Key specs
- Category
- Self cleaning litter box
- Cats supported
- Up to 4
- Trial
- 90 days
- Independent rating
- Consumer Reports Editor's Choice (April 2025)
- Launched
- 2022
- Minimum cat weight
- 3 lb
- Waste drawer
- About 8 days for one cat (Whisker)
- WasteID
- No
- Cameras
- No
- Carpet
- Needs Carpet Tray add-on
- Mechanism
- Rotating globe that sifts clumps
- Sensors
- Weight scale plus entry sensor
- App
- Yes, Whisker app with visit and weight tracking
Our verdict
The Litter-Robot 4 is the safe choice. It is not cheap and it needs floor space, but no other self cleaning litter box has as much independent and owner evidence behind it. The 90-day trial lowers the risk if your cat refuses it.
What we like
- Large base of owner reviews
- App tracks visits and cat weight
- Consumer Reports Editor's Choice (April 2025)
- Largest owner review base: 9,471 reviews at 87% positive on Whisker's store (Oct 2026)
- Compatible with the LitterHopper accessory
- Refurbished units sold by Whisker, seen at $599 (Oct 2026)
What to know
- Bulky
- Proprietary liners add running costs
- Consumer Reports measured about 22 inches wide by 27 inches deep
- Status shown with light bar codes rather than a screen
- No waste-type detection
How it compares
| Spec | Litter-Robot 4 | PETLIBRO Luma | Litter-Robot 5 | Litter-Robot EVO |
|---|---|---|---|---|
| Price | around $699 / £699 | around $599.99 / £699.99 | around $799 / £899 | around $599 |
| Category | Self cleaning litter box | - | - | - |
| Cats supported | Up to 4 | - | Up to 5 | Up to 2 |
| Trial | 90 days | - | - | - |
| Independent rating | Consumer Reports Editor's Choice (April 2025) | - | - | - |
| Launched | 2022 | - | Late 2025 | Late 2025 |
| Minimum cat weight | 3 lb | - | - | - |
| Waste drawer | About 8 days for one cat (Whisker) | 11 L (about 7 days for 2 cats, per PETLIBRO) | About 10 days for one cat (Whisker) | - |
| WasteID | No | - | Yes | No |
Open these in the compare tool ›
Price drop alertWe will email you when the Litter-Robot 4 drops in price. One email per drop, unsubscribe any time.
Featured in our guides
Home Robot GuideHome robots compared: vacuums, mowers, litter boxes, companion robots and humanoid helpers. What each costs, what works Litter Robot ReviewLitter Robot review for 2026: Litter-Robot 4, 5, 5 Pro and EVO compared on price, cat size, cameras, running costs and oBest Self Cleaning Litter BoxThe best self cleaning litter box for your cat and budget, from the Litter-Robot 4 to camera models and a $99 pick. Pric
