Hashtag Robotics · Turkey-based robotics technologies

SO-101: real robotics on your desk.

Hashtag Robotics builds and ships robot platforms grounded in the open robotics ecosystem, at engineering quality. Our first platform is SO-101: a 5 DOF, LeRobot-compatible desktop robot arm with a parallel gripper. It ships leader + follower together, assembled and tested; plug it in straight out of the box and start working. Pre-order registration for the first batch is now open.

Explore in 3D

The first batch is limited. Pre-order registration is non-binding and no payment is taken at this stage. When your slot opens, we reach out first with the price and delivery date.

An assembled, ready-to-run open-source robot arm

The SO-101 is an open-source desktop robot arm with 5 DOF and a parallel gripper, built on the open SO-ARM100/SO-101 design and compatible with Hugging Face LeRobot. Hashtag Robotics ships it leader + follower together, assembled and tested, so you skip kit assembly and start running code on day one. It is on free pre-order now, with no payment collected.

Most open-source arms reach you as a kit: a bag of parts, printed components and an assembly guide that can take days to work through. We took a different path. Every SO-101 leaves us fully built, calibrated and tested, so the time you would have spent assembling goes straight into your actual robotics and AI work.

The platform pairs an operator-guided leader arm with a task-performing follower arm. You move the leader by hand and the follower mirrors it one to one, which is exactly the setup teleoperation, data collection and imitation learning workflows are built around.

Technical summary

Small body, real capability.

A fully open-source platform that brings the kinematics of industrial robot arms to your desk.

Motion

5 DOF+ parallel gripper

Actuator

6× STS3215Feetech smart serial servo

Body

3D PrintedPLA / PETG · easy to repair

Software

LeRobotPython · imitation learning

What is in the box

Every part out in the open.

No closed boxes. We openly share the components we use, the materials and where they come from. The arm reaches you assembled and tested, and you know exactly what is inside from the start.

×6 · actuator

Feetech STS3215 Servos

Metal-geared, serial-bus smart servos. They report position and torque feedback and chain together over a single cable.

Metal gearsSerial busFeedback

structure

3D-Printed Body

Base, upper arm, forearm, wrist and all brackets are 3D printed. Easy to repair and customize, with open STL files.

PLA / PETGOpen-source STL

end effector

Parallel Gripper

Grasps objects with a moving and a fixed jaw. The jaw tips are swappable, so it adapts to different tasks.

3D printedModular tip

electronics

Serial-Bus Controller Board

A driver board that runs every servo over a single line. Connects to your computer over USB and control starts instantly.

USBSerial-bus driver

hardware

Mounting Kit

Base mounting plate, screws, spacers and wiring. Ready to set up the moment it comes out of the box.

Mounting plateScrew setCables

software

LeRobot Compatible

Runs with Hugging Face LeRobot. Teleoperation, data collection, imitation learning and autonomous policies, all open.

PythonOpen source

Assembled and tested vs a kit

Both routes can end with the same arm. The difference is the hours between unboxing and your first line of working code.

What you get	SO-101 from Hashtag Robotics	Typical open-source kit
State on arrival	Assembled, calibrated, tested	Loose parts and printed components
Setup before first run	Plug in and run code	Print, build, wire and calibrate yourself
Leader + follower	Both arms included	Varies by source
Software	LeRobot compatible, Python	LeRobot compatible, Python
Design	Open SO-ARM100/SO-101	Open SO-ARM100/SO-101

The SO-101 is the current version of the family. SO-100 is the earlier release, and SO-ARM100 / SO-ARM101 are the same family naming.

How it works

Three steps, zero risk.

Register for pre-order

Fill in the short form and join the pre-order line. It takes a few minutes; registration is non-binding and no payment is taken.

We notify you when your slot opens

When the first batch is ready, we are the first to reach out with the price and delivery date.

Plug in and use

The arm arrives assembled and tested. Plug it in and make its first move with code you write today; no assembly required.

Products

One for now, more on the way.

Pre-order

SO-101 Robot Arm

Leader + follower together, assembled and tested. Ready for teleoperation and imitation learning straight out of the box. Our first product.

Reserve your pre-order

Soon

OpenDuck Mini

A compact, bipedal education robot for walking, balance and reinforcement-learning experiments. The waitlist is open.

Join the waitlist

Frequently asked

Common questions.

What is the SO-101?

The SO-101 is an open-source desktop robot arm with 5 degrees of freedom and a parallel gripper, compatible with the Hugging Face LeRobot ecosystem. It comes as two arms, a leader and a follower, and is designed for teleoperation, data collection and imitation learning.

Does the robot arm ship assembled or as a kit?

It ships assembled and tested. There is no part-by-part assembly; you take it out of the box, plug it in and start using it.

Where can I buy an open-source robot arm?

Hashtag Robotics offers the SO-101 on pre-order. Fill in the pre-order form to reserve your place in line; when your production slot opens we reach out to you with the price and delivery date.

What is the SO-101 used for?

It is used for robotics and AI education, university and research labs, prototyping, teleoperation and imitation learning projects.

What software does it run?

It runs on Hugging Face's open-source LeRobot library. It is programmed in Python and supports teleoperation, data collection and policy training.

What are the leader and follower arms?

The follower is the arm that performs the tasks. The leader is the operator-guided controller arm; it mirrors its motion onto the follower one to one, enabling teleoperation and data collection. The SO-101 pre-order includes both together.

How much is it and how do I buy it?

We are currently in the pre-order phase and no payment is collected. When you register for the pre-order, we will be the first to reach out with the current price and delivery date once your production slot opens.

First batch on pre-order

SO-101 leader + follower, assembled and tested. The first batch is limited. Register for the pre-order; when your slot opens we will be the first to reach out with the price and delivery date. Registration is non-binding, no payment.