Check room and cat access
Compare entry height, chamber design and operating clearance. Follow the exact model instructions for cat eligibility and introduction.
Automatic cat litter boxes.
A useful litter box fits your cat, your space and your cleaning routine.
Start with access, compatible litter and the maintenance routine. Compare documented limits for the exact model; a feature list alone does not establish suitability.
Plan litter and cleaning
Confirm compatible litter, waste handling and removable parts. Chamber volume is not the same as litter fill capacity.
Understand controls and costs
Check local controls, connectivity, subscriptions and consumables. Separate documented features from promises about performance.
The reviewed models
2 published reviewsExplore automatic cat litter boxes.
Automatic cat litter boxes
PETKIT PUROBOT MAX 3
P9906 covered-cylinder litter cleaning with a low entrance, two sifting screens and coated-pad care requirements.
Product reviewRead profile
Automatic cat litter boxes
Whisker Litter-Robot 4
Covered rotating litter cleaning with local controls, optional connected tracking and component-specific maintenance.
Product reviewRead profile
Compare the key differences.
Use the model reviews for context, current buying options and the full care instructions.
Open the model comparison 2 models · 8 practical criteria
| Criterion | PETKIT PUROBOT MAX 3 | Whisker Litter-Robot 4 |
|---|---|---|
| Chamber design | Covered rotating cylinder and side waste bin | Covered rotating globe with lower waste drawer |
| Entry height | 8.03 inches / 204 mm, according to US listing | 15.75 × 15.75 inches; floor-to-entry 12 inches; step 6.9 inches |
| Footprint | Not verified | 22 W × 27 D × 29.5 H inches |
| Compatible litter | Maximum 12 mm length and 3 mm diameter; fill to MAX line | Clumping clay recommended; no non-clumping, loose-clumping, newspaper or wood/pine pellets |
| Litter capacity | Not verified | Not verified |
| Waste bin capacity | 7 L, according to US listing | Not verified |
| Controls & connectivity | 2.4 GHz Wi-Fi listed; physical routine controls documented. PETKIT’s generic FAQ says previous app settings continue after network loss; exact P9906 scope is not explicit. | 2.4 GHz Wi-Fi for connected features; basic automatic cleaning can operate without Wi-Fi |
| Power | Not verified | Not verified |
Compare head to head.
Litter-Robot 4 vs PETKIT Purobot MAX 3: Access, Cleaning and App Tradeoffs
Whisker Litter-Robot 4
PETKIT PUROBOT MAX 3
Choose Litter-Robot 4 for documented cleaning without Wi-Fi and optional extended tracking. Consider Purobot MAX 3 P9906 for its lower listed entrance and two sifter choices. Cat fit, cleaning and the exact accessory bundle matter more than an overall winner.
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