com | still up |
| 2022-02-03 | fontite.antonok.com | still up |
| 2022-05-07 | askdeeply.com | still up |
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.