OpenArm

01Where it came from: a voice-AI lab pivots to robotics

OpenArm's roots trace back to Reazon Holdings' in-house R&D division, the Human Interaction Lab, which spent its early years building Japanese speech-recognition models rather than robots. As the lab's research focus shifted toward robotics, Reazon spun that work out into a dedicated subsidiary — Enactic, Inc. — founded in Tokyo on July 23, 2025, under co-founder and CEO Hiroto Yamamoto.

Enactic's own long-term product is Ena, a humanoid robot aimed at Japan's caregiving-labor shortage, targeted for a late-2026 launch. In care facilities, it's meant to:

But before Ena, the company needed real-world manipulation data and a hardware platform other researchers could reproduce on. OpenArm's first release, v0.1, had already shipped quietly as a beta in February 2025; the full public launch — alongside Enactic's own announcement — followed on July 23, 2025, with an unveiling event two days later.

02Design: a research-grade arm meant to be rebuilt exactly

Hardware design

OpenArm's design brief is different from a hobbyist arm like SO-101: it targets labs that need heavier real-world manipulation and true bimanual coordination, not a $100 entry point.

Every joint on both arms runs on a Damiao QDD motor, chosen for the same reason many low-cost legged robots use it — backdrivability that keeps the arm safe to work near, without sacrificing payload.

That combination of compliance and strength is engineered joint by joint:

Software

The software side is documented as thoroughly as the hardware, spanning motion planning, simulation, teleoperation, and dataset tooling:

Licensing

Licensing follows the same split as most open-hardware projects: permissive for the code, more restrictive for the physical design.

03Where it's landed: a launch, a vendor scramble, and an enterprise adopter

Vendors and certification

OpenArm's manufacturing ecosystem grew fast enough to get ahead of the project itself. By October 2025, multiple third-party manufacturers were already selling arms at very different price points and quality levels, prompting the OpenArm team to post a public notice that it had "not officially certified any vendors yet" and to warn against vendors falsely claiming official status.

That gap has since closed: the project's purchase page now runs a three-tier system — a "Certified" manufacturer (WowRobo, in Shenzhen), a Japan-based official supplier working by quotation (RT Corporation, in Tokyo), and a longer list of "Evaluating" and "Not Evaluated" vendors at varying prices.

Enterprise adoption

The clearest sign OpenArm has moved beyond a hobbyist audience came in May 2026, when ACCESS Corporation — a listed Tokyo software company — published a technical column describing its own adoption of a bimanual OpenArm set for physical-AI research: leader-follower teleoperation, imitation-learning dataset collection, and simulation, framed as "step one" toward its own sim-to-real research roadmap.

Separately, drone manufacturer FoxTech began selling "Agility A1," a lower-cost derivative arm ($3,580–$5,800) explicitly built on the OpenArm platform — evidence that the open hardware license is already being used as intended, by outside companies building their own products on top of it.

04Where it fits: turning an arm into a reproducible research loop

OpenArm Cell and OpenArm KER

OpenArm 2.0, which arrived in May 2026, reframes the project around the same idea that motivated it from the start: for physical-AI benchmarks to mean anything, the hardware and the evaluation conditions both need to be identical across labs. Alongside the redesigned arm, two companion products complete that loop.

OpenArm Cell is a standardized evaluation booth — fixed lighting, camera placement, and arm position, plus a Z-axis lift and a light-curtain reach-in stop for safety — meant to let different research teams run the same automated benchmark under identical physical conditions.

OpenArm KER (Kinematic Equivalent Replica) is a motorless, 1.7kg wearable leader arm at 70% of OpenArm 2.0's scale, using 15-bit magnetic encoders instead of motors for low-fatigue teleoperation during long data-collection sessions; it shipped as KER v0.2.0 on June 26, 2026.

LeRobot integration

OpenArm's software ecosystem also gained a significant new door in March 2026, when Hugging Face's LeRobot library added native support for OpenArm — both as a follower robot and as a leader, in single-arm and bimanual configurations — in its v0.5.0 release.

That same release introduced a separate, lower-cost teleoperator called "OpenArm Mini," built around cheaper Feetech bus servos rather than OpenArm's own Damiao motors — a second, less expensive path into OpenArm teleoperation distinct from Enactic's own KER hardware.

Between the official LeRobot integration and the NVIDIA Isaac Lab and MuJoCo simulation packages the project ships itself, OpenArm has become one of a small number of open-source arms with a documented path from teleoperated data collection straight through to policy training.

05Timeline at a glance

06FAQ

07Sources