Purobot Max 3 vs Litter-Robot EVO
Cross-brand multi-cat rivals at a similar price
Petkit Purobot Max 3
Buy now$399.99
Currently listed price on petkit.com; the page shows a higher regular price.
Buy now
Whisker Litter-Robot EVO
Buy now$599
Manufacturer starting price on whisker.com ("as low as $599"); bundles cost more.
Buy now · Manufacturer US/Canada PDP live; as low as $599 with Add to cart / InStock signals (verified 2026-09-12).
Where the published data differs
Every line below is computed from the two manufacturers’ own figures. Attributes neither brand publishes are omitted.
- Purobot Max 3 lists at $399.99, $199.01 below Litter-Robot EVO at $599.
- Maximum cat weight: Purobot Max 3 22 lbs versus Litter-Robot EVO 19 lbs (16% more). Published data favours Purobot Max 3.
- Warranty: Purobot Max 3 24 months versus Litter-Robot EVO 12 months (100% more). Published data favours Purobot Max 3.
- Minimum cat weight: Purobot Max 3 3.3 lbs versus Litter-Robot EVO 3 lbs (10% more). Published data favours Litter-Robot EVO.
- Proprietary waste bags required: published for Purobot Max 3, not for Litter-Robot EVO.
- Litter type required: Purobot Max 3 — Clumping clay, tofu, corn or bentonite litters; Litter-Robot EVO — Clumping clay litter.
- Cleaning cycle trigger: Purobot Max 3 — Automatic after the cat exits, with app scheduling; Litter-Robot EVO — Weight sensors start the cycle after the cat exits.
- Odor control method: Purobot Max 3 — Four-part OdorVoid system with sealed waste bin; Litter-Robot EVO — Sealed waste drawer with carbon filter.
Full specification comparison
| Attribute | Purobot Max 3 | Litter-Robot EVO |
|---|---|---|
| Multi-cat suitable | Yes | Yes |
| Minimum cat weight | 3.3 lbs | 3 lbs |
| Maximum cat weight | 22 lbs | 19 lbs |
| Waste drawer capacity | 7 L | Not published |
| Litter type required | Clumping clay, tofu, corn or bentonite litters | 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 | Weight sensors start the cycle after the cat exits |
| Adjustable cycle delay | Yes | Yes |
| App control | Yes | Yes |
| Weight sensing | Yes | Yes |
| Health monitoring | Yes | Yes |
| Odor control method | Four-part OdorVoid system with sealed waste bin | Sealed waste drawer with carbon filter |
| Entry height | 8.03 in | Not published |
| Interior dimensions | Not published by either | Not published by either |
| Footprint | 24.4 x 21.2 x 21.7 in | 20.6 x 24.3 in |
| Operating noise | 35 dB | Not published |
| Power source | AC adapter, 12V/2A | 15 Volt DC / AC adapter |
| Battery backup | No | Not published |
| Warranty | 24 months | 12 months |