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Best Self-Cleaning Litter Boxes: Litter-Robot Compared
This list is for cat owners weighing three self-cleaning litter boxes from the same brand. The picks are compared on the product details listed (cat weight range, number of cats, headroom, waste drawer size) and on price. Details are as listed by the merchant, so check the current listing before you buy.
Last updated November 8, 2026. How these were picked: from product details and prices published by retailers. We don't claim hands-on testing.
Litter-Robot 5
Litter-Robot 5: Largest Range and Drawer
Best for: Big cats or homes with several cats
- Fits cats from 3 to 30 lbs and is listed for up to 5 cats.
- Has 17.5 inches of interior headroom, the most of the three.
- Comes with an extra-large waste drawer and WasteID, which identifies urine versus feces.
Check before buying: At $799 it is the highest-priced of these three, and the size specs aren't listed here.
$799.00 price when listed
Check price at Whisker →Litter-Robot EVO
Litter-Robot EVO: Lowest Price, Smaller Capacity
Best for: One or two average-size cats on a smaller budget
- At $599, it costs the least of the three.
- Listed for cats 3 to 19 lbs and up to 2 cats.
- Weighs 21.5 lbs empty, with a 20.6 by 24.3 inch footprint.
Check before buying: Medium waste drawer, 14.5 inch headroom and a 19 lb limit may not suit larger cats.
$599.00 price when listed
Check price at Whisker →Litter-Robot 4
Litter-Robot 4: The Middle Option
Best for: Three or four cats, or a cat over 19 lbs
- Fits cats from 3 to 25 lbs and is listed for up to 4 cats.
- Has a large waste drawer and 16.5 inches of headroom.
- Entryway measures 15.75 by 15.75 inches.
Check before buying: Its footprint is 22 by 27 inches and it weighs 24 lbs empty. Measure your space first.
$699.00 price when listed
Check price at Whisker →Bottom line
The Litter-Robot EVO suits one or two average-size cats and a tighter budget. The Litter-Robot 4 fits bigger households, and the Litter-Robot 5 is the pick for the largest cats, the most cats, and the added WasteID feature.
Questions
Which of these fits the biggest cats?
The Litter-Robot 5 is listed for cats up to 30 lbs. The Litter-Robot 4 goes up to 25 lbs, and the EVO up to 19 lbs.
How many cats can each one handle?
The Litter-Robot 5 is listed for up to 5 cats, the Litter-Robot 4 for up to 4, and the EVO for up to 2.
What does WasteID do?
Per the listing, WasteID on the Litter-Robot 5 identifies urine versus feces. The other two listings don't mention it.
Which one takes up the least floor space?
The EVO lists a 20.6 by 24.3 inch footprint, smaller than the Litter-Robot 4 at 22 by 27 inches. No footprint is listed for the Litter-Robot 5.
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