Purobot Ultra vs Litter-Robot 4
Cross-brand multi-cat rivals at a similar price
Petkit Purobot Ultra
Buy now$799.99
Currently listed at $799.99 on petkit.com against a regular price of $899.99.
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Whisker Litter-Robot 4
Buy now$699
Whisker lists the unit from $699; colour and bundle options raise the price.
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Where the published data differs
Every line below is computed from the two manufacturers’ own figures. Attributes neither brand publishes are omitted.
- Litter-Robot 4 lists at $699, $100.99 below Purobot Ultra at $799.99.
- Warranty: Purobot Ultra 24 months versus Litter-Robot 4 12 months (100% more). Published data favours Purobot Ultra.
- Minimum cat weight: Purobot Ultra 3.3 lbs versus Litter-Robot 4 3 lbs (10% more). Published data favours Litter-Robot 4.
- Proprietary waste bags required: published for Purobot Ultra, not for Litter-Robot 4.
- Litter type required: Purobot Ultra — Clumping clay, tofu or mixed litter, particle length up to 12 mm; Litter-Robot 4 — Clumping clay litter.
- Cleaning cycle trigger: Purobot Ultra — Automatic after the cat exits, with app scheduling; Litter-Robot 4 — SmartScale weight sensor starts a countdown after the cat exits (3 lb minimum to register).
- Odor control method: Purobot Ultra — Auto-sealed waste bags with contactless packing; Litter-Robot 4 — Sealed waste drawer with carbon filter.
- Power source: Purobot Ultra — AC adapter, 12V/4A; Litter-Robot 4 — AC power.
Full specification comparison
| Attribute | Purobot Ultra | Litter-Robot 4 |
|---|---|---|
| Multi-cat suitable | Yes | Yes |
| Minimum cat weight | 3.3 lbs | 3 lbs |
| Maximum cat weight | 22 lbs | Not published |
| Waste drawer capacity | 10 L | Not published |
| Litter type required | Clumping clay, tofu or mixed litter, particle length up to 12 mm | Clumping clay litter |
| Proprietary litter required | No | No |
| Proprietary waste bags required | Yes | No |
| Subscription required | No | No |
| Cleaning cycle trigger | Automatic after the cat exits, with app scheduling | SmartScale weight sensor starts a countdown after the cat exits (3 lb minimum to register) |
| Adjustable cycle delay | Yes | Yes |
| App control | Yes | Yes |
| Weight sensing | Yes | Yes |
| Health monitoring | Yes | Yes |
| Odor control method | Auto-sealed waste bags with contactless packing | Sealed waste drawer with carbon filter |
| Entry height | 10.43 in | Not published |
| Interior dimensions | Not published by either | Not published by either |
| Footprint | 20.94 x 32.2 x 24.09 in | Not published |
| Operating noise | Not published by either | Not published by either |
| Power source | AC adapter, 12V/4A | AC power |
| Battery backup | No | Not published |
| Warranty | 24 months | 12 months |