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The Litter-Robot 4 has been the benchmark self-cleaning litter box for years, while PETKIT’s Purobot line, led by the Purobot Max Pro 2 and the premium Purobot Ultra, has become its most talked-about challenger. They solve the same problem in different ways: Whisker’s rotating globe with a sifting screen and carbon-filtered drawer versus PETKIT’s open drum with AI cameras and auto-bagging waste. This comparison uses published specs, pricing and owner feedback to help you pick.
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The contenders
Litter-Robot 4 (Whisker): a globe-style box with SmartScale weight tracking, laser level sensors and a sealed drawer with a carbon filter.
PETKIT Purobot Max Pro 2: an open drum with a 1080p AI camera and 210° view, facial recognition and an 8 L auto-packing waste bin.
PETKIT Purobot Ultra: PETKIT’s flagship with a rotating camera, stool image analysis and a 10 L auto-packing bin.
Head-to-head specs
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| Feature | Litter-Robot 4 | PETKIT Purobot Max Pro 2 | PETKIT Purobot Ultra |
|---|---|---|---|
| Typical price | Varies | Varies | Varies |
| Cat weight range | 3–25 lb, up to 4 cats | 3.3–22 lb | 3.3–22 lb |
| Camera | None | 1080p, 210°, facial recognition | 1080p rotating, 210°, stool analysis |
| Waste handling | Drawer with carbon filter, bag liner | 8 L auto-packing, up to about 17 days (1 cat) | 10 L auto-packing, up to about 20 days (1 cat) |
| Entry | About 15.75 x 15.75 in | About 10.5 x 10.7 in, low entry | Low entry |
| Wi-Fi | 2.4 GHz only | 2.4 and 5 GHz | 2.4 and 5 GHz |
| Litter | Clumping clay; crystal litter not recommended | Wide compatibility listed | Wide compatibility; special litter for urine alerts |
| Size | About 29.5 in tall, 22 in wide, 27 in deep | About 25.9 x 21.2 x 23.7 in | Similar large footprint |
Specs from Whisker and PETKIT listings; prices vary with sales and bundles, so check current price.
Where Litter-Robot 4 wins
Proven track record and support
Whisker has a long history, a large owner base, reconditioned units and a strong warranty program. Replacement parts and troubleshooting guides are easy to find.
Larger cats
The Litter-Robot 4 supports cats up to 25 lb and has a large entryway, which helps with big breeds. Both Purobot models top out at about 22 lb.
No proprietary bags required
The drawer uses ordinary bags or Whisker liners, and a carbon filter handles odor. Ongoing consumable cost is typically lower than auto-packing systems that need brand-specific bags.
Where PETKIT Purobot wins
Camera and AI features
Both Purobot models include cameras with facial recognition, which help separate cats of similar weight, something scale-only systems can struggle with. The Ultra adds stool image analysis and room monitoring.
Hands-off waste disposal
Auto-packing bins seal and bag waste, so you pull out a closed bag every one to three weeks rather than emptying a drawer.
Price (Max Pro 2) and Wi-Fi
Both Purobots support 5 GHz Wi-Fi.
Which to choose
- Pick the Litter-Robot 4 for large cats, maximum reliability history, lower consumable costs and strong support.
- Pick the Purobot Max Pro 2 for camera-based cat identification and auto-bagging at a lower price, if your cats are under 22 lb.
- Pick the Purobot Ultra if you want the most health-monitoring features and a rotating room camera, and accept premium pricing and proprietary consumables.
If you want cameras from Whisker, the newer Litter-Robot 5 Pro is the more direct rival to the Ultra.
FAQ
Is PETKIT Purobot as reliable as Litter-Robot 4?
Litter-Robot 4 has a longer track record and a well-known warranty program. PETKIT’s newer models receive generally positive reviews but have less long-term ownership data. Whichever you choose, buy from a retailer with a solid return window.
Which is better for a senior cat?
Low-entry designs like the Purobot can suit cats with stiff joints, while the Litter-Robot 4’s large opening is easy to walk into. Use the app’s visit data to watch for changes, and see your vet if an older cat’s litter habits change.
Bottom line
The Litter-Robot 4 remains the dependable, large-cat-friendly standard with lower running costs; PETKIT’s Purobot models win on AI cameras and auto-bagging, with the Max Pro 2 offering strong value and the Ultra adding the most monitoring. Match the choice to your cats’ size and how much tech you want, check current price, and bring any worrying litter box changes to your vet.
