The previous-generation Litter-Robot — the same proven rotating mechanism at a lower price than the 4.
| Min. cat weight | 2.3 kg |
| Litter type | Clumping |
| Waste capacity | 5 L |
| App control | Yes |
| Health monitoring | No |
| Safety sensor | Yes |
| Odor control | Yes |
| Multi-cat | Yes |
Each dimension is scored 0–10 from public specs and weighted into the overall rating.