Whisker Litter-Robot 4
Automatic litter box: the maker’s published limits, with the page each was read from. Litter robots are judged against your house on the guides below.
Product links on this page will be affiliate links when the site goes live; they do not change which units are picked. How that works.
Amazon listing verified as the bare unit at $699 on September 17, 2026; the link goes live with the site.
The limits the maker publishes
Every figure below was read from the maker’s page or manual, and the link beside it goes there. A limit the maker does not publish is absent, never guessed.
| Limit | Maker figure | Read from |
|---|---|---|
| Cats, up to | 4 | source |
| Cat weight, from | 3 lb | source |
| Cat weight, to | 25 lb | source |
| Drawer lasts, one cat | 8 days | source |
| Entry height | 15.8 in | source |
| Litter | clumping | source |
| Warranty | 1 year | source |
| App | yes | source |
| Safety sensors | SafeCat System with Omnisense Detection: multi-layer safety system of lasers, weight sensors, and anti-obstruction technology | source |
| Width | 22 in | source |
| Depth | 27 in | source |
| Height | 29.5 in | source |
| Subscription required | no | source |
Recall screen: no published CPSC recall names this exact model (screened 2026-09-17) (how we screen).
Living with it
What the maker’s own pages and manual say about owning this unit, and what owners report in public. Each line links to where it was read.
- Consumables
- Whisker recommends replacing the Carbon Filter and OdorTrap Packs every 2-4 weeks for best odor control, depending on how many cats use the unit.whisker.com
- What consumables cost
- Whisker sells a Kickstart Kit bundling carbon filters, OdorTrap packs, waste drawer liners, GreatLitter, and cleaner wipes for a special price of $80, discounted from a stated regular price of $115.whisker.com
- Subscription
- The optional Whisker+ membership renews at $7.99 a month (or a discounted annual rate) on top of the free Whisker app, and adds features like extended activity history and video.whisker.com
- Set-up
- Whisker instructs owners to fill the globe with litter until it sits just below the raised fill line, about 8-10 lbs by weight or roughly one gallon by volume.litter-robot.com
- Maintenance
- Whisker's own care guide says the globe itself only needs a full wash every 1-3 months, beyond regular clump/waste-drawer upkeep.litter-robot.com
- Warranty
- Beyond the standard warranty, Litter-Robot 4 ships with a 90-day in-home trial, so owners can return the unit for a refund of the purchase price if it doesn't work out, paying only return shipping.whisker.com
- Support and parts
- Whisker offers phone support at 1-877-250-7729 with live agents available on extended weekday and weekend hours.litter-robot.com
- Known issue
- Whisker itself warns that translucent or white-colored litters, like crystal litter, can throw off the Litter-Robot 4's litter-level and Drawer Full Indicator readings and are not recommended.whisker.com
What owners and long-term reviewers report, from public threads and published reviews; not our own testing.
- Some owners describe having to repeatedly press the reset button on the cowling to keep the robot cycling.cats.com
- Some owners say urine can work its way under the tub/globe assembly, leaving an odor that persistent cleaning doesn't fully remove.cats.com
- Some owners worry that replacing torn liners every few months adds meaningfully to the robot's running cost.cats.com
- Owners who stick with the Litter-Robot 4 say they wouldn't go back to a conventional litter tray.catster.com
- Some owners have had their Litter-Robot 4 simply stop rotating after only about a month of regular use.cats.com
- Some owners report the unit stopped cycling within the first two months of ownership, and Whisker's fix was to send a replacement power adapter rather than a new unit.cats.com
- Some owners say the waste drawer liners tear well before they're due for replacement, forcing early swaps.cats.com
What independent testers found
We do not test units ourselves. These are figures and verdicts published by named testers, with the maker’s claim beside them where the tester gave it; where a tester relays owners’ reports rather than a measurement, the row says so.
Judged in
- The best automatic litter box for multiple cats (Rated for 4 cats, the widest weight range of the three picks)
- Litter-Robot 4 vs. PetKit vs. Neakasa (The reference: every limit published)