K-Scale Z-Bot (Zeroth Bot) vs ROBOTIS OP3
Generated from the registry · revision 2026-09-26 · openness out of 100
Z-Bot (Zeroth Bot) is 5 cm shorter (46 vs 51 cm) than ROBOTIS OP3. Z-Bot (Zeroth Bot) has 2 fewer degrees of freedom (18 vs 20) than ROBOTIS OP3. Openness score: Z-Bot (Zeroth Bot) 90, ROBOTIS OP3 45 (of 100); only Z-Bot (Zeroth Bot) publishes CAD and BOM. Availability: Z-Bot (Zeroth Bot) diy build, ROBOTIS OP3 buy.
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Side by side
■ rows differ| Field | K-Scale LabsK-Scale Z-Bot (Zeroth Bot) | ROBOTISROBOTIS OP3 | Δ first − second |
|---|---|---|---|
| Identity | |||
| Maker (differs) | K-Scale Labs | ROBOTIS | |
| Class | Humanoid | Humanoid | |
| Status (differs) | Orphaned | Active | |
| Availability (differs) | DIY build | Buy | |
| Country (differs) | United States | South Korea | |
| Year | 2025 | —unsourced | |
| Specifications | |||
| Height (differs) | 46cm | 51cm | −5 cm (-10%) |
| Mass | —unsourced | 3.5kg | |
| Degrees of freedom (differs) | 18 | 20 | −2 (-10%) |
| Payload | —unsourced | —unsourced | |
| Top speed | —unsourced | —unsourced | |
| Runtime | —unsourced | —unsourced | |
| Battery capacity | —unsourced | 36.6Wh | |
| Price | 999USD | —unsourced | |
| Actuators (differs) | 18 servo motors | 20x Dynamixel XM430-W350-R | |
| Compute | —unsourced | Intel NUC i3, 8GB RAM | |
| Sensors (differs) | cameras, IMU (per press) | Logitech C920 camera, 9-axis IMU | |
| Openness and provenance | |||
| Openness bar | |||
| Openness score (differs) | 90/ 100 | 45/ 100 | +45 |
| CAD (25) (differs) | public | not public | |
| Bill of materials (20) (differs) | public | not public | |
| Sim model (URDF/MJCF) (20) | public | public | |
| Firmware (15) | public | public | |
| Software (10) | public | public | |
| Trained policies (10) | not public | not public | |
| Verification level (differs) | L1 | L2 | |
| Sources (differs) | 3 | 2 | |
| Last checked | 2026-09-24 | 2026-09-24 | |
A dash is an unsourced figure, not zero. Sources for each robot are listed on its spec sheet: Z-Bot (Zeroth Bot), ROBOTIS OP3.
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