Chestnut Robotics x Angel Robotics

Chestnut Robotics (formerly TetherIA) builds tendon-driven dexterous robot hands designed for real-world factory deployment. The company's flagship [Aero Hand](/models/aero-hand) is an 18-DOF production-grade hand with sub-millimeter precision, 0.1 N tactile sensitivity, and 20 kg payload, engineered for 3M+ duty cycles. Chestnut also develops the Aero UMI data-collection exoskeleton and GAIN3D geometry-aware inpainting engine to generate zero-embodiment-gap training data for robotic foundation models. Founded in 2025 in Santa Clara, CA by ex-[Tesla](/companies/tesla) Optimus and [Waymo](/companies/waymo) engineers.

[Angel Robotics](/companies/angel-robotics) is a South Korean wearable robotics company founded in 2017 in Seoul, developing exoskeletons for gait rehabilitation and daily mobility assistance. Products serve healthcare, manufacturing, and defense markets.