Our verdict
Pick the Neakasa M1 Plus if your cats are large or dislike hooded boxes; it takes cats from 3.3 to 33 lb and needs no odor packs. Pick the Litter-Robot 4 if you have up to four cats and want an enclosed globe with weight tracking.
The central trade-off
Design. The M1 Plus has an open litter bed; the Litter-Robot 4 is an enclosed globe that contains scatter and odor.
Cats. Neakasa states up to 3 cats from 3.3 to 33 lb; Whisker states up to 4 cats of at least 3 lb.
Consumables. The M1 Plus uses a brush-strip seal instead of carbon packs; the Litter-Robot uses OdorTrap packs, carbon filters and drawer liners.
Side by side
| Specification | Neakasa M1 Plus | Whisker Litter-Robot 4 |
|---|---|---|
| Cats (maker) | 3 cats | 4 cats |
| Cat weight (maker) | cats from 3.3–33 lbs | 3 lbs |
| Litter (maker) | Not stated by the maker | clumping litter |
| Waste bin lasts (maker) | 7–14 days | Not stated by the maker |
| Noise (maker) | Not stated by the maker | Not stated by the maker |
| Dimensions | 22"L x 20"W x 26"H | 24"L x 24"W x 31"H |
| Weight | 22 pounds | 24 pounds |
| Warranty | 2 Year | WhiskerCare |
Values are the makers' published specifications. "Not stated" means the maker doesn't publish it.
Which should you choose?
Choose the Neakasa M1 Plus if
- Your cats are large or wary of hoods
- You want no odor packs to buy
- Up to 3 cats
Choose the Whisker Litter-Robot 4 if
- You have up to 4 cats
- You want an enclosed box
- You want per-cat weight tracking