Rh-1 vs Kojiro vs CB2 (Child-robot with Biomimetic Body)

Measure	Rh-1	Kojiro	No public photo yetWe only show photos we're allowed to useCB2 (Child-robot with Biomimetic Body)
Maker	Universidad Carlos III de Madrid (RoboticsLab)	University of Tokyo JSK Lab	Osaka University
Country	Spain	Japan	Japan
Status	Retired	Retired	Retired
First shown	2007	2007	2006
Released	—	—	—
Price	—	—	—
Height	130 cm	135 cm	130 cm
Weight	50 kg	45 kg	33 kg
Top speed	—	—	—
Payload	—	—	—
Battery	0.5 h	—	—
Joints (DoF)	21	—	—
Moves on	Legs	Legs	Legs
Hands	simple	simple	simple
Built for	research	research	research
Units built or sold	—	1 research prototype · not sold	Not stated (research prototype) · Not sold; research robot

Figures are what makers or the press published; “—” means not published. Each robot's profile links to its sources.

Popular comparisons

Well-known robots paired only when they move the same way, are at the same stage and share a main job. How we choose

• Digit 5 vs Optimus Gen 2
• Optimus Gen 2 vs IRON (next generation)
• Atlas (product version) vs Figure 03
• Apollo 2 vs Figure 03
• NEO (home robot) vs Figure 03
• Apollo 2 vs Atlas (product version)
• Digit 5 vs IRON (next generation)
• Unitree Dual-Arm Humanoid (R1-A5 / R1-A7 / R1-A5-D / R1-A7-D) vs D1
• Feather vs Unitree Dual-Arm Humanoid (R1-A5 / R1-A7 / R1-A5-D / R1-A7-D)
• AI Worker vs Unitree Dual-Arm Humanoid (R1-A5 / R1-A7 / R1-A5-D / R1-A7-D)
• Galbot S1 vs Unitree Dual-Arm Humanoid (R1-A5 / R1-A7 / R1-A5-D / R1-A7-D)
• MagicBot D1 vs Unitree Dual-Arm Humanoid (R1-A5 / R1-A7 / R1-A5-D / R1-A7-D)

How comparisons are chosen

Every robot page, the suggestions above and the popular list follow the same rules, so a comparison is never a random pick. You can still compare any two robots yourself with the menus at the top.

1. Like with like. Humanoids are compared with humanoids, and a machine only with its own type: a robot dog with robot dogs.
2. Another maker. A maker’s own models are listed on its page instead.
3. Moves the same way. Walking robots with walking robots, wheeled with wheeled, fixed upper bodies with fixed upper bodies.
4. Same stage. Robots on sale or in pilots with each other; prototypes with prototypes; research platforms with research platforms; past robots with robots of their time.
5. A shared main job. At least one job in common, such as factory work, retail or care. Broad labels like research, education or general-purpose only count when a robot has nothing more specific.
6. Close in time, size and price. First shown within two years, in the same size class (full size from 150 cm, mid size 100 to 149 cm, small under 100 cm) and priced within three times of each other when both prices are published. If fewer than two robots pass, these three are relaxed and the page says the matches are the nearest ones.

Under each peer’s name, the page lists which of these it shares. Closer size and price, and more jobs in common, put a robot higher in the list.