# buildrobots.io

> A field guide to open robots you can build: grippers, rovers, arms, hands, quadrupeds and humanoids.
> Same Open Robot Package (ORP) format and the same /{org}/{robot} paths as the Hyperspawn humanoid suite.
> Data comes from the open registry. Unknown facts are left unknown.

## Key URLs
- https://buildrobots.io/ : class taxonomy and the starter ladder (first robot -> next -> humanoid)
- https://buildrobots.io/start : guided picker (budget, tools, goal)
- https://buildrobots.io/learn : first-robot guides (also learn.buildrobots.io): 3 paths, 29 checked courses/docs/repos
- https://buildrobots.io/learn/arm : Arm path, 5 steps
- https://buildrobots.io/learn/quadruped : Quadruped path, 4 steps
- https://buildrobots.io/learn/humanoid : Humanoid path, 4 steps
- https://buildrobots.io/grippers : grippers (1 indexed)
- https://buildrobots.io/rovers : rovers (3 indexed)
- https://buildrobots.io/arms : arms (7 indexed)
- https://buildrobots.io/hands : hands (3 indexed)
- https://buildrobots.io/quadrupeds : quadrupeds (6 indexed)
- https://buildrobots.io/humanoids : humanoids (52 indexed)
- https://buildrobots.io/sitemap.xml

## Starter ladder (computed)
- Rung 1 (First robot): SO-101 (SO-ARM101) https://buildrobots.io/therobotstudio/so-101
- Rung 2 (Next): Aero Hand Open https://buildrobots.io/chestnut/aero-hand-open
- Rung 3 (Humanoid): Z-Bot (Zeroth Bot) https://buildrobots.io/kscale/zbot

## Difficulty index (lower is easier)
- class base (1 to 5): gripper 1 · rover 1.5 · arm 2 · hand 3 · quadruped 3.5 · humanoid 5
- cost (0 to 3): log10(USD / 100): $100 → 0, $1k → 1, $10k → 2, $100k → 3. BOM total if a build package exists, else list price.
- degrees of freedom (0 to 3): DOF / 10, capped at 3
- part count (0 to 2): log10(parts / 10): BOM quantities + fabricated parts
- Unknown cost/DOF/parts count at the midpoint of their range.

## Learning resources (links checked)
- LeRobot documentation (Hugging Face, docs): https://huggingface.co/docs/lerobot/index
- SO-101 setup guide (Hugging Face LeRobot, docs): https://huggingface.co/docs/lerobot/so101
- Imitation learning on real-world robots (Hugging Face LeRobot, docs): https://huggingface.co/docs/lerobot/il_robots
- Robotics course (Hugging Face Learn, course): https://huggingface.co/learn/robotics-course
- SO-ARM100 / SO-101 hardware repo (The Robot Studio, repo): https://github.com/TheRobotStudio/SO-ARM100
- Low-cost robot arm (Koch v1.1) (Alexander Koch, repo): https://github.com/AlexanderKoch-Koch/low_cost_robot
- MuJoCo documentation (Google DeepMind, docs): https://mujoco.readthedocs.io/en/stable/overview.html
- MuJoCo Python tutorial notebook (Google DeepMind, notebook): https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/tutorial.ipynb
- MuJoCo Playground (Google DeepMind, tool): https://playground.mujoco.org/
- ROS 2 tutorials (Jazzy) (Open Robotics, docs): https://docs.ros.org/en/jazzy/Tutorials.html
- MoveIt 2 tutorials (PickNik Robotics, docs): https://moveit.picknik.ai/main/doc/tutorials/tutorials.html
- Modern Robotics: Mechanics, Planning, and Control (Kevin Lynch & Frank Park, Northwestern, book): https://hades.mech.northwestern.edu/index.php/Modern_Robotics
- Modern Robotics specialization (Northwestern University on Coursera, course): https://www.coursera.org/specializations/modernrobotics
- Underactuated Robotics (Russ Tedrake, MIT, book): https://underactuated.mit.edu/
- Robotic Manipulation (Russ Tedrake, MIT, book): https://manipulation.mit.edu/
- ODrive getting started (ODrive Robotics, docs): https://docs.odriverobotics.com/v/latest/guides/getting-started.html
- moteus brushless controller (mjbots, repo): https://github.com/mjbots/moteus
- Open robot actuator hardware (Open Dynamic Robot Initiative, repo): https://github.com/open-dynamic-robot-initiative/open_robot_actuator_hardware
- Petoi documentation (Petoi, docs): https://docs.petoi.com/
- OpenCat firmware (Petoi, repo): https://github.com/PetoiCamp/OpenCat
- Pupper v3 documentation (Stanford Student Robotics, docs): https://pupper-v3-documentation.readthedocs.io/en/latest/
- Pupper independent study (Stanford, course): https://pupper-independent-study.readthedocs.io/en/latest/
- StanfordQuadruped code (Stanford Student Robotics, repo): https://github.com/stanfordroboticsclub/StanfordQuadruped
- legged_gym (ETH Zurich Robotic Systems Lab, repo): https://github.com/leggedrobotics/legged_gym
- Isaac Lab documentation (NVIDIA, docs): https://isaac-sim.github.io/IsaacLab/main/index.html
- unitree_rl_gym (Unitree Robotics, repo): https://github.com/unitreerobotics/unitree_rl_gym
- Open Duck Mini (Antoine Pirrone, repo): https://github.com/apirrone/Open_Duck_Mini
- Berkeley Humanoid Lite docs (UC Berkeley Hybrid Robotics, docs): https://berkeley-humanoid-lite.gitbook.io/docs
- LeRobot source (Hugging Face, repo): https://github.com/huggingface/lerobot

## Robots
- NEO (1X Technologies) · humanoid · index 9.8 · openness 0/100 · https://buildrobots.io/1x/neo
- AgiBot A2 (Yuanzheng) (AgiBot (Zhiyuan Robotics)) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/agibot/a2
- AgiBot Lingxi X1 (AgiBot (Zhiyuan Robotics)) · humanoid · index 11.5 · openness 85/100 · https://buildrobots.io/agibot/x1
- Cassie (Agility Robotics) · humanoid · index 8.5 · openness 20/100 · https://buildrobots.io/agility/cassie
- Digit (Agility Robotics) · humanoid · index 10.3 · openness 0/100 · https://buildrobots.io/agility/digit
- Koch v1.1 Low-Cost Robot Arm (Alexander Koch / Hugging Face LeRobot) · arm · index 4.9 · openness 75/100 · https://buildrobots.io/alexanderkoch/koch-v1-1
- AR4 (Annin Robotics) · arm · index 4.7 · openness 90/100 · https://buildrobots.io/anninrobotics/ar4
- Apollo (Apptronik) · humanoid · index 9 · openness 20/100 · https://buildrobots.io/apptronik/apollo
- Berkeley Humanoid (UC Berkeley Hybrid Robotics Lab) · humanoid · index 8.7 · openness 30/100 · https://buildrobots.io/berkeley/humanoid
- Berkeley Humanoid Lite (UC Berkeley Hybrid Robotics Lab) · humanoid · index 10.8 · openness 100/100 · https://buildrobots.io/berkeley/humanoid-lite
- Booster K1 (Booster Robotics) · humanoid · index 9.9 · openness 30/100 · https://buildrobots.io/booster/k1
- Booster T1 (Booster Robotics) · humanoid · index 9.8 · openness 30/100 · https://buildrobots.io/booster/t1
- Atlas (electric) (Boston Dynamics) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/bostondynamics/atlas
- Atlas (hydraulic) (Boston Dynamics) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/bostondynamics/atlas-hydraulic
- Aero Hand Open (Chestnut Robotics (formerly TetherIA)) · hand · index 5.5 · openness 90/100 · https://buildrobots.io/chestnut/aero-hand-open
- LEAP Hand (Carnegie Mellon University) · hand · index 6.6 · openness 75/100 · https://buildrobots.io/cmu/leap-hand
- Duke Humanoid v1 (Duke University General Robotics Lab) · humanoid · index 9.3 · openness 85/100 · https://buildrobots.io/duke/duke-humanoid
- EngineAI PM01 (EngineAI (Zhongqing Robotics)) · humanoid · index 10.5 · openness 30/100 · https://buildrobots.io/engineai/pm01
- Ameca (Engineered Arts) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/engineeredarts/ameca
- Figure 02 (Figure AI) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/figure/02
- Figure 03 (Figure AI) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/figure/03
- Fourier GR-1 (Fourier (Fourier Intelligence)) · humanoid · index 9 · openness 30/100 · https://buildrobots.io/fourier/gr1
- Fourier GR-2 (Fourier (Fourier Intelligence)) · humanoid · index 10.5 · openness 30/100 · https://buildrobots.io/fourier/gr2
- Fourier N1 (Fourier (Fourier Intelligence)) · humanoid · index 9.9 · openness 85/100 · https://buildrobots.io/fourier/n1
- Galbot G1 (Galbot (Galaxy General Robot)) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/galbot/g1
- HopeJR (The Robot Studio & Hugging Face) · humanoid · index 10.7 · openness 90/100 · https://buildrobots.io/huggingface/hopejr
- HMND 01 (Humanoid (SKL Robotics Ltd)) · humanoid · index 10.4 · openness 0/100 · https://buildrobots.io/humanoid/hmnd-01
- Dropbear (Hyperspawn Robotics) · humanoid · index 12 · openness 100/100 · https://buildrobots.io/hyperspawn/dropbear
- InMoov (Gael Langevin) · humanoid · index 9.4 · openness 70/100 · https://buildrobots.io/inmoov/inmoov
- JPL Open Source Rover (NASA Jet Propulsion Laboratory) · rover · index 5.9 · openness 90/100 · https://buildrobots.io/jpl/open-source-rover
- Kepler Forerunner K2 "Bumblebee" (Kepler Robotics (Shanghai Kepler Exploration Robot Co.)) · humanoid · index 11.5 · openness 0/100 · https://buildrobots.io/kepler/k2
- K-Bot (K-Scale Labs) · humanoid · index 10.9 · openness 100/100 · https://buildrobots.io/kscale/kbot
- Z-Bot (Zeroth Bot) (K-Scale Labs) · humanoid · index 8.4 · openness 90/100 · https://buildrobots.io/kscale/zbot
- Leju Kuavo (Leju Robotics) · humanoid · index 9 · openness 30/100 · https://buildrobots.io/leju/kuavo
- Asimov 1 (Menlo Research (Asimov)) · humanoid · index 11.8 · openness 70/100 · https://buildrobots.io/menlo/asimov
- MenteeBot (Mentee Robotics) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/mentee/menteebot
- 4NE1 (NEURA Robotics) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/neura/4ne1
- Noetix Bumi (Noetix Robotics (Songyan Dynamics)) · humanoid · index 9.2 · openness 0/100 · https://buildrobots.io/noetix/bumi
- Noetix N2 (Noetix Robotics (Songyan Dynamics)) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/noetix/n2
- Solo-12 (Open Dynamic Robot Initiative) · quadruped · index 8.2 · openness 90/100 · https://buildrobots.io/odri/solo-12
- Kangaroo (PAL Robotics) · humanoid · index 9 · openness 30/100 · https://buildrobots.io/pal/kangaroo
- TALOS (PAL Robotics) · humanoid · index 10.5 · openness 30/100 · https://buildrobots.io/pal/talos
- Bittle / Bittle X (Petoi) · quadruped · index 7.5 · openness 45/100 · https://buildrobots.io/petoi/bittle
- Adam Lite (PNDbotics) · humanoid · index 10 · openness 20/100 · https://buildrobots.io/pndbotics/adam-lite
- AmazingHand (Pollen Robotics) · hand · index 6.5 · openness 90/100 · https://buildrobots.io/pollen/amazing-hand
- Reachy 2 (Pollen Robotics (Hugging Face)) · humanoid · index 10.6 · openness 45/100 · https://buildrobots.io/pollen/reachy2
- Poppy Humanoid (Poppy Project (Inria Flowers)) · humanoid · index 8.7 · openness 90/100 · https://buildrobots.io/poppy/poppy-humanoid
- PUDU D9 (Pudu Robotics) · humanoid · index 10.5 · openness 0/100 · https://buildrobots.io/pudu/d9
- Rainbow Robotics RB-Y1 (Rainbow Robotics) · humanoid · index 9.5 · openness 30/100 · https://buildrobots.io/rainbow/rby1
- ROBOTO_ORIGIN (RoboParty (Shanghai RoboParty Technology)) · humanoid · index 10.8 · openness 100/100 · https://buildrobots.io/roboparty/roboto-origin
- ROBOTIS OP3 (ROBOTIS) · humanoid · index 9.5 · openness 45/100 · https://buildrobots.io/robotis/op3
- OpenMANIPULATOR-X (RM-X52-TNM) (ROBOTIS) · arm · index 5 · openness 30/100 · https://buildrobots.io/robotis/openmanipulator-x
- Phoenix (Sanctuary AI) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/sanctuary/phoenix
- Sawppy the Rover (Roger Cheng) · rover · index 5.4 · openness 70/100 · https://buildrobots.io/sawppy/sawppy
- PAROL6 (Source Robotics) · arm · index 5.7 · openness 90/100 · https://buildrobots.io/sourcerobotics/parol6
- ALOHA (Stanford (Tony Zhao et al.)) · arm · index 6.7 · openness 85/100 · https://buildrobots.io/stanford/aloha
- Stanford Pupper (v1) (Stanford Student Robotics) · quadruped · index 6.5 · openness 70/100 · https://buildrobots.io/stanford/pupper
- Pupper v3 (Stanford Student Robotics / Hands-On Robotics) · quadruped · index 7.6 · openness 100/100 · https://buildrobots.io/stanford/pupper-v3
- ToddlerBot (Stanford University) · humanoid · index 11.4 · openness 100/100 · https://buildrobots.io/stanford/toddlerbot
- UMI Gripper (Universal Manipulation Interface) (Stanford / Columbia / Toyota Research Institute) · gripper · index 4.1 · openness 85/100 · https://buildrobots.io/stanford/umi-gripper
- Optimus (Tesla) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/tesla/optimus
- SO-100 (SO-ARM100) (The Robot Studio / Hugging Face) · arm · index 3.4 · openness 100/100 · https://buildrobots.io/therobotstudio/so-100
- SO-101 (SO-ARM101) (The Robot Studio / Hugging Face) · arm · index 3.7 · openness 100/100 · https://buildrobots.io/therobotstudio/so-101
- UBTech Walker S (S1 / S2) (UBTech Robotics) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/ubtech/walker-s
- LeKiwi (SIGRobotics UIUC / Hugging Face LeRobot) · rover · index 4.4 · openness 90/100 · https://buildrobots.io/uiuc/lekiwi
- Unitree G1 (Unitree Robotics) · humanoid · index 10.4 · openness 40/100 · https://buildrobots.io/unitree/g1
- Unitree Go2 (Unitree Robotics) · quadruped · index 6.9 · openness 30/100 · https://buildrobots.io/unitree/go2
- Unitree H1 (Unitree Robotics) · humanoid · index 9.8 · openness 40/100 · https://buildrobots.io/unitree/h1
- Unitree H1-2 (Unitree Robotics) · humanoid · index 10.2 · openness 40/100 · https://buildrobots.io/unitree/h1-2
- Unitree R1 (Unitree Robotics) · humanoid · index 10.4 · openness 30/100 · https://buildrobots.io/unitree/r1
- XPeng IRON (XPeng) · humanoid · index 9 · openness 0/100 · https://buildrobots.io/xpeng/iron
- openDog V3 (James Bruton (XRobots)) · quadruped · index 8.5 · openness 70/100 · https://buildrobots.io/xrobots/opendog

## Suite
- https://humanoidrobot.build : Build it
- https://humanoidrobots.training : Train it
- https://humanoidrobots.systems : Know it
- https://humanoidrobots.team : Find its crew
- https://humanoidrobots.earth : See it on the map
- https://buildhumanoids.dev : Open Robot Package spec, CLI, SDKs
- https://buildrobots.io : Every kind of robot
- https://clanker.free : Make a robot dance
- https://hyperspawn.ai : Hyperspawn and Dropbear
- https://hyperspawn.app : Your robots, builds, runs
- https://hyperspawn.io : Registry API and MCP server
- https://hyperspawn.org : Repos, grants, bounties