You asked about Monitoring
36 people built something like it. 6 are gone.
That is 22% of the ones whose fate we could settle, against 23% across the whole register. 9 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2010-06-01 | Real-time visibility into critical apps and services all in one place. · pagerduty.com | acquired |
| 2019-01-01 | YCMemfault First IoT reliability platform for debugging, monitoring, OTA updates · memfault.com | acquired |
| 2020-06-01 | At-Home health monitoring with silicon photonic chips for data centers · siphoxhealth.com | still up |
| 2015-01-01 | Remote patient monitoring for lung disease patients. · spirehealth.com | acquired |
| 2018-06-01 | AIoT monitoring, workflow, and evidence systems for regulated labs. · ilabservice.ai | still up |
| 2024-01-01 | YCRespan Self-driving observability, evals, and gateway for AI agents · respan.ai | still up |
| 2016-01-01 | YCNetBeez Network monitoring from the end-user perspective · netbeez.net | still up |
| 2014-06-01 | A self-healing platform to enrich and fix server alerts automatically · neptune.io | gone |
| 2024-06-01 | YCCoval Simulation & Evaluation that scales voice and chat AI agents · coval.dev | still up |
| 2019-06-01 | YCTraces Transform your video monitoring with AI · traces.ai | still up |
| 2024-01-01 | YCRaindrop Sentry for AI Agents · raindrop.ai | still up |
| 2025-01-01 | AI performance monitoring for factory workers · optifye.ai | still up |
| 2023-01-01 | The open source, fullstack monitoring platform: stop guessing why… · highlight.io | acquired |
| 2018-01-01 | iPhone-based driver monitoring for commercial fleets. · observantai.com | still up |
| 2023-01-01 | YCKeep The open-source AIOps platform · keephq.dev | acquired |
| 2019-06-01 | YCLantern User behavior monitoring for modern product teams · lantern.so | gone |
| 2015-06-01 | YCConvox Open-source tools for deploying, managing, and monitoring cloud… · convox.com | acquired |
| 2018-06-01 | Distributed AI for Industrial Process Monitoring and Optimization. · numericcal.com | gone |
| 2025-06-01 | Implantable microchips and AI for cattle monitoring · nexa.farm | acquired |
| 2021-06-01 | Open-source monitoring for machine learning models · evidentlyai.com | still up |
| 2026-06-01 | AI that runs factories. · controlseat.com | still up |
| 2026-01-01 | YCAshr Enterprise post-training, monitoring, and continual learning platform · ashr.io | still up |
| 2025-09-01 | YCLemma Production Monitoring for AI agents · uselemma.ai | still up |
| 2025-09-01 | Find what's losing you customers and money in your AI agent and fix it · thecontextcompany.com | still up |
| 2024-01-01 | YCClarum AI agents for private market diligence, monitoring, and reporting · clarum.ai | still up |
| 2023-06-01 | YCParea Test, evaluate & observe your LLM applications · parea.ai | still up |
| 2021-06-01 | Reinventing respiration monitoring · makaniscience.net | still up |
| 2021-01-01 | YCParsagon AI to track and analyze public policy · parsagon.io | still up |
| 2015-06-01 | Appcanary tracks the dependencies you use in your apps and servers… · appcanary.com | acquired |
| 2013-06-01 | YCAmulyte Remote monitoring & activity tracking system for seniors. · amulyte.com | gone |
| 2024-01-01 | Modern patient engagement and remote therapeutic monitoring platform · copperhealth.co | still up |
| 2021-01-01 | YCZealth Software for remote monitoring of cancer patients · zealth-ai.com | still up |
| 2026-06-01 | We find where AI agents fail, then train better models to run them. · agnost.ai | still up |
| 2012-01-01 | Sysadmin as a service. We make deploying, configuring, monitoring,… · solidstage.com | gone |
| 2020-06-01 | YCRTCanary We are a monitoring and analytics plugin for all video chat platforms. · rtcanary.com | gone |
| 2013-06-01 | The best way to communicate with users around downtime. · statuspage.io | acquired |
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.