You asked about Neurotechnology
18 people built something like it. 3 are gone.
That is 19% of the ones whose fate we could settle, against 23% across the whole register. 2 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-01 | Using AI to help dementia patients age at home · craniometrix.com | still up |
| 2017-01-01 | Neural interfaces to understand and use nerve data in medicine. · bios.health | still up |
| 2022-01-01 | Bringing non-invasive brain stimulation from the hospital to the home · actipulseneuroscience.com | still up |
| 2019-01-01 | YCBrainKey Brain Longevity · brainkey.ai | still up |
| 2018-06-01 | We build artificial intelligence processors inspired by the brain. · rain-neuromorphics.com | acquired |
| 2024-01-01 | Foundation Model for the Brain · piramidal.ai | still up |
| 2021-01-01 | Thought-to-Language AI Models · mindportal.com | gone |
| 2025-01-01 | AI drug discovery platform for neurotherapeutics · exintherapeutics.com | still up |
| 2021-06-01 | Programmable biology company for psychoactive effect design · mindstate.design | still up |
| 2018-06-01 | Utilizing monogenic disorders to inform and solve highly complex… · circumventpharmaceuticals.com | still up |
| 2018-01-01 | YCNectome Human whole body end-of-life preservation for later revival. · nectome.com | still up |
| 2022-01-01 | High-precision, closed-loop neuromodulation devices · torpedotherapeutics.com | still up |
| 2019-06-01 | The neural engine for autonomous robots · wellprincipled.com | still up |
| 2019-06-01 | Using cooling to end brain damage during stroke. · voyage.bio | acquired |
| 2021-01-01 | YCAuricle Neurostimulation implant to restore hearing & speech understanding · auricle.com | still up |
| 2013-01-01 | Predicting workplace performance through neuroscience · prophecysciences.com | gone |
| 2026-06-01 | YCParasma Replacing GPUs with human brain cells · parasma.com | still up |
| 2014-06-01 | Brain health and awareness · springwit.com | gone |
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.