You asked about Batteryless IoT Sensors
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2020-01-01 | YCPowerX AI powered sensors that save energy, water and emissions · powerx.co | acquired |
| 2014-06-01 | YCTule Help farmers make irrigation decisions with sensors / computer vision · tuletechnologies.com | acquired |
| 2015-01-01 | YCChariot The world's first private mass transit service providing a commuting… · chariot.com | acquired |
| 2016-06-01 | YCgarten Creating workplace wellbeing. · garten.co | acquired |
| 2017-01-01 | YCUpKeep Mobile-first software for maintenance teams. · upkeep.com | acquired |
| 2019-01-01 | YCMemfault First IoT reliability platform for debugging, monitoring, OTA updates · memfault.com | acquired |
| 2011-06-01 | Automatic connects your car to the rest of your digital life. · automatic.com | acquired |
| 2015-01-01 | Bluesmart makes smart luggage powered by an app to empower people to… · bluesmart.com | acquired |
| 2011-06-01 | Powering scientific outsourcing · scienceexchange.com | acquired |
| 2015-01-01 | Personalized drug discovery for blood cancer. · notablelabs.com | acquired |
| 2014-06-01 | YCRavti Software to track, manage, and procure HVAC for commercial real… · ravti.com | acquired |
| 2014-06-01 | Data platform for metagenomics and the microbiome. · onecodex.com | acquired |
| 2018-06-01 | Virtual Lab Managers for scientists and biotech, research Labs · happilabs.org | acquired |
| 2015-01-01 | YCVanhawks We are making the smart carbon fibre commuting bike and platform for… · vanhawks.com | acquired |
| 2014-01-01 | We're making a smart, front door camera with intercom that lets you… · getkuna.com | acquired |
| 2016-06-01 | YCTechmate A technology concierge for your home. We provide on-demand support… · techmate.com | acquired |
| 2009-06-01 | Lockitron makes electronic locks you can control locally from your… · lockitron.com | acquired |
| 2022-01-01 | Potent, durable, and redosable non-viral genetic medicines · engagebio.com | acquired |
| 2018-06-01 | New therapeutics to rejuvenate tissue and treat age-related diseases · doriantherapeutics.com | acquired |
| 2016-01-01 | Novel long-read DNA sequencing technology · loopgenomics.com | acquired |
| 2022-01-01 | YCHypaHub A Cloud-Based Bioinformatics and AI Platform · hypahub.com | acquired |
| 2020-01-01 | Volumetric builds living multicellular tissues with a focus on the… · volumetricbio.com | acquired |
| 2025-06-01 | Implantable microchips and AI for cattle monitoring · nexa.farm | acquired |
| 2019-01-01 | YCDoorport Acquired by Alarm.com - We make existing apartment access smart. · doorport.com | acquired |
| 2020-06-01 | We break viruses · pardesbio.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.