You asked about Note-taking
43 people built something like it. 11 are gone.
That is 31% of the ones whose fate we could settle, against 23% across the whole register. 8 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | YCFathom The most flexible AI meeting notetaker ever built. · fathom.ai | acquired |
| 2022-01-01 | An intelligent, visual knowledge base for learning complex topics. · heptabase.com | still up |
| 2010-06-01 | WorkFlowy is a better way to manage information. It provides a simple… · workflowy.com | still up |
| 2020-06-01 | YCClover The all-in-one notebook for creatives to brainstorm, write, and plan… · cloverapp.co | acquired |
| 2025-06-01 | ChatGPT's memory feature in an open, portable format · epicenter.so | still up |
| 2022-06-01 | YCKnowtex Making doctors 2x more efficient with AI note-taking & charge capture · knowtex.ai | still up |
| 2019-01-01 | YCBlitzIQ Note taking workspace for B2B sales teams · blitziq.com | gone |
| 2020-06-01 | Taking from 1 to 100 the premade food industry in LATAM · todoscomemos.com | still up |
| 2015-06-01 | YCGemnote Gemnote is the easiest way to design, create and send custom products. · gemnote.com | still up |
| 2016-06-01 | Bringing 3rd generation, nanopore sequencing to healthcare to solve… · shieldbio.com | gone |
| 2014-06-01 | YCAlchemy Nanotechnology-enabled coatings for automotive and defence sectors · alchemynano.com | still up |
| 2020-01-01 | Nomic is doing for proteins what Illumina has done for DNA · nomic.bio | still up |
| 2017-01-01 | Next-generation mRNA platform to solve cancer, COVID and climate. · helixnano.com | still up |
| 2021-06-01 | Meeting agendas, notes, & goals that tie back to your OKRs · hypercontext.com | gone |
| 2026-01-01 | YCPocket Take Notes in the Real World · heypocket.com | still up |
| 2012-01-01 | YCChute Discover the photos and videos people are taking of your brand or… · getchute.com | acquired |
| 2015-01-01 | YCTeamNote Mobile Productivity(Slack for mobile workforces) · teamnoteapp.com | still up |
| 2024-01-01 | AI-powered meeting notes and automations · circleback.ai | still up |
| 2019-06-01 | Repellent coatings without PFAS · industry.spotlessmaterials.com | still up |
| 2023-01-01 | YCInvitris Creating new protein-based drugs at scale · invitris.com | still up |
| 2023-01-01 | Developing long-lasting drug formulations 50% faster · persist-ai.com | still up |
| 2017-01-01 | YCArylla We connect products to the internet using an invisible, chip-less tag · arylla.com | gone |
| 2019-06-01 | Collaborative data noteboook for business teams · intersectlabs.io | acquired |
| 2024-06-01 | We automate the person taking orders at drive-thrus with a voice AI · drive-thru.ai | gone |
| 2019-01-01 | YCCapture All your notes, tasks, and files in one super-fast workspace. · capture.so | gone |
| 2022-06-01 | Decentralized, anonymous, and accountable identity on Web3. · notebooklabs.xyz | gone |
| 2019-06-01 | Using DNA to store data. · kernsystems.com | still up |
| 2024-01-01 | YCSpeck AI Notetaker that automates all your admin work · speck.sh | acquired |
| 2021-01-01 | Communication and publishing tools for scientists · curvenote.com | still up |
| 2023-06-01 | YCSidenote Meeting follow-up, automated · sidenote.ai | gone |
| 2025-06-01 | YCOpennote The notebook that thinks with you. · opennote.com | acquired |
| 2024-09-01 | YCRelvy AI AI powered debugging notebooks for incident response · relvy.ai | still up |
| 2022-01-01 | YCLivedocs A New Kind of Notebook for Data Storytelling · livedocs.com | gone |
| 2017-01-01 | YCTetra AI notetaker for phone calls · asktetra.com | acquired |
| 2015-01-01 | YCOmniref Sticky notes for code.
(We're building a community-powered,… · omniref.com | gone |
| 2025-01-01 | YCCenote AI agents for conversational commerce · joincenote.com | still up |
| 2025-06-01 | YCChar The AI notepad that knows and works for you · char.com | still up |
| 2010-06-01 | Simplenote (simplenote.com) and the Simperium platform for syncing… · simperium.com | acquired |
| 2024-01-01 | YCOma Care Get paid for taking care of your parents. · omacare.com | still up |
| 2022-06-01 | YCKeylika Redefining the Standard of Care for Iron Deficiency Anemia · keylika.com | still up |
| 2019-06-01 | YCDeepnote A better data science notebook. · deepnote.com | still up |
| 2011-01-01 | YCAcunote acunote.com | still up |
| 2016-01-01 | YCSilver Low cost consumer device for toxin detection. · scansilver.com | gone |
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.