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Physical AI software · early

Fern

Corporate marketsimulationdata-engineCurated record

Fern (legal entity Ishiki Labs, Inc.) builds learned, action-conditioned world-model simulators for robots, trained end-to-end from a customer's real teleoperation data. Companies upload as little as ~6 hours of teleop recordings per task and Fern fits a high-fidelity world model to that specific embodiment and environment. The simulator is exposed as Gym-style environments for offline/online RL training and as a managed cloud platform for evaluating robot policy checkpoints without running on physical hardware. Because the simulator is learned from the same real-robot data policies train on, the exact deployment checkpoint is evaluated without sim-specific fine-tuning.

HeadquartersSan Francisco, US
Founded2025
Corporate fundingNot disclosed
TeamNot listed
Deployments0
Open roles0
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Company overview

Identity and operating footprint

Company typePhysical AI software
Market segmentCorporate
StageY Combinator (W26); round amount undisclosed
FoundersAmit Yadav (Co-Founder & CEO), Robert Xu (Co-Founder & CTO)
Regions servedNorth America
Countries deployedNot listed
Service footprintNot listed
Last reviewed2026-07-16
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Company timeline

Milestones and announcements

2026-06-01Published whitepaper 'Learned simulators for evaluating general robot policies' describing a production learned simulator that generates 256x256 multi-camera RGB rollouts action-conditioned on end-effector commands for bimanual robotsFern (Ishiki Labs, Inc.)
2026-01-01Joined Y Combinator Winter 2026 batchY Combinator
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Source ledger

2 unique public sources