You asked about Design
75 people built something like it. 1 is gone.
That is 1% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2025-01-01 | YCMastra The Javascript framework for building AI agents, from the Gatsby devs · mastra.ai | still up |
| 2025-01-01 | Agents for Accelerated Clinical Trial Design · delineate.pro | still up |
| 2025-06-01 | YCF2 The AI platform for private markets investors · f2.ai | still up |
| 2025-01-01 | YCHUD Platform for building RL environments and evals · hud.ai | still up |
| 2025-01-01 | YCWeave AI to understand and then route engineering work · weaveos.com | still up |
| 2025-06-01 | YCidler Hill-climb any benchmark, for any model, in any domain. · idler.ai | still up |
| 2025-06-01 | YCWafer AI that makes AI fast · wafer.ai | still up |
| 2025-09-01 | YCMOVEdot AI Agents for Hardware Engineering · movedot.ai | still up |
| 2025-06-01 | Give engineering, product, and design teams insight into unseen issues · interfere.com | still up |
| 2025-06-01 | Tiny Edge AI For Tiny Devices · cactuscompute.com | still up |
| 2025-01-01 | The LLM Eval and Observability Platform for AI Quality · confident-ai.com | still up |
| 2025-09-01 | Accelerate Product Iteration · atlasgrid.ai | still up |
| 2025-01-01 | connect, migrate and implement enterprise systems · superglue.ai | still up |
| 2025-01-01 | Reasoning Fine-Tuning · trainloop.ai | still up |
| 2025-06-01 | YCEmbedder Hardware-Aware AI for Embedded Software Development · embedder.com | still up |
| 2025-01-01 | YCOki The digital home for your personal memories · okihome.ai | still up |
| 2025-06-01 | YCHera AI Motion Designer · hera.video | still up |
| 2025-09-01 | YCAntigen Continuous offensive security for the enterprise. · antigen.sh | still up |
| 2025-06-01 | YCLark The E2E testing layer for AI-driven development · getlark.ai | still up |
| 2025-01-01 | An AI teammate that automatically updates your customer-facing docs · promptless.ai | still up |
| 2025-09-01 | YCCaddy Your Personal AI for everyday work. Lives in your texts. · caddy.app | still up |
| 2025-06-01 | YCAutosana AI agents for E2E testing across mobile & web · autosana.ai | still up |
| 2025-09-01 | Training Data for Recursive Self-Improvement · hillclimb.com | still up |
| 2025-06-01 | YCOmnara The Open-Source Alternative to Claude Managed Agents · omnara.com | still up |
| 2025-06-01 | YCFloot The app platform inside Claude and ChatGPT. · floot.com | still up |
| 2025-01-01 | YCAdam AI Powered CAD · adam.new | still up |
| 2025-09-01 | YCPerseus Applied Lab focused on Search in Latent Spaces. · perseus.computer | still up |
| 2025-01-01 | YCArtifact An Collaborative, AI-native IDE for Hardware Engineers · artifact.engineer | still up |
| 2025-01-01 | YCOnlook Cursor for Designers · onlook.com | still up |
| 2025-06-01 | Open source self-improving layer for AI agents · traceroot.ai | still up |
| 2025-09-01 | YCRovr AI FDE Engine that runs your engineering workflows · withrovr.com | gone |
| 2025-06-01 | World's largest crowdsourced benchmark for AI-generated design · designarena.ai | still up |
| 2025-09-01 | Robots with soul · lightberry.com | still up |
| 2025-01-01 | YCDalus AI-Powered Hardware System Design Software · dalus.io | still up |
| 2025-09-01 | YCMSPilot Turn AI adoption into a recurring revenue line. · mspilot.io | still up |
| 2025-09-01 | YCFastshot Lovable for mobile apps · fastshot.ai | still up |
| 2025-09-01 | YCAspect Intelligent media storage for creative teams. · aspect.inc | still up |
| 2025-09-01 | YCSemiotic Studio-Grade Design at Scale · semiotic.com | still up |
| 2025-06-01 | YCBootLoop Firmware in minutes, not months - rigorously tested on real hardware · bootloop.ai | still up |
| 2025-06-01 | YCBitrig Build and ship native Swift apps with AI · bitrig.com | still up |
| 2025-01-01 | YCAxal We design, assemble, and test custom PCBs fast. · axal.ai | still up |
| 2025-06-01 | YCMonte Continual Learning for Agents · trymonte.ai | still up |
| 2025-01-01 | Electrical Engineering Components Compaion · stillwind.ai | still up |
| 2025-01-01 | YCTrim A foundation model for physics. · trimresearch.com | still up |
| 2025-01-01 | YCa0.dev We make mobile apps using AI. · a0.dev | still up |
| 2025-09-01 | Helping humans and AI agents understand massive codebases · sourcebot.dev | still up |
| 2025-06-01 | The Open Source Agentic IDE · stagewise.io | still up |
| 2025-01-01 | The social network layer for AI apps · a1zap.com | still up |
| 2025-01-01 | AI Agents for Complex Engineering Projects · macadamialabs.com | still up |
| 2025-06-01 | The AI workspace for software implementations · datafruit.ai | still up |
| 2025-09-01 | YCLocus Payment infrastructure for AI agents · paywithlocus.com | still up |
| 2025-06-01 | Open source inference server for local models · magnitude.dev | still up |
| 2025-01-01 | YCSubtrace Zero code network tracer · subtrace.dev | still up |
| 2025-06-01 | Building tiny frontier AI models that run on edge devices · stellonlabs.com | still up |
| 2025-01-01 | AWS for AI Agents · trytruffle.ai | still up |
| 2025-06-01 | The Cursor for Chip Design - Delivering Silicon-Ready Chip Designs… · sigmanticai.com | still up |
| 2025-06-01 | Self learning computer use agent for developers · cyberdesk.io | still up |
| 2025-09-01 | YCdari.dev The Routing Layer for AI Agents · dari.dev | still up |
| 2025-06-01 | Physics-based foundation models for CAD optimization. · topological.com | still up |
| 2025-06-01 | Synthetic Videos to Simulate Real Users · syntheticsociety.ai | 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.