You asked about Alternative Fuels
28 people built something like it. 4 are gone.
That is 16% of the ones whose fate we could settle, against 23% across the whole register. 3 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2026-06-01 | We turn waste gases into supply-secure chemicals · rise-reforming.com | still up |
| 2019-01-01 | Intelline makes the world's most efficient fuel agnostic engines for… · intelline.ca | still up |
| 2014-01-01 | YCPovio Engineering and Design that Fuels Startup Success · povio.com | still up |
| 2018-06-01 | Building a world where alternative proteins are no longer alternative. · gfi.org | still up |
| 2021-01-01 | YCSigNoz Open source alternative to DataDog · signoz.io | still up |
| 2021-06-01 | YCAqua The AI-Native Turnkey Alternative Investment Platform (TAIP) · investwithaqua.com | still up |
| 2019-01-01 | We use solar and wind power to make zero net carbon electrofuels · prometheusfuels.com | still up |
| 2020-06-01 | The open source Looker alternative · lightdash.com | still up |
| 2022-01-01 | Open-Source Postman alternative · requestly.com | acquired |
| 2017-06-01 | YCAirthium Decarbonized heat and power cheaper than fossil fuels · airthium.com | still up |
| 2024-01-01 | YCUbicloud Open source alternative to AWS · ubicloud.com | still up |
| 2022-06-01 | A scalable, cloud-native Perforce and Git alternative · diversion.dev | still up |
| 2016-06-01 | Abundance Labs incubates and builds alternative currency marketplace… · abundancelabs.io | gone |
| 2020-06-01 | Open source alternative to Auth0 / AWS Cognito / Firebase Auth · supertokens.com | still up |
| 2021-06-01 | YCShimmer 1:1 ADHD coaching, 5-10X More affordable than alternatives · shimmer.care | still up |
| 2019-06-01 | YCFlux Flux is building the payment network for alternative payments in… · paywithflux.com | still up |
| 2021-01-01 | DoF provides a high quality, affordable higher education alternative. · degreesoffreedom.org | gone |
| 2021-01-01 | A faster and more collaborative alternative to Jira for remote teams · kitemaker.co | acquired |
| 2025-06-01 | YCOmnara The Open-Source Alternative to Claude Managed Agents · omnara.com | still up |
| 2017-01-01 | YCNuvola Nuvola is transforming battery manufacturing, making EV batteries… · nuvola.tech | still up |
| 2019-06-01 | Souffle Club:10x better LinkedIn alternative with profiles >> resumes · souffle.club | gone |
| 2021-01-01 | Open source mobile marketing platform. Alternative to appcues /… · laudspeaker.com | acquired |
| 2024-06-01 | YCVoid The open source Cursor alternative · useglass.ai | still up |
| 2023-01-01 | YCMatano Cloud Native SIEM (alternative to Splunk/Elastic) · matano.dev | still up |
| 2023-06-01 | YCRecipeUI The open source Postman alternative. · recipeui.com | still up |
| 2026-06-01 | YCExosat Building a neutral, sovereign alternative to Starlink · exosat.com | still up |
| 2017-06-01 | YCWATERFX The world's first 100% sustainable water provider (aka alternative… · wacomet.com | gone |
| 2025-06-01 | YCJuxta Building a GPS alternative 100x more powerful with no hardware needed. · juxta.com | 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.