Brand

PETKIT self-cleaning litter boxes

PETKIT's Purobot drums share a 76-litre cylinder on an intentionally incomplete gear, so the entry cannot rotate shut. Its US store no longer sells the PuraMax 2 and redirects that page to the Purobot Max 3. Every model carries a two-year warranty.

Models: 4
Price span: $200–$800
Lowest detection weight: 3.3 lb
Largest drawer: 10 L

Ordered by price, lowest first.

PETKITP9905Crystal tray

PETKIT~$200

PETKIT Purobot Crystal Duo

Crystal tray

Automate from ~3.3 lb / ~6 months

Days between emptying: tray: up to 30 days
Big-cat fit: not published
Running cost: ~$20/month

Camera
Crystal trays
~$20 / set

Best for: Single-cat owners who want a camera on a crystal-tray box

PETKIT~$400

PETKIT Purobot Max 3

Rotating drum

Automate from ~3.3 lb / ~6 monthsAnti-pinch protection

Days between emptying: ~10 days, 1 cat
Big-cat fit: to 22 lb
Running cost: no required consumable

Low entry
7 L bin
No camera

Best for: One or two cats under 22 lb, especially older cats that struggle with a high step

PETKIT~$500

PETKIT Purobot Max Pro 2

Rotating drum

Automate from ~3.3 lb / ~4 monthsAnti-pinch protection

Days between emptying: ~11 days, 1 cat
Big-cat fit: to 22 lb
Running cost: no required consumable

AI camera
8 L bin
Anti-pinch gear

Best for: Multi-cat homes that need cats told apart and can live with a 22 lb ceiling

PETKITP9903Rotating drum

PETKIT~$800

PETKIT Purobot Ultra

Rotating drum

Automate from ~3.3 lb / ~6 monthsAnti-pinch protection

Days between emptying: ~14 days, 1 cat
Big-cat fit: to 22 lb
Running cost: ~$16/month

Self-sealing bags
10 L bin
20 sensors

Best for: Owners who most want never to handle an open waste bag