YC batches · batch ranking
YC W21 — Winter 2021YC W21
The 7 Winter 2021 companies we track, ranked by evidence-graded agent readiness — can an agent actually drive this product? — then built-in AI and PA Score.
This is the YC W21 companies we track, judged on evidence — not a batch-wide census (yet). Coverage grows batch by batch. Scores come from each product’s arena verdicts — see methodology.
| # | Product | Agent-ready? | Built-in AI | PA Score |
|---|---|---|---|---|
| 1 |  OpenCodeAI Coding AgentsOpen source | 62/100 | 74/100 | 47/100 |
| 2 |  VapiVoice Agent Platforms | 61/100 | 21/100 | 28/100 |
| 3 |  FathomMeeting AI & Notetakers | 61/100 | 38/100 | 39/100 |
| 4 |  OllamaLocal LLM RuntimesOpen source | 42/100 | 12/100 | 22/100 |
| 5 |  SplineDesign & Prototyping | 40/100 | 60/100 | 32/100 |
| 6 |  SigNozObservability & MonitoringOpen source | 35/100 | 24/100 | 23/100 |
| 7 |  FirstbaseStartup Legal & Incorporation | 0/100 | 0/100 | 0/100 |
A product tracked in more than one arena appears once, in the arena where its PA Score is highest. Unscored means no applicable cells — never zero. Batch stamps verified against YC’s public directory by website domain, never by name.