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Last updated on July 26, 2026
The PETKIT automatic litter box lineup has three models, and choosing the wrong one is easy. The PuraMax 2 is the compact entry point. The Purobot Max 3 is the mid-range option with a larger opening and better odour control. The Purobot Ultra is the flagship, with an AI camera, auto waste sealing, and the most sensors of any PETKIT box. This review covers all three so you can match the right one to your home.
The main difference between PETKIT litter boxes is size and automation: the PuraMax 2 is compact, the Max 3 adds a larger opening and better odour control, and the Ultra automates waste sealing and health tracking.
If you want to see how PETKIT compares to other brands, the best automatic litter box roundup covers the full category.
Quick Picks: PETKIT Automatic Litter Box Models
Best for Small Spaces and Single Cats: PETKIT PuraMax 2
Best for Large Cats and Odour Control: PETKIT Purobot Max 3
Best for Multi-Cat Homes and Health Tracking: PETKIT Purobot Ultra
PETKIT Automatic Litter Box Comparison
| Model | Best For | Watch Out For |
|---|---|---|
| PuraMax 2 | Small spaces, single cats, per-cat weight tracking | Drum can stick without the right delay settings |
| Purobot Max 3 | Large cats, senior cats, odour control focus | Smaller review pool than the other two |
| Purobot Ultra | Multi-cat homes, health monitoring, hands-free waste | Premium investment, some features need subscription |
PETKIT PuraMax 2 Automatic Self-Cleaning Cat Litter Box
Why It Stands Out
The PuraMax 2 is PETKIT’s most compact model and the one that fits most apartments without dominating the room. One buyer expected something large and found it reads more like a small igloo tucked in a corner. The 7.87-inch low entry was confirmed comfortable for a senior cat, even by a reviewer who was otherwise critical of the product.
Per-cat weight tracking through the app is the most praised feature, logging weight, visit frequency, and duration for each cat. The unit has 11 safety sensors and the entrance stays permanently open so a cat can never get trapped. Litter compatibility is broader than the listing suggests. Standard clumping clay and tofu litter both work without needing to buy PETKIT’s own branded litter.
Setup arrives mostly pre-assembled and takes little time to get running.
Possible Downsides
The drum can stick to waste without the right settings. The fix is simple: set a delayed cleaning cycle of around three minutes after the cat exits combined with the auto-cover setting. The Wi-Fi is 2.4GHz only, which can cause connection issues on newer routers that have moved to 5GHz.
Best For
Small spaces, single or two-cat homes, and anyone who wants detailed health tracking without a large footprint.
PETKIT Purobot Max 3 Self-Cleaning Cat Litter Box
Why It Stands Out
The Max 3’s main advantage is the larger 10.5-inch opening, marketed specifically for overweight, senior, short-legged, and mobility-impaired cats. That’s a meaningful upgrade over the PuraMax 2’s entry size. The semi-enclosed design adds a layer of odour containment the open-top PuraMax 2 can’t match.
It comes with two sifter attachments: one for clay and one for tofu, so you don’t need to switch litter types to use it. A shared-access app feature lets multiple household members monitor the box, which isn’t available on the other two models. Waste covering is a dedicated automated mode here rather than a manual step. No subscription required, unlike the Ultra.
Possible Downsides
The review pool is smaller than the PuraMax 2 or Ultra, so long-term performance data is limited. If you don’t need the larger opening or semi-enclosed design, the PuraMax 2 covers most of the same features.
Best For
Large cats, senior cats with mobility limitations, and households that want semi-enclosed odour containment without the Ultra’s feature set.
PETKIT Purobot Ultra Automatic Self-Cleaning Cat Litter Box
Why It Stands Out
Auto waste packing is the feature that sets the Ultra apart. When the waste bin fills, the unit heat-seals the bag and loads a new one automatically. You never touch the waste directly, and this works reliably even in multi-cat homes with frequent use.
The AI camera tracks litter box activity and flags changes in stool shape, urine clump size, and visit patterns. Three owners with specific medical situations, including a diabetic cat and a cat with kidney disease, cite health monitoring as their main reason for buying. The rotating dual-view camera captures more than the fixed camera on the Max 3.
Odour control is consistently strong with no negative reports. The sealed waste door is specifically credited with eliminating smell that other boxes couldn’t contain. The Ultra runs on dual-band 5GHz Wi-Fi, which avoids the connection issues seen on the 2.4GHz-only PuraMax 2. It has 20 safety sensors, nearly double the PuraMax 2.
Possible Downsides
Some app features are gated behind a subscription based on independent owner reports. Worth factoring in before buying. The Ultra is also the largest PETKIT box, so space matters more here. Some large cats have been reluctant to go fully inside the chamber, using the box area but avoiding the interior.
Best For
Multi-cat homes, cats with health conditions where monitoring matters, and anyone who wants fully hands-free waste handling.
Which PETKIT Should You Buy?
One or two cats, small space: the PuraMax 2 covers the basics well. Set the delayed cleaning cycle on first use and you’ll avoid the drum-sticking issue most complaints mention.
Large or senior cat: the Purobot Max 3 has the largest opening in the lineup and the semi-enclosed design keeps odour more contained. No subscription required.
Multi-cat home or a cat with health conditions: the Purobot Ultra is the only one with auto waste sealing and a rotating AI camera. Factor in the potential subscription cost before committing.
What litter to use: all three work with standard clumping clay. The Max 3 and Ultra include sifter attachments for tofu litter. You don’t need PETKIT’s own branded litter for any of them. For a broader look at what works best in automatic boxes, the best clumping cat litter guide covers your options.
Frequently Asked Questions
How loud is the PETKIT automatic litter box?
The PuraMax 2 is consistently described as whisper-quiet, with one skittish cat treating it as a bed on day one. The Ultra’s sideways drum rotation is quieter and cleaner than the PuraMax 2’s vertical design. The Max 3 has no noise complaints in its review pool.
Does the PETKIT app work well?
On the Ultra, the app is described as clean, intuitive, and highly customisable. The PuraMax 2’s app works well for tracking but the 2.4GHz Wi-Fi can cause connection issues on newer routers. The Max 3 adds shared access for multiple household members, which the other two lack.
Does the Purobot Ultra require a subscription?
Some features are gated behind a subscription based on independent owner reports. The Max 3 has no subscription mentioned in its listing, making it the cleaner choice if you want all features without ongoing fees. If you’re transitioning a cat to any of these models, the guide on getting your cat to use an automatic litter box walks through the full introduction process.
Can PETKIT litter boxes handle multiple cats?
The Ultra is the strongest multi-cat option, with auto waste sealing, a larger bin, and cat facial recognition for tracking individuals. The PuraMax 2 and Max 3 work for two to three cats but have smaller bins. For four or more cats, the Ultra or the Meowant 106L is a better fit.
What litter works in PETKIT automatic litter boxes?
Standard unscented clumping clay works across all three. The Max 3 and Ultra include sifter attachments for tofu litter. Avoid lightweight litters, which can trigger false sensor readings. PETKIT’s own branded litter is not required.
