You asked about Carbon Capture and Removal
38 people built something like it. 8 are gone.
That is 24% of the ones whose fate we could settle, against 23% across the whole register. 5 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2017-06-01 | Turning food waste into Biochar to remove CO2 from the atmsophere · releaf.africa | still up |
| 2019-01-01 | YCPachama Restoring nature to solve climate change. · pachama.com | acquired |
| 2020-01-01 | YCSINAI Enterprise software to quantify cost-effective decarbonization… · sinai.com | still up |
| 2021-06-01 | YCAbatable Carbon markets platform and solutions · abatable.com | still up |
| 2022-01-01 | We make carbon negative roads · carboncrusher.io | still up |
| 2021-06-01 | YCHeimdal Affordable and verified direct air carbon capture and storage · heimdalccu.com | gone |
| 2015-01-01 | We design and build microbes to make chemicals greener at lower cost. · imicrobes.com | still up |
| 2022-01-01 | YCAirMyne Building systems to remove carbon dioxide from air at industrial scale · airmyne.com | still up |
| 2022-06-01 | YCALT TEX Biodegradable and carbon neutral textiles, engineered from food waste. · thealttex.com | still up |
| 2021-01-01 | YCNoya Radically reducing capital costs and build time for direct air capture · noya.co | gone |
| 2021-06-01 | YCPhykos Growing seaweed to stabilize the climate. · phykos.co | still up |
| 2021-06-01 | YCCanopi API to measure and eliminate carbon emissions · canopi.cash | gone |
| 2021-01-01 | YCRemora Carbon capture for vehicles · remoracarbon.com | still up |
| 2022-01-01 | YCSeabound Carbon capture equipment for ships · seabound.co | still up |
| 2013-01-01 | YCHeap Captures user interactions with no code to generate analytics. · heap.io | acquired |
| 2017-01-01 | YCSolugen Decarbonizing the chemicals industry. · solugen.com | still up |
| 2016-06-01 | YCValidere A carbon MRV solution for energy and hard-to-abate sectors · validere.com | still up |
| 2022-01-01 | Enterprise software for companies to track & reduce their carbon… · unravelcarbon.com | still up |
| 2020-01-01 | maximizing biomass on low quality land · livingcarbon.com | still up |
| 2018-06-01 | Next-gen ingredients to decarbonize consumer products, starting w/… · c16bio.com | still up |
| 2022-01-01 | Unlocking carbon markets for European forest owners · pina.earth | acquired |
| 2019-01-01 | We use solar and wind power to make zero net carbon electrofuels · prometheusfuels.com | still up |
| 2021-06-01 | Decarbonizing the fashion industry · carbonfact.com | still up |
| 2017-06-01 | YCAirthium Decarbonized heat and power cheaper than fossil fuels · airthium.com | still up |
| 2020-06-01 | We help companies automate the accounting of their carbon emissions · carbonchain.com | still up |
| 2016-01-01 | Carbon neutral packaging for ambitious businesses. · georgettepackaging.com | gone |
| 2015-01-01 | YCVanhawks We are making the smart carbon fibre commuting bike and platform for… · vanhawks.com | acquired |
| 2018-06-01 | YCLowkey Capture, create, & share gaming moments (Acquired by Niantic!) · lowkey.gg | acquired |
| 2024-06-01 | Vanta for carbon compliance · useoffstream.com | still up |
| 2019-06-01 | YCWren Wren is a monthly subscription to offset your carbon footprint. · wren.co | still up |
| 2022-01-01 | We make carbon negative chemicals from CO2 using fermentation · phasebiolabs.com | still up |
| 2023-01-01 | Phone AI that Captures Every Dealership Revenue Opportunity · shortloop.dev | still up |
| 2019-01-01 | YCCapture All your notes, tasks, and files in one super-fast workspace. · capture.so | gone |
| 2016-01-01 | YCEnflux Motion capture clothing for injury prevention · getenflux.com | gone |
| 2023-06-01 | Affordable carbon tracking solution for all businesses · greentally.ai | gone |
| 2020-01-01 | A Global Payouts API for Startups · carbon.money | gone |
| 2022-06-01 | YCKnowtex Making doctors 2x more efficient with AI note-taking & charge capture · knowtex.ai | still up |
| 2024-06-01 | Transform Images And Videos Into Immersive 3D With AI · digitalcarbon.ai | still up |
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.