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Open-source robot arms

SO-101 from The Robot Studio is the arm used with Hugging Face's LeRobot. PAROL6 and Thor are other open-source designs.

Updated November 2, 2026

SO-101 open-source robot arm

Arms to build or hack

  • SO-101 by The Robot Studio
    SO-101

    The Robot Studio · France

    Unlisted · Buy now

    The low-cost open-source arm made with Hugging Face for LeRobot.

  • AR4 MK5 combo kit by Annin Robotics
    AR4 MK5 combo kit

    Annin Robotics · USA

    From $1,189 · Buy now

    The complete AR4 kit. Aluminum, hardware, and the primary electrical parts.

  • RoArm-M2-S by Waveshare
    RoArm-M2-S

    Waveshare · China

    Unlisted · Buy now

    A light 4-DOF desktop arm driven by an ESP32.

  • PiPER by AgileX Robotics
    PiPER

    AgileX Robotics · China

    $1,999 · Buy now

    A light 6-joint arm for research and teleoperation.

Frequently asked questions

What is LeRobot?
An open-source Hugging Face library for training robot policies, built around low-cost arms like SO-101.

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