Whisker
Litter-Robot 4
$699
Released 2022
Best Self Cleaning Litter Boxes · head-to-head
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 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 | 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 — Litter-Robot 4: whisker.com (verified 2026-06-19). PETKIT PuraMax 2: petkit.com (verified 2026-06-19).
What's the difference between the 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: Litter-Robot 4 8–13 gal liner (approx. 30–49 L) vs PETKIT PuraMax 2 7 L
- Dimensions (in): 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.
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
No sourced tester review yet.