You asked about Batteryless IoT Sensors
31 people built something like it. 31 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2019-01-01 | Portal Entryways upgrades disabled-accessible doors so they can be… · portalentryways.com | gone |
| 2018-01-01 | Engineering next-generation, brain-penetrant cancer therapies. · reverielabs.com | gone |
| 2016-01-01 | YCUnima Fast and low-cost diagnostics for real time disease surveillance · unimadx.com | gone |
| 2018-01-01 | YCOvipost Automated insect farming · ovipost.com | gone |
| 2022-08-12 | merliot.org | gone |
| 2015-01-01 | The robotic cloud laboratory for the life sciences. · transcriptic.com | gone |
| 2017-06-01 | YCSunu Audio and Haptics AR interface equipping blind users with super powers · sunu.com | gone |
| 2018-06-01 | Operating systems for biology labs · radix.bio | gone |
| 2017-01-01 | YCInnaMed At-home blood testing: measure + analyze + enhance. · innamed.com | gone |
| 2023-06-01 | Transform scientific data into discoveries · mantlebio.com | gone |
| 2018-06-01 | Developing novel therapeutics for aging and chronic disease · gerostatealpha.com | gone |
| 2017-06-01 | Rapid, scalable diagnostic for SARS-CoV-2 and beyond · predxionbio.com | gone |
| 2020-01-01 | We’re creating programmable therapies · felixbt.com | gone |
| 2017-01-01 | YCArylla We connect products to the internet using an invisible, chip-less tag · arylla.com | gone |
| 2021-01-01 | Discover drugs that control how much cells "squeeze" to treat disease · forcytebio.com | gone |
| 2023-01-01 | AI for drug formulation · lavo.ai | gone |
| 2015-01-01 | YC20n Using AI to predict biochemistry for manufacturing and therapeutics · 20n.com | gone |
| 2018-06-01 | Democratizing gene therapy by reinventing its manufacturing and… · perception.bio | gone |
| 2017-01-01 | YCCowlar Fitbit for dairy cows. Farms use cowlar's alerts & recommendations to… · cowlar.com | gone |
| 2016-06-01 | Nanoparticle tracers for reservoir characterization during hydraulic… · gtracktechnologies.com | gone |
| 2016-01-01 | YCToymail Connected toys that enable two-way voice messaging between children… · toymail.co | gone |
| 2014-06-01 | YCBeep Cellular networks for IoT. · beepnetworks.com | gone |
| 2014-06-01 | We enable cheaper, faster, and better genetic engineering of plants.… · taxa.com | gone |
| 2014-01-01 | YCEdyn Nest for lawn and garden · edyn.com | gone |
| 2014-01-01 | Device tracks & monitors your car · drivepulseapp.com | gone |
| 2024-06-01 | AI document creation and data management for clinical trials · baselinetrials.com | gone |
| 2023-01-01 | Resolve PR check failures instantly with AI · technician.dev | gone |
| 2013-01-01 | Logiblock engineers electronics and development tools to dramatically… · logiblock.com | gone |
| 2017-01-01 | YCPearl The future of office coffee. Keurig convenience meets cafe quality. · getpearlcoffee.com | gone |
| 2021-06-01 | Technologies for scaling up cultured/clean meat production · micromeat.com | gone |
| 2009-01-01 | Sensors and software for energy tracking. Like 'fitbit' for your… · wattvision.com | gone |
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.