Purobot Crystal Duo vs Litter-Robot 4
One requires the maker's own litter, the other takes standard litter
Petkit Purobot Crystal Duo
Buy now$199.99
Currently listed price on petkit.com for this open-top disposable-tray model.
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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.
- Purobot Crystal Duo lists at $199.99, $499.01 below Litter-Robot 4 at $699.
- Proprietary litter required: published for Purobot Crystal Duo, not for Litter-Robot 4.
- Warranty: Purobot Crystal Duo 24 months versus Litter-Robot 4 12 months (100% more). Published data favours Purobot Crystal Duo.
- Minimum cat weight: Purobot Crystal Duo 3.3 lbs versus Litter-Robot 4 3 lbs (10% more). Published data favours Litter-Robot 4.
- Subscription required: published for Purobot Crystal Duo, not for Litter-Robot 4.
- Litter type required: Purobot Crystal Duo — Petkit Crystal litter disposable tray; Litter-Robot 4 — Clumping clay litter.
- Cleaning cycle trigger: Purobot Crystal Duo — 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 Crystal Duo — Disposable absorbent crystal litter tray; Litter-Robot 4 — Sealed waste drawer with carbon filter.
Full specification comparison
| Attribute | Purobot Crystal Duo | Litter-Robot 4 |
|---|---|---|
| Multi-cat suitable | Yes | Yes |
| Minimum cat weight | 3.3 lbs | 3 lbs |
| Maximum cat weight | Not published by either | Not published by either |
| Waste drawer capacity | Not published by either | Not published by either |
| Litter type required | Petkit Crystal litter disposable tray | Clumping clay litter |
| Proprietary litter required | Yes | No |
| Proprietary waste bags required | No | No |
| Subscription required | Yes | 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 | Disposable absorbent crystal litter tray | Sealed waste drawer with carbon filter |
| Entry height | 7.08 in | Not published |
| Interior dimensions | Not published by either | Not published by either |
| Footprint | 32.2 x 19.96 x 13.14 in | Not published |
| Operating noise | Not published by either | Not published by either |
| Power source | AC adapter, 12V/2A | AC power |
| Battery backup | No | Not published |
| Warranty | 24 months | 12 months |