You asked about Swarm AI
3,977 people built something like it. 578 are gone.
That is 15% of the ones whose fate we could settle, against 23% across the whole register. Half of the gone ones were last seen within 19 months of launching. 239 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2026-06-01 | Mass-produced AI strike systems and Counter-UAS · isengardindustries.com | still up |
| 2023-06-01 | YCSpine AI Manage a swarm of AI agents to get real work done · getspine.ai | still up |
| 2026-09-01 | YCComposal Swarms of agents acting like users to find bugs before release · composal.ai | still up |
| 2026-09-01 | Maximum information per experiment, minimum experiments per conclusion · halmoslabs.com | still up |
| 2026-09-01 | Let your teams' coding agents message each other · agentrelay.com | still up |
| 2026-09-01 | Agent swarms that make long-running tasks exponentially faster · acyclic.dev | still up |
| 2026-09-01 | AI agency that manages paid ads on Meta, Google, LinkedIn, etc. · adside.ai | still up |
| 2026-06-01 | Air Defense as a Service for Civilian Infrastructure. · impact-drones.com | still up |
| 2026-09-01 | YCTopos Agent swarms for formal verification · toposlab.com | still up |
| 2009-01-01 | YCAirbnb Book accommodations around the world. · airbnb.com | acquired |
| 2020-01-01 | The fastest shipping for online shopping · 99minutos.com | still up |
| 2015-01-01 | AI-powered technology enabler and digital transformer of American… · grubmarket.com | still up |
| 2014-01-01 | YCFlexport Platform for global logistics. · flexport.com | still up |
| 2014-01-01 | YCCruise Self-driving cars. · getcruise.com | acquired |
| 2007-01-01 | YCTwitch A global community creating the future of live entertainment. · twitch.com | acquired |
| 2022-11-16 | notion.so | moved |
| 2016-06-01 | YCMeesho Democratizing internet commerce for everyone in India · meesho.com | acquired |
| 2022-02-07 | sha256algorithm.com | still up |
| 2023-05-11 | boringreport.org | still up |
| 2016-06-01 | YCAthelas Extensible, Integrated Technology that Simplifies Health Systems · athelas.com | still up |
| 2016-01-01 | YCPodium Get more leads. Make more money. · podium.com | still up |
| 2015-01-01 | Rebuilding healthcare with AI at the core · akidolabs.com | still up |
| 2017-01-01 | YCFaire The global online platform empowering independent retail. · faire.com | still up |
| 2022-11-02 | photoai.com | still up |
| 2016-01-01 | AI-First Creative Partner for Enterprise Teams · superside.com | still up |
| 2014-06-01 | YCCheckr People infrastructure for the future of work · checkr.com | still up |
| 2022-09-27 | talk.quazel.com | moved |
| 2022-06-15 | softr.io | still up |
| 2021-07-12 | obsidian.md | still up |
| 2023-02-03 | maroofy.com | unverified |
| 2018-06-01 | YCCalii Full-stack grocery delivery in LatAm · calii.com | still up |
| 2022-07-18 | locofy.ai | still up |
| 2022-08-23 | pornpen.ai | gone |
| 2015-06-01 | YCIronclad AI-powered contract management · ironcladapp.com | still up |
| 2019-01-01 | YCNabis Nabis is the largest licensed cannabis wholesale platform. · nabis.com | still up |
| 2023-09-22 | paisa.fyi | still up |
| 2015-06-01 | YCGo1 A learning platform that enables you to train your staff or customers. · go1.com | still up |
| 2022-11-02 | fairmint.com | still up |
| 2022-01-30 | fahrrad-tools.de | still up |
| 2022-11-10 | air.inc | still up |
| 2019-01-01 | YCShipper Southeast Asia’s e-commerce logistics and enablement platform · shipper.id | still up |
| 2018-01-01 | Helloverify is a background screening platform (Checkr for India). · helloverify.ae | still up |
| 2026-08-20 | simedw.com | still up |
| 2022-03-11 | mage.ai | still up |
| 2022-11-30 | thegist.ai | gone |
| 2022-01-11 | myamy.io | moved |
| 2022-11-03 | daily.dev | still up |
| 2019-01-01 | YCNowports The core engine of supply chain in LATAM · nowports.com | still up |
| 2023-04-20 | stretch15.com | still up |
| 2022-02-22 | breakcold.com | still up |
| 2021-01-01 | YCTractian Physical AI for asset-heavy industries · tractian.com | still up |
| 2023-11-27 | trains.fyi | still up |
| 2019-06-01 | Building the safety net of the future · pairteam.com | still up |
| 2018-06-01 | YCLeena AI We at Leena AI build a virtual assistant that answers employee's… · leena.ai | still up |
| 2016-06-01 | YCScale AI Data-centric infrastructure to accelerate the development of AI · scale.com | still up |
| 2019-06-01 | YCLAIKA Online pets supplies for Latin America with over 4000 products & 20… · laika.com.co | still up |
| 2014-01-01 | Training patients and their families with health skills · noorahealth.org | still up |
| 2021-06-01 | YCLemFi Fair, simple and accessible financial services · lemfi.com | still up |
| 2022-05-05 | supermeme.ai | still up |
| 2022-01-26 | divbyzero.com | still up |
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.
Older launches have had longer to die, so this slope is expected. A year that broke it would mean something is wrong with the checking.
Matched on whole words in the title and description, so a launch can fall into two categories and plenty fall into none.
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.