You asked about Developer Tools
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2015-01-01 | YCGitLab A complete DevOps platform delivered as a single application. · gitlab.com | acquired |
| 2012-01-01 | Digital Analytics Platform · amplitude.com | acquired |
| 2008-01-01 | YCHeroku Enabling developers to build and run applications in the cloud. · heroku.com | acquired |
| 2012-01-01 | YCAuthy Authy is a Two-Factor Authentication platform for developers · authy.com | acquired |
| 2016-01-01 | YCGitPrime Visibility and analytics for software development leaders. · gitprime.com | acquired |
| 2017-01-01 | YCArmory Continuous Deployment at any scale, for all developers. · armory.io | acquired |
| 2019-01-01 | YCMemfault First IoT reliability platform for debugging, monitoring, OTA updates · memfault.com | acquired |
| 2013-01-01 | YCBitnami The App Store for Server Software · bitnami.com | acquired |
| 2015-01-01 | Data Versioning, Data Pipelines, and Data Lineage · pachyderm.com | acquired |
| 2014-01-01 | YCDevCycle Feature Flag Management Built for Developers · devcycle.com | acquired |
| 2012-01-01 | YCSwiftype Smart search for the modern team. · swiftype.com | acquired |
| 2020-01-01 | Run machine learning models in the cloud · replicate.com | acquired |
| 2020-01-01 | Data observability for modern data teams · metaplane.dev | acquired |
| 2023-01-01 | YCFern Instantly offer SDKs and API Docs · buildwithfern.com | acquired |
| 2014-06-01 | YCAptible The No Infrastructure Platform as a Service · aptible.com | acquired |
| 2020-01-01 | YCHent Hent is helping land lot developers to better manage their sales… · hent.com.br | acquired |
| 2021-01-01 | YCUiflow No-code platform for enterprise software companies · ycombinator.com | acquired |
| 2022-01-01 | Open-Source Postman alternative · requestly.com | acquired |
| 2023-01-01 | YCLangfuse Open source LLM engineering platform · langfuse.com | acquired |
| 2019-06-01 | YCPopSQL SQL editor for teams · popsql.com | acquired |
| 2019-06-01 | YCBun Bun is an incredibly fast all-in-one JavaScript toolkit · bun.sh | acquired |
| 2020-06-01 | We help ML teams improve their models by improving their datasets · aquariumlearning.com | acquired |
| 2017-06-01 | Code review as a service - combining automation with a network of… · pullrequest.com | acquired |
| 2014-01-01 | YCWit.ai Natural Language for Developers --Wit is an API that makes it easy… · wit.ai | acquired |
| 2022-01-01 | YCSpeechly Natural Language Understanding API for Speech that runs on device · speechly.com | acquired |
| 2021-06-01 | YCArengu Build frictionless signup flows in minutes · arengu.com | acquired |
| 2018-01-01 | CodeStream is a Developer Collaboration Platform designed to… · codestream.com | acquired |
| 2021-01-01 | Supercharge your mobile apps · emergetools.com | acquired |
| 2023-01-01 | Know what your LLM is doing — and why it’s failing · traceloop.com | acquired |
| 2021-01-01 | Build better computer vision models by building better datasets · segments.ai | acquired |
| 2023-01-01 | The open source, fullstack monitoring platform: stop guessing why… · highlight.io | acquired |
| 2021-06-01 | Eliminate Cloud Waste. Attribute and Track Savings. Engage Engineers. · cloudthread.io | acquired |
| 2021-01-01 | YCAvenue Observability platform for operations teams · avenue.app | acquired |
| 2022-01-01 | Artificially Intelligent Corporations · mutable.ai | acquired |
| 2024-01-01 | YCTrieve All-in-one API for search, RAG, & recommendations · trieve.ai | acquired |
| 2022-01-01 | YCHydra Serverless Analytics on Postgres · hydra.so | acquired |
| 2019-01-01 | YCSlapdash Work at the speed of thought · slapdash.com | acquired |
| 2022-06-01 | YCTaro Help high-growth tech companies hire strong engineers · jointaro.com | acquired |
| 2015-06-01 | Bringing transparency to the app stores and helping developers build… · sourcedna.com | acquired |
| 2022-01-01 | YCDecent Cross-chain routing + trading APIs. One-click transactions with any… · decent.xyz | acquired |
| 2019-01-01 | YCVisly Build React components visually · visly.app | acquired |
| 2020-06-01 | YCReflect No-code test automation for web apps · reflect.run | acquired |
| 2019-01-01 | No-code Web Apps testing for everyone · preflight.com | acquired |
| 2018-06-01 | YCOptic Making APIs Developer-friendly · useoptic.com | acquired |
| 2023-01-01 | YCHelicone LLM Observability for Developers · helicone.ai | acquired |
| 2021-06-01 | YCKeyri Secure fraud prevention and authentication platform for developers · keyri.com | acquired |
| 2021-01-01 | Open source continuous profiling software to debug performance issues · pyroscope.io | acquired |
| 2021-01-01 | A faster and more collaborative alternative to Jira for remote teams · kitemaker.co | acquired |
| 2021-06-01 | YCSatsuma Reliable blockchain indexing & querying for web3 engineering teams. · satsuma.xyz | acquired |
| 2023-06-01 | Open source GenAI development platform · flowiseai.com | acquired |
| 2020-06-01 | YCFig Fig adds visual apps, shortcuts, and autocomplete to your terminal. · fig.io | acquired |
| 2015-06-01 | Power your website with Google Spreadsheets.Acquired by Instabase… · cloudstitch.com | acquired |
| 2019-06-01 | Supercharged deployment previews for all. · featurepeek.com | acquired |
| 2021-01-01 | YCFriz AI Social Media Manager · usefriz.com | acquired |
| 2023-01-01 | YCOpenInt Open Source Embedded Product Integrations · openint.dev | acquired |
| 2023-01-01 | The interface for your database · outerbase.com | acquired |
| 2022-06-01 | YCVizzly Customer-Facing Analytics for Modern SaaS. · vizzly.co | acquired |
| 2022-06-01 | YCHyperDX Open-source, dev-friendly observability. · hyperdx.io | acquired |
| 2020-06-01 | Build webapps faster with 10x better CI/CD + preview envs · webapp.io | acquired |
| 2023-06-01 | YCGlide Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra · buildwithglide.com | 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.