You asked about Quantum Computing
68 people built something like it. 14 are gone.
That is 23% 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 | Quantum coherent supercomputing. · rigetti.com | acquired |
| 2024-06-01 | AI that operates quantum computers for scientific discovery · conductorquantum.com | still up |
| 2020-01-01 | Menten AI designs peptide and protein therapeutics using quantum… · menten.ai | still up |
| 2019-01-01 | YCAuroraQ Building the first practical, integrated quantum computer. · auroraq.com | gone |
| 2009-06-01 | YCMixpanel Mixpanel is event analytics for builders that need answers. · mixpanel.com | still up |
| 2012-01-01 | YCRescale High Performance Computing Built for the Cloud · rescale.com | still up |
| 2021-11-23 | unsafeperform.io | still up |
| 2023-02-23 | codeberg.org | still up |
| 2013-01-01 | YCNorth Wearable computing hardware: biosignal gesture recognition · bynorth.com | acquired |
| 2023-12-28 | forwardemail.net | still up |
| 2014-06-01 | YCAptible The No Infrastructure Platform as a Service · aptible.com | acquired |
| 2025-06-01 | YCKERNEL Crazy fast, open source infra for AI agents to use the Internet · kernel.sh | still up |
| 2020-06-01 | YCPorter Easiest way to deploy on AWS/GCP/Azure · porter.run | still up |
| 2023-01-01 | Transform any software to multi-cloud SaaS in minutes not years · omnistrate.com | still up |
| 2024-01-01 | YCUbicloud Open source alternative to AWS · ubicloud.com | still up |
| 2022-10-04 | capeprivacy.com | moved |
| 2022-06-01 | A scalable, cloud-native Perforce and Git alternative · diversion.dev | still up |
| 2024-06-01 | Data centers in space · starcloud.com | still up |
| 2019-06-01 | YCWasmer The Operating System for Edge Computing · wasmer.io | still up |
| 2016-06-01 | YCSixa Personal computer in the cloud · sixa.io | gone |
| 2019-06-01 | The Fastest Scientific Computing Platform on the Planet · vorticity.xyz | still up |
| 2024-06-01 | VMware for GPUs · thundercompute.com | still up |
| 2022-01-01 | Visually design and manage cloud infrastructures. · brainboard.co | still up |
| 2022-01-01 | 10x-1000x faster compute for Neural Network training · strongcompute.com | still up |
| 2021-06-01 | Eliminate Cloud Waste. Attribute and Track Savings. Engage Engineers. · cloudthread.io | acquired |
| 2022-01-01 | Accelerate verifiable computing · argument.xyz | still up |
| 2025-06-01 | YCLuminal Making AI run fast on any hardware. · luminal.com | still up |
| 2021-07-24 | bazinga.so | gone |
| 2021-04-09 | quantumflytrap.com | still up |
| 2021-01-01 | World's fastest and most optimal route optimization engine · logisticsos.com | still up |
| 2022-06-01 | No-code data curation for LLM fine-tuning and evaluation. · airtrain.ai | gone |
| 2026-06-01 | YCCaution Hosting platform for software you can't afford to have hacked · caution.co | still up |
| 2024-06-01 | The most powerful sandboxes for AI Agents · freestyle.sh | still up |
| 2022-05-23 | hulse.app | gone |
| 2022-01-01 | Run compute-intensive apps in a browser · jamsocket.com | acquired |
| 2022-01-01 | YCBeam AI-Native Cloud Platform · beam.cloud | still up |
| 2023-06-01 | YCCedana Fast, reliable, reproducible AI with GPU live migration · cedana.ai | still up |
| 2015-01-01 | Full-service web, mobile, & cloud studio providing professional… · sailsjs.com | still up |
| 2024-06-01 | We build and operate underwater data centers. · networkocean.io | still up |
| 2025-06-01 | YCLilac We sell GPUs. · getlilac.com | still up |
| 2022-01-01 | YCRavion The agent-native cloud infrastructure platform for AWS. · ravion.com | still up |
| 2026-09-01 | YCAscii The best cloud VMs for billions of agents · box.ascii.dev | still up |
| 2025-01-01 | YCArchon We help software companies sell to government. · archon.inc | still up |
| 2023-01-01 | AI Agent for Cloud Infrastructure · infra.new | still up |
| 2026-09-01 | YCMaritime The managed cloud for AI agents. · maritime.sh | still up |
| 2024-06-01 | YCRewbi A stealth mode startup. · rewbi.com | still up |
| 2017-01-01 | YCFastJVM Making the JVM faster · fastjvm.com | still up |
| 2024-06-01 | YCHyrex The COLD Task Framework · hyrex.io | still up |
| 2025-01-01 | Vercel For GPUs · tensorpool.dev | acquired |
| 2021-01-01 | YCTriplit The best database for app developers · triplit.dev | gone |
| 2012-06-01 | YCGoScale Dynamical Scaling Virtual Machines as a Service · goscale.com | gone |
| 2017-01-01 | YCTerark Fastest Storage Engine with the Best Compression, we enables direct… · terark.com | acquired |
| 2019-06-01 | YCTensil We turn machine learning models into custom hardware. · tensil.ai | gone |
| 2023-01-01 | YCCakework API that adds cloud hosting to any developer platform · cakework.com | gone |
| 2026-06-01 | We make silicon on the Moon, to power everything in space. · ethos-space.com | still up |
| 2026-06-01 | Derivatives Exchange for Compute · getcomputable.com | still up |
| 2026-06-01 | New semiconductors that merge compute and vision · synapsesemi.org | still up |
| 2026-06-01 | YCHoplite Effortlessly deploy cloud software factories. · hoplite.sh | still up |
| 2024-06-01 | Software and hardware to run neural networks faster and cheaper · deepsilicon.net | gone |
| 2023-01-01 | YCBuildJet High-performance computing cloud · buildjet.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.