Best Self Cleaning Litter Boxes · head-to-head
Litter-Robot 4 vs PetSafe ScoopFree Crystal Smart
A sourced, side-by-side spec comparison. PetSafe ScoopFree Crystal Smart is cheaper at $219.99. Every spec and price links to its source.
Side by side
| Litter-Robot 4 | PetSafe ScoopFree Crystal Smart | |
|---|---|---|
| US price | $699 (MSRP 'as low as $699', base unit (whisker.com)) | $219.99 (MSRP per petsafe.com (front-entry/covered model)) |
| Brand | Whisker | PetSafe |
| Released | 2022 | 2020 |
| mechanism | rotating | raking |
| capacity cats | 4 | — |
| waste drawer capacity | 8–13 gal liner (approx. 30–49 L) | — |
| app connectivity | true | true |
| weight sensor | true | false |
| litter type | clumping | crystal |
| dimensions in | 22 x 27 x 29.5 in | 27.6 x 19.1 x 15.6 in |
| release | 2022 | 2020 |
Sources — Litter-Robot 4: whisker.com (verified 2026-06-19). PetSafe ScoopFree Crystal Smart: petsafe.com (verified 2026-06-19).