Kepler Forerunner K2 vs Fourier GR-3
Compare Kepler Forerunner K2 (Kepler Robotics) and Fourier GR-3 (Fourier) side by side: degrees of freedom, weight, payload, battery life, actuators, and status.
| Spec | Kepler Forerunner K2 | Fourier GR-3 |
|---|---|---|
| Manufacturer | Kepler Robotics | Fourier |
| Category | Humanoid | Humanoid |
| Country | China | China |
| Degrees of freedom | 40 | 43 |
| Weight (kg) | 85 | 71 |
| Battery life (h) | 4 | 3 |
| Payload | 25 kg | About 3 kg per arm |
| Max speed | 1.5 m/s | 6.1 km/h |
| Actuators | Fourier actuators (peak joint torque 440 N·m) | |
| Primary sensor | Monocular camera + 6-axis IMU | |
| Function | Assembly & manufacturing | Healthcare & assistance |
| Released | 2024 | 2025 |
| Status | Testing | Active |
Verdict
Kepler Forerunner K2 leads on 2 of the 4 weighted dimensions both makers disclose.
Kepler Forerunner K2 leads on payload (25 kg vs About 3 kg per arm) and battery life (4 h vs 3 h).
Fourier GR-3 leads on degrees of freedom (43 vs 40) and max speed (6.1 km/h vs 1.5 m/s).
Left out because at least one manufacturer does not publish a figure: price.
Kepler Forerunner K2
Kepler Forerunner K2, from Kepler Robotics. No maker specification sheet is on file, so no dimensions, price or performance figures are listed.
Fourier GR-3
Fourier's first “care-bot” humanoid, designed for interactive companionship with soft covering materials and a moderate height. About 71 kg and 164 cm, with a hot-swappable battery and about 3 h runtime per Fourier's developer documentation.