Whisker
Litter-Robot 4
Ranked #1 of 3 in Best Self-Cleaning Litter Box
Best for large or multiple cats
From $699Approximate — prices change and we do not track them in real time
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Key specifications
- Waste drawer capacity
- 637 cubic inches (~20% more than Litter-Robot 3)
- Entryway width
- 15.75 in — accommodates cats up to 25 lbs
- Dimensions
- 22 in L x 29 in W x 30 in H
- Weight (empty)
- 24 lbs
- Control
- WiFi + app, adjustable cleaning-cycle delay via weight sensor
Our verdict
The Litter-Robot 4's whole case is capacity: a 637 cubic-inch waste drawer — 20% more than the previous generation — and a 15.75-inch entryway wide enough for Maine Coons and other large breeds. That's the difference between emptying the bin every few days versus every week or two in a multi-cat home. The tradeoff is size and price: at 29 inches tall it needs real floor space, and $699 (plus $100 for the extended warranty most owners add) makes it the most expensive box in this comparison by a wide margin.
How it scores
Each criterion is scored 0-100 from published specs and lab-tested figures in the sources below, then weighted by the fixed formula this category uses. The weights are the same for every product here.
Automation30% of score
90
Capacity25% of score
92
Maintenance Ease20% of score
80
Price Value25% of score
55
Strengths and limitations
Pros
- Largest waste drawer in this comparison at 637 cubic inches, meaning fewer trips to empty it
- 15.75-inch entryway accommodates large breeds like Maine Coons up to 25 lbs
- Uses standard clumping litter rather than a proprietary consumable
Cons
- At $699 (plus $100 for the extended warranty most owners add), the most expensive box in this comparison
- 29 inches tall and requires real floor space — not a fit for tight apartments
- Its size can make it difficult to find a spot for in a crowded home
Where this product appears
Also worth a look
Sources: Petful (Litter-Robot 4 review) (2026) · LitterBoxLab (Litter-Robot 4 review) (2026)Last checked by Picksights 2026-07-29