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Last updated on October 3, 2026
The PETKIT automatic litter box lineup on Amazon has three main models, and they suit different homes. The PuraMax 2 is the established model. The Purobot Max 3 adds a wider opening and a semi-enclosed design. The Purobot Ultra bags its own waste and logs visits with a camera.
For most homes, the PuraMax 2 is the PETKIT to start with because it’s the established model with a large body of owner feedback. Choose the Max 3 for its wider entry, or the Ultra if automatic waste bagging is the feature you want most.
To see how PETKIT compares with other brands, our best automatic litter box guide covers the whole category.
Quick Picks
Best established model: PETKIT PuraMax 2
Best wider-entry model: PETKIT Purobot Max 3
Best hands-free waste handling: PETKIT Purobot Ultra
| Model | Best For | Watch Out For |
|---|---|---|
| PuraMax 2 | A proven model with per-cat weight logs | Drum sticking on default settings |
| Purobot Max 3 | Cats that need more entrance room | Newer, limited Amazon reviews so far |
| Purobot Ultra | Never changing a waste bag | Largest footprint, Care+ for 30-day video history |
PETKIT PuraMax 2
Why It Stands Out
Its 7.87-inch entry is low enough that even its harshest reviewer said their senior cat used it easily. Multiple owners describe it as quiet, and it arrives mostly assembled.
Per-cat weight tracking is its most praised feature. The app logs weight, visit count and visit length for each cat, which can help you notice changes in habits. It’s a log, not a diagnosis, so take any concern to your vet.
It has 11 safety sensors, and the entrance stays open rather than closing during a cycle.
Possible Downsides
Waste can stick to the drum on default settings. Some owners reduced sticking by adding a short cleaning delay and turning on Waste Covering Mode. It also connects only over 2.4 GHz Wi-Fi, which can complicate setup on some newer routers.
Best For
Homes that want PETKIT’s established model and per-cat weight logs.
PETKIT Purobot Max 3
Why It Stands Out
The Max 3 has a roughly 10.5 by 10.7-inch opening with an 8-inch entry height, giving cats a wider way in than the PuraMax 2.
Two sifters come in the box, one for clay and one for tofu, so you can keep using the litter you already like. A shared-access app feature lets more than one person in the house monitor the box.
Possible Downsides
It’s newer than the PuraMax 2, and Amazon review evidence for it is still limited.
Best For
Cats that need more entrance room, and owners who prefer the Max 3’s wider opening.
PETKIT Purobot Ultra
Why It Stands Out
When the bin fills, the Ultra heat-seals the bag and loads a fresh one by itself. Owners in three countries call this its standout feature, and one reports three units running for over a year with no issues.
The drum rotates sideways and the entrance remains open rather than closing during a cycle. Owners also praise the design for keeping the interior clean, and they consistently report strong odor control, crediting the sealed waste door.
A camera logs each visit and tracks patterns like visit frequency and clump size. It’s a record, not a diagnostic tool, so take any concern to your vet. It connects over both 2.4 and 5 GHz Wi-Fi.
Possible Downsides
It’s the largest PETKIT box, so measure first. PETKIT Care+ is required if you want the extended 30-day video history. Some large cats have been reluctant to go fully inside the chamber.
Best For
Owners who want the most hands-off waste handling PETKIT offers, plus camera logs of each visit.
Frequently Asked Questions
What’s the weight limit on PETKIT litter boxes?
PETKIT currently lists the PuraMax 2, Purobot Max 3 and Purobot Ultra for cats from 3.3 to 22 lb. Some retailer listing details show different figures, so we’re following PETKIT’s current specifications.
Do I have to buy PETKIT’s own litter?
No. Owners report good results with regular clay and tofu litters. Follow your model’s manual on litter type, and see our guide to the best cat litter for automatic litter boxes for options.
Which PETKIT is best for multiple cats?
The Purobot Ultra is the PETKIT built for busier boxes, with a camera that tells cats apart and automatic bagging. Our best automatic litter box for multiple cats compares it with other brands.
Does PETKIT make other litter boxes?
Yes. PETKIT also sells the Purobot Max Pro 2 and the Purobot Crystal Duo, which aren’t covered here.
