Cohorts of 2021
Companies whose accelerator cohort started in 2021. 1,685 companies.
clusterB2B SaaS 183Consumer 168Fintech 155Healthcare and bio 126Commerce and marketplaces 111Developer tools 68Climate and energy 66Vertical AI agents 66Robotics and physical world 59Security and compliance 34Other 28Data for AI 24Horizontal AI assistants 17Defense and space 15Agent infrastructure 13AI infra and compute 7
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| AbbotAI Your Customer Success Co-Pilot | Horizontal AI assistantsCustomer success copilot for Slack | Y CombinatorS21 | Inactive | checked 2026-08-17 |
| CoLoopAI AI Copilot for insights & strategy | Horizontal AI assistantsAI copilot for customer insights and strategy | Y CombinatorS21 | Active | checked 2026-08-23 |
| Forage MailAI AI that solves email overwhelm. Not another mail app. | Horizontal AI assistantsEmail prioritization and summarization | Y CombinatorS21 | Inactive | checked 2026-08-17 |
| Hera Calendar app to prepare, join and follow-up on virtual meetings | Horizontal AI assistantsAI-powered virtual meeting assistant | Y CombinatorS21 | Inactive | checked 2026-08-23 |
| SentiyenAI Conversational AI assistants using your knowledge | Horizontal AI assistantsconversational AI for customer engagement | Y CombinatorS21 | Inactive | checked 2026-08-17 |
| arnataAI AI workers for the logistics industry. | Horizontal AI assistantsAI workers for logistics | Y CombinatorW21 | Active | checked 2026-08-23 |
| Compose.aiAI Cut your writing time by 40% with AI-powered autocomplete | Horizontal AI assistantsAI writing autocomplete assistant | Y CombinatorW21 | Active | checked 2026-08-23 |
| FathomAI The most flexible AI meeting notetaker ever built. | Horizontal AI assistantsAI meeting notetaker and knowledge retrieval | Y CombinatorW21 | Active | checked 2026-08-23 |
| FirstSupport.ai AI Assistant for Customer Support | Horizontal AI assistantsAI copilot for customer support agents | Y CombinatorW21 | Site unreachable | checked 2026-08-17 |
| FrizAI AI Social Media Manager | Horizontal AI assistantsAI social media content management | Y CombinatorW21 | Acquired | checked 2026-08-17 |
| PingPong Video messaging app for remote teams. | Horizontal AI assistantsasync video collaboration platform | Y CombinatorW21 | Acquired | checked 2026-08-17 |