Whisker
Whisker Litter-Robot 4
$699
Released 2022
Best Self Cleaning Litter Boxes · head-to-head
Whisker Litter-Robot 4 vs PETKIT PuraMax 2
A sourced, side-by-side comparison. PETKIT PuraMax 2 is cheaper at $369.99. Every spec and price links to its source.
PETKIT
PETKIT PuraMax 2
$369.99Cheaper
Released 2024
Which is better: the Whisker Litter-Robot 4 or PETKIT PuraMax 2?
On the specs we track, they're closely matched. The PETKIT PuraMax 2 is the cheaper at $369.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Whisker Litter-Robot 4 | PETKIT PuraMax 2 |
|---|---|---|
| US price | $699 | $369.99 |
| Brand | Whisker | PETKIT |
| Released | 2022 | 2024 |
| Mechanism | rotating | rotating |
| Capacity cats | 4 | — |
| Waste drawer capacity | 8–13 gal liner (approx. 30–49 L) | 7 L |
| App connectivity | Yes | Yes |
| Weight sensor | Yes | Yes |
| Litter type | clumping | clumping |
| Dimensions (in) | 22 x 27 x 29.5 in | 24.41 x 21.18 x 21.73 in |
| Release | 2022 | 2024 |
Sources — Whisker Litter-Robot 4: whisker.com (verified 2026-09-21). PETKIT PuraMax 2: petkit.com (verified 2026-06-19).
What's the difference between the Whisker Litter-Robot 4 and PETKIT PuraMax 2?
Where the two actually differ on the specs we track (2 of 7). Matching specs are omitted.
- Waste drawer capacity: Whisker Litter-Robot 4 8–13 gal liner (approx. 30–49 L) vs PETKIT PuraMax 2 7 L
- Dimensions (in): Whisker Litter-Robot 4 22 x 27 x 29.5 in vs PETKIT PuraMax 2 24.41 x 21.18 x 21.73 in
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Whisker 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).
PETKIT PuraMax 2
Only one testing outlet (Cats.com) has reviewed the PetKit Pura Max 2 so far, and its verdict is mixed. The reviewer credits it for odor elimination, safety, and its leak-proof liner, but reports that it emptied waste more poorly and slowly than any other automatic litter box tested, and found it hard to deep clean given its price. (1 sourced review, 1 lab-tested.)
Praised: Effective odor elimination; Safety features, including an entrance that stays open for the cat; Leak-proof liner design.
Flagged: Emptying performance was worse and slower than other automatic litter boxes tested; Difficult to deep clean for the price.