Fourier N1 vs Kepler Forerunner K2 "Bumblebee"
Generated from the registry · revision 2026-09-26 · openness out of 100
Fourier N1 is 45 cm shorter (130 vs 175 cm) and 37 kg lighter (38 vs 75 kg) than Kepler Forerunner K2 "Bumblebee". Fourier N1 has 29 fewer degrees of freedom (23 vs 52) than Kepler Forerunner K2 "Bumblebee". Openness score: Fourier N1 85, Kepler Forerunner K2 "Bumblebee" 0 (of 100); only Fourier N1 publishes CAD, BOM, SIM, SW and POL. Availability for both: buy.
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Side by side
■ rows differ| Field | Fourier (Fourier Intelligence)Fourier N1 | Kepler Robotics (Shanghai Kepler Exploration Robot Co.)Kepler Forerunner K2 "Bumblebee" | Δ first − second |
|---|---|---|---|
| Identity | |||
| Maker (differs) | Fourier (Fourier Intelligence) | Kepler Robotics (Shanghai Kepler Exploration Robot Co.) | |
| Class | Humanoid | Humanoid | |
| Status | Active | Active | |
| Availability | Buy | Buy | |
| Country | China | China | |
| Year (differs) | 2025 | 2024 | |
| Specifications | |||
| Height (differs) | 130cm | 175cm | −45 cm (-26%) |
| Mass (differs) | 38kg | 75kg | −37 kg (-49%) |
| Degrees of freedom (differs) | 23 | 52 | −29 (-56%) |
| Payload | —unsourced | 30kg | |
| Top speed | 3.5m/s | —unsourced | |
| Runtime (differs) | 120min | 480min | −360 min (-75%) |
| Battery capacity | —unsourced | 2,330Wh | |
| Price | —unsourced | 30,000USD | |
| Actuators (differs) | Fourier FSA actuators; URDF effort limits 95 N·m x4, 54 N·m x7, 30 N·m x12 | Hybrid roller-screw linear + rotary actuators | |
| Compute | —unsourced | 100 TOPS onboard | |
| Sensors | —unsourced | 80+ integrated sensors; tactile dexterous hands | |
| Openness and provenance | |||
| Openness bar | |||
| Openness score (differs) | 85/ 100 | 0/ 100 | +85 |
| 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) | not public | not public | |
| Software (10) (differs) | public | not public | |
| Trained policies (10) (differs) | public | not public | |
| Verification level (differs) | L2 | L0 | |
| Sources (differs) | 8 | 2 | |
| 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: Fourier N1, Kepler Forerunner K2 "Bumblebee".
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