Very good
Best Smart Box
Whisker
Litter-Robot 4
$699
The Litter-Robot 4 is the box to beat and it knows it. Cleaning is close to flawless, the safety sensor stack is the most redundant in the category, and it runs quietly enough to sit in a bedroom. It is also the most expensive box here by a wide margin, and the value case only works if you keep it for years — which, given how well Whisker supports these, is a realistic assumption.
What we like
- Accepts ordinary kitchen bags — no consumable lock-in
- Handles cats from 3 lb up to 25 lb, the widest range in this index
- Whisker publishes a full spec sheet and sells every replaceable part
- Best parts availability and support in the category
What we don't
- Costs $200-$400 more than comparable boxes
- Large footprint at 22 x 27 in
- Carbon filters and OdorTrap packs are a recurring cost
Best for: Multi-cat homes · People who want it to just work · Bedrooms and small apartments where noise matters
Not ideal for: Tight budgets · Cats over 25 lb · Homes with no space for a 22 x 27 in footprint