You asked about Time Series
94 people built something like it. 16 are gone.
That is 20% of the ones whose fate we could settle, against 23% across the whole register. 14 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2013-01-01 | The platform for building and operating time series applications. · influxdata.com | still up |
| 2020-06-01 | YCQuestDB High-performance time series database · questdb.com | still up |
| 2024-06-01 | Foundation models for time series · theforecastingcompany.com | still up |
| 2014-01-01 | Open-source time-series data analytics extension for PostgreSQL · pipelinedb.com | acquired |
| 2026-06-01 | YCEdotEnv Quant Neolab building self-improving agents from quant data · edotenv.com | still up |
| 2010-06-01 | Real-time visibility into critical apps and services all in one place. · pagerduty.com | acquired |
| 2020-06-01 | YCPave Plan, communicate, and benchmark your compensation in real-time. · pave.com | still up |
| 2022-01-01 | YCvoize We build the AI companion for nurses, to create time for care. · voize.de | still up |
| 2015-06-01 | YCLugg Move anything, anytime, anywhere · lugg.com | still up |
| 2023-06-01 | YCVetRec AI Scribe for veterinarians. Saving time and improving patient care. · vetrec.io | still up |
| 2021-01-01 | YCDyte Real-time audio & video SDKs, ready to launch 🚀 · dyte.io | acquired |
| 2011-06-01 | Real-time. Big data. PostgreSQL · citusdata.com | acquired |
| 2023-06-01 | Navigating patients to the right place, first time. · healthtech1.uk | still up |
| 2021-01-01 | YCREGENT All-electric seagliders for fast, affordable regional transportation · regentcraft.com | still up |
| 2024-01-01 | YCPointOne AI Time Platform for Law Firms · pointone.com | still up |
| 2024-01-01 | Real-time and two-way sync between CRMs and Databases · stacksync.com | still up |
| 2014-01-01 | YCMixerBox AI Super-Apps to Live Easier | The anything anytime superapps… · mixerbox.com | still up |
| 2017-01-01 | YCExtern Professional Experience Anytime, Anywhere. · extern.com | still up |
| 2022-06-01 | We're building satellites to create a real-time 3D map of the world. · arraylabs.io | still up |
| 2024-09-01 | Real-time B2B data via simple APIs · crustdata.com | still up |
| 2016-01-01 | YCUnima Fast and low-cost diagnostics for real time disease surveillance · unimadx.com | gone |
| 2016-06-01 | Just-in-time training and communication for frontline healthcare teams · elemenohealth.com | still up |
| 2022-01-01 | YCShaped The real-time retrieval engine for search, feeds, and agents. · shaped.ai | still up |
| 2022-01-01 | Software to prevent downtime in a solar plant · smarthelio.com | still up |
| 2021-06-01 | Real-Time Collaborative Transport Management Platform · freterium.com | still up |
| 2014-01-01 | Next Caller creates a positive customer experience through real-time… · nextcaller.com | acquired |
| 2016-01-01 | YCMailTime Emails as quick and easy as text messaging. · mailtime.com | still up |
| 2025-06-01 | Drone submarines · albacore.inc | still up |
| 2023-01-01 | YCMilio B2B-2C real-time account to account payments · miliopay.com | still up |
| 2023-06-01 | YCArtie Software that streams data from databases to warehouses in real-time · artie.com | still up |
| 2008-01-01 | Take Back Control of your Time · rescuetime.com | still up |
| 2009-06-01 | The open source database for the realtime web. · rethinkdb.com | acquired |
| 2014-01-01 | Real time Google Earth for agriculture -- imagery collected weekly… · terravion.com | gone |
| 2016-06-01 | YCSymple Last mile logistics for delivery & service teams. We bring real-time… · getsymple.com | acquired |
| 2015-01-01 | Real-time Nielsen ratings for Brands.Accelerate marketing and product… · ebrandvalue.com | still up |
| 2020-06-01 | YCFormal Take control of your data in real-time. · joinformal.com | still up |
| 2024-06-01 | Ultra-low latency inference cloud for real-time workloads · pipeshift.com | still up |
| 2021-06-01 | Digital pharmacy for Latam, that saves you money and time. · fastfarma.com | gone |
| 2026-06-01 | AI engineer that debugs and fixes production incidents in realtime · hyperprobe.co | still up |
| 2023-01-01 | Less screen time, more life. · clearspace.org | still up |
| 2021-01-01 | YCNoya Radically reducing capital costs and build time for direct air capture · noya.co | gone |
| 2020-01-01 | YCyearend Optimize your equity and taxes in real-time. · yearend.com | still up |
| 2023-01-01 | YCMiracle Accelerate clinical trials with real-time, actionable insights · miracleml.com | still up |
| 2024-01-01 | YCSonia Validated mental health support in your pocket, anytime. · soniahealth.com | still up |
| 2021-01-01 | Cut your writing time by 40% with AI-powered autocomplete · compose.ai | still up |
| 2021-06-01 | YCAgapé Feel close, even when apart. One meaningful conversation at a time. · getdailyagape.com | still up |
| 2023-06-01 | YCUnhaze The right leads at the right time for B2B sales · unhaze.ai | gone |
| 2023-01-01 | YCEzDubs Real-time speech translation · ezdubs.ai | acquired |
| 2021-01-01 | YCAerotime Calendar that kills time fragmentation · aerotime.com | gone |
| 2025-06-01 | Automatically blocking risky behavior with real-time governance agents · truthsystems.ai | still up |
| 2025-01-01 | Fusion reactors for ships · maritimefusion.com | still up |
| 2024-01-01 | YCMarblism AI Employees who love overtime · marblism.com | still up |
| 2026-01-01 | AI Infra for real-time vision applications · overshoot.ai | still up |
| 2025-09-01 | YCMoss Real-time semantic search for Conversational AI · moss.dev | still up |
| 2020-06-01 | YCDuckly Video chat with real-time collaboration. · duckly.com | gone |
| 2025-09-01 | YCs2.dev API for unlimited, durable, real-time streams · s2.dev | still up |
| 2014-06-01 | Real time B2B hotel room marketplace for various industries… · roomstorm.com | still up |
| 2026-06-01 | AI that turns any camera to an autonomous worker with real-time vision · openvector.com | still up |
| 2023-01-01 | YCDecohere Real-time generative AI · decohere.ai | still up |
| 2026-01-01 | YCCaretta Realtime AI for Sales Calls · caretta.so | 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.