# Stretch 4 vs RB-Y1

- [Stretch 4](https://vuntum.com/en/robots/hello-robot-stretch-4) · [RB-Y1](https://vuntum.com/en/robots/rainbow-rb-y1)
- Last verified: 2026-10-02

| Criterion | Stretch 4 | RB-Y1 |
|---|---|---|
| Height | 1.6 m (manufacturer statement, Hello Robot (pages produit officielles)) | 1.4 m (manufacturer statement, Rainbow Robotics (pages produit officielles)) |
| Weight | 46 kg (manufacturer statement, Hello Robot (pages produit officielles)) | 170 kg (manufacturer statement, Rainbow Robotics (pages produit officielles)) |
| Payload | 4 kg (manufacturer statement, Hello Robot (pages produit officielles)) | 3 kg (manufacturer statement, Rainbow Robotics (pages produit officielles)) |
| Autonomous navigation | Yes (manufacturer statement, Hello Robot (pages produit officielles)) | Not disclosed |
| Camera | Yes (manufacturer statement, Hello Robot (pages produit officielles)) | Not disclosed |
| Teleoperation supported | Yes (manufacturer statement, Hello Robot (pages produit officielles)) | Yes (manufacturer statement, Rainbow Robotics (pages produit officielles)) |
| Public SDK | Yes (manufacturer statement, Hello Robot (pages produit officielles)) | Yes (manufacturer statement, Rainbow Robotics (pages produit officielles)) |

“Not disclosed” means no information, not “no”. A level of evidence comes with every value.

## Frequently asked questions

### On which criteria can Stretch 4 and RB-Y1 be compared?

On 4 criteria documented for both robots and measured the same way: height, weight, teleoperation supported and public sdk.

### Who makes Stretch 4 and RB-Y1?

Stretch 4 is made by Hello Robot, RB-Y1 by Rainbow Robotics.

### Where do the values in this comparison come from?

Every value links to a claim on the robot’s sheet, with its source, its level of evidence and the date it was verified. “Not disclosed” means that no validated source gives the value, never “no”.

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