Whisker
Litter-Robot 4
$699
Released 2022
Best Self Cleaning Litter Boxes · head-to-head
Litter-Robot 4 vs PetSafe ScoopFree Crystal Smart
A sourced, side-by-side comparison. PetSafe ScoopFree Crystal Smart is cheaper at $269.99. Every spec and price links to its source.
PetSafe
PetSafe ScoopFree Crystal Smart
$269.99Cheaper
Released 2020
Which is better: the Litter-Robot 4 or PetSafe ScoopFree Crystal Smart?
On the specs we track, they're closely matched. The PetSafe ScoopFree Crystal Smart is the cheaper at $269.99.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| 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 |
| Release | 2022 | 2020 |
Sources — Litter-Robot 4: whisker.com (verified 2026-06-19). PetSafe ScoopFree Crystal Smart: petsafe.com (verified 2026-06-19).
What's the difference between the Litter-Robot 4 and PetSafe ScoopFree Crystal Smart?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Mechanism: Litter-Robot 4 rotating vs PetSafe ScoopFree Crystal Smart raking
- Weight sensor: Litter-Robot 4 true vs PetSafe ScoopFree Crystal Smart false
- 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
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
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, 2 lab-tested.)
Praised: Near-silent operation; Helpful app with litter/waste alerts and cat activity + weight tracking; Strong odor control, no detectable smell.
Flagged: Very high ~$699 price; Cat-detection sensor faults / reliability quirks; Litter gets tracked onto the floor (open design).
PetSafe ScoopFree Crystal Smart
No sourced tester review yet.