# Litter-Robot 4 vs PetSafe ScoopFree Crystal Smart: specs and price compared

A sourced, side-by-side comparison of the Litter-Robot 4 (Whisker) and PetSafe ScoopFree Crystal Smart (PetSafe) among self cleaning litter boxes. PetSafe ScoopFree Crystal Smart is the cheaper of the two at $269.99.

## Side by side

| Spec | Litter-Robot 4 | PetSafe ScoopFree Crystal Smart |
| --- | --- | --- |
| US price | $699 | $269.99 |
| 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 | Yes | Yes |
| Weight sensor | Yes | No |
| Litter type | clumping | crystal |
| Dimensions (in) | 22 x 27 x 29.5 in | 27.6 x 19.1 x 15.6 in |

## Key differences

- Mechanism: Litter-Robot 4 rotating vs PetSafe ScoopFree Crystal Smart raking
- Weight sensor: Litter-Robot 4 Yes vs PetSafe ScoopFree Crystal Smart No
- Litter type: Litter-Robot 4 clumping vs PetSafe ScoopFree Crystal Smart crystal
- Dimensions (in): Litter-Robot 4 22 x 27 x 29.5 in vs PetSafe ScoopFree Crystal Smart 27.6 x 19.1 x 15.6 in

## What reviewers say

**Litter-Robot 4** — Two whitelisted hands-on testers (Engadget, USA Today's Reviewed) rate the Litter-Robot 4 the best self-cleaning litter box despite its ~$699 price. Both praise near-silent operation and the companion app; both flag cat-sensor quirks and the high price. Engadget flags litter tracking; Reviewed flags the short one-year warranty and ongoing odor-filter replacement cost. All six quotes were verified as literal substrings of the fetched review text. (2 sourced reviews.)

## Sources

- Litter-Robot 4: https://www.whisker.com/litter-robot-4 (whisker.com, verified 2026-06-19)
- PetSafe ScoopFree Crystal Smart: https://www.petsafe.com/p/smart-self-cleaning-litter-box-scoopfree/PAL00-16807/ (petsafe.com, verified 2026-06-19)

Canonical: https://frontdeskreview.com/gear/self-cleaning-litter-boxes/litter-robot-4-vs-petsafe-scoopfree-crystal-smart/
Cite: Per The Front Desk Review, Litter-Robot 4 ($699) vs PetSafe ScoopFree Crystal Smart ($269.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/self-cleaning-litter-boxes/litter-robot-4-vs-petsafe-scoopfree-crystal-smart/
License: CC BY 4.0.