TetherIA

TetherIA (also known as Chestnut Robotics) is a Silicon Valley-based full-stack robotics startup founded in January 2025, developing a dexterous robotic hand platform for general-purpose manipulation in humanoid and embodied AI systems. The hand uses tendon-driven actuation with 7 active degrees of freedom and 16 joints, with open-source CAD, firmware, and ROS2 support. The founding team includes engineers from Tesla Optimus, Apple Vision Pro, Waymo, and XPeng.