Y Combinator companies
The Y Combinator portfolio as the radar sees it: synced daily, classified into clusters, checked for life and movement. 6,197 companies.
clusterVertical AI agents 898Consumer 821B2B SaaS 787Fintech 633Developer tools 515Healthcare and bio 477Commerce and marketplaces 433Agent infrastructure 350Robotics and physical world 314Data for AI 192Security and compliance 189Horizontal AI assistants 152AI infra and compute 151Climate and energy 123Defense and space 85Other 44
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| FollowUpThen FollowUpThen is an email-based personal assistant that sends you… | Horizontal AI assistantsEmail-based task reminders and follow-ups | Y CombinatorS17 | Active | checked 2026-08-23 |
| SpeakAI A superhuman, AI-powered language tutor in your pocket | Horizontal AI assistantsAI language tutoring app | Y CombinatorW17 | Active | checked 2026-08-23 |