Kepler Forerunner K2 "Bumblebee" vs Rainbow Robotics RB-Y1
Generated from the registry · revision 2026-09-26 · openness out of 100
Kepler Forerunner K2 "Bumblebee" is 35 cm taller (175 vs 140 cm) and 56 kg lighter (75 vs 131 kg) than Rainbow Robotics RB-Y1. Kepler Forerunner K2 "Bumblebee" has 32 more degrees of freedom (52 vs 20) and 27 kg more rated payload (30 vs 3 kg) than Rainbow Robotics RB-Y1. Openness score: Kepler Forerunner K2 "Bumblebee" 0, Rainbow Robotics RB-Y1 30 (of 100); only Rainbow Robotics RB-Y1 publishes SIM and SW. Availability for both: buy.
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Side by side
■ rows differ| Field | Kepler Robotics (Shanghai Kepler Exploration Robot Co.)Kepler Forerunner K2 "Bumblebee" | Rainbow RoboticsRainbow Robotics RB-Y1 | Δ first − second |
|---|---|---|---|
| Identity | |||
| Maker (differs) | Kepler Robotics (Shanghai Kepler Exploration Robot Co.) | Rainbow Robotics | |
| Class (differs) | Humanoid | Wheeled humanoid | |
| Status | Active | Active | |
| Availability | Buy | Buy | |
| Country (differs) | China | South Korea | |
| Year | 2024 | 2024 | |
| Specifications | |||
| Height (differs) | 175cm | 140cm | +35 cm (+25%) |
| Mass (differs) | 75kg | 131kg | −56 kg (-43%) |
| Degrees of freedom (differs) | 52 | 20 | +32 (+160%) |
| Payload (differs) | 30kg | 3kg | +27 kg (+900%) |
| Top speed | —unsourced | 1.5m/s | |
| Runtime | 480min | —unsourced | |
| Battery capacity (differs) | 2,330Wh | 1,250Wh | +1,080 Wh (+86%) |
| Price | 30,000USD | —unsourced | |
| Actuators (differs) | Hybrid roller-screw linear + rotary actuators | Rainbow in-house joint modules | |
| Compute (differs) | 100 TOPS onboard | Dual-PC (real-time robot PC + user PC with ROS 2) | |
| Sensors (differs) | 80+ integrated sensors; tactile dexterous hands | Built-in wrist force/torque sensors (v1.2); optional camera | |
| Openness and provenance | |||
| Openness bar | |||
| Openness score (differs) | 0/ 100 | 30/ 100 | −30 |
| CAD (25) | not public | not public | |
| Bill of materials (20) | not public | not public | |
| Sim model (URDF/MJCF) (20) (differs) | not public | public | |
| Firmware (15) | not public | not public | |
| Software (10) (differs) | not public | public | |
| Trained policies (10) | not public | not public | |
| Verification level (differs) | L0 | L2 | |
| Sources | 2 | 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: Kepler Forerunner K2 "Bumblebee", Rainbow Robotics RB-Y1.
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