Stanford ToddlerBot vs UBTech Walker S (S1 / S2)
Generated from the registry · revision 2026-09-26 · openness out of 100
ToddlerBot has 13.52 kg less rated payload (1.48 vs 15 kg) than UBTech Walker S (S1 / S2). Openness score: ToddlerBot 100, UBTech Walker S (S1 / S2) 0 (of 100); only ToddlerBot publishes CAD, BOM, SIM, FW, SW and POL. Availability: ToddlerBot diy build, UBTech Walker S (S1 / S2) buy.
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Side by side
■ rows differ| Field | Stanford UniversityStanford ToddlerBot | UBTech RoboticsUBTech Walker S (S1 / S2) | Δ first − second |
|---|---|---|---|
| Identity | |||
| Maker (differs) | Stanford University | UBTech Robotics | |
| Class | Humanoid | Humanoid | |
| Status (differs) | Research | Active | |
| Availability (differs) | DIY build | Buy | |
| Country (differs) | United States | China | |
| Year (differs) | 2025 | 2023 | |
| Specifications | |||
| Height | 56cm | —unsourced | |
| Mass | 3.4kg | —unsourced | |
| Degrees of freedom | 30 | —unsourced | |
| Payload (differs) | 1.48kg | 15kg | −13.52 kg (-90%) |
| Top speed | —unsourced | —unsourced | |
| Runtime | —unsourced | —unsourced | |
| Battery capacity | —unsourced | —unsourced | |
| Price | —unsourced | —unsourced | |
| Actuators (differs) | servo actuators; 7 DOF/arm, 6 DOF/leg, 2 neck, 2 waist | Servo joints with force feedback | |
| Compute (differs) | NVIDIA Jetson Orin NX 16GB | BrainNet 2.0 + Co-Agent (UBTech software) | |
| Sensors | —unsourced | RGB binocular stereo vision (S2) | |
| Openness and provenance | |||
| Openness bar | |||
| Openness score (differs) | 100/ 100 | 0/ 100 | +100 |
| CAD (25) (differs) | public | not public | |
| Bill of materials (20) (differs) | public | not public | |
| Sim model (URDF/MJCF) (20) (differs) | public | not public | |
| Firmware (15) (differs) | public | not public | |
| Software (10) (differs) | public | not public | |
| Trained policies (10) (differs) | public | not public | |
| Verification level (differs) | L2 | L0 | |
| Sources | 3 | 3 | |
| Last checked (differs) | 2026-09-25 | 2026-09-24 | |
A dash is an unsourced figure, not zero. Sources for each robot are listed on its spec sheet: ToddlerBot, UBTech Walker S (S1 / S2).
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