Litter-Robot EVO vs Litter-Robot 4
Same brand, adjacent models in the range
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).
Whisker Litter-Robot 4
Buy now$699
Whisker lists the unit from $699; colour and bundle options raise the price.
Buy now
Where the published data differs
Every line below is computed from the two manufacturers’ own figures. Attributes neither brand publishes are omitted.
- Litter-Robot EVO lists at $599, $100 below Litter-Robot 4 at $699.
- Cleaning cycle trigger: Litter-Robot EVO — Weight sensors start the cycle after the cat exits; Litter-Robot 4 — SmartScale weight sensor starts a countdown after the cat exits (3 lb minimum to register).
- Power source: Litter-Robot EVO — 15 Volt DC / AC adapter; Litter-Robot 4 — AC power.
Full specification comparison
| Attribute | Litter-Robot EVO | Litter-Robot 4 |
|---|---|---|
| Multi-cat suitable | Yes | Yes |
| Minimum cat weight | 3 lbs | 3 lbs |
| Maximum cat weight | 19 lbs | Not published |
| Waste drawer capacity | Not published by either | Not published by either |
| Litter type required | Clumping clay litter | Clumping clay litter |
| Proprietary litter required | No | No |
| Proprietary waste bags required | No | No |
| Subscription required | No | No |
| Cleaning cycle trigger | Weight sensors start the cycle after the cat exits | 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 | Sealed waste drawer with carbon filter | Sealed waste drawer with carbon filter |
| Entry height | Not published by either | Not published by either |
| Interior dimensions | Not published by either | Not published by either |
| Footprint | 20.6 x 24.3 in | Not published |
| Operating noise | Not published by either | Not published by either |
| Power source | 15 Volt DC / AC adapter | AC power |
| Battery backup | Not published by either | Not published by either |
| Warranty | 12 months | 12 months |