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 |
|---|---|---|---|---|
| GreenTallyAI Affordable carbon tracking solution for all businesses | Climate and energyAI-powered carbon accounting platform | Y CombinatorS23 | Inactive | checked 2026-08-23 |
| LeafpressAI AI Energy Management | Climate and energyAI utility energy management | Y CombinatorS23 | Inactive | 2026-08-23 |
| Line.Build Incentives and financing for energy efficiency upgrades | Climate and energyenergy efficiency financing for contractors | Y CombinatorS23 | Inactive | checked 2026-08-17 |
| NectarAI Manage energy cost & usage with AI for facility & sustainability teams | Climate and energyAI energy management for buildings | Y CombinatorS23 | Active | checked 2026-08-23 |
| Ohmic Biosciences Genetically engineering plants for disease resistance. | Climate and energyagricultural biotech for crop resilience | Y CombinatorS23 | Active | checked 2026-08-23 |
| Orbio EarthAI Tracking methane emissions with satellites | Climate and energymethane emissions satellite monitoring | Y CombinatorS23 | Site unreachable | checked 2026-08-17 |
| AtmetoAI We develop ML that optimizes how batteries in the grid store energy | Climate and energyBattery storage optimization for grids | Y CombinatorW23 | Active | checked 2026-08-23 |
| Coperniq Workflow software for solar & energy contractors ☀️😎 | Climate and energyworkflow software for solar contractors | Y CombinatorW23 | Active | checked 2026-08-23 |
| OutSail Technologies Revolutionary, Modern Wing Sails | Climate and energyautonomous wind-powered marine vessels | Y CombinatorW23 | Inactive | checked 2026-08-17 |
| Overflux Streamline EV charger installations for real estate developers | Climate and energyEV charger installation automation | Y CombinatorW23 | Inactive | - |
| Stralis Aircraft Emission free hydrogen electric aircraft | Climate and energyhydrogen electric aircraft | Y CombinatorW23 | Active | checked 2026-08-23 |