# PETKIT Purobot Max Pro 2 vs Whisker Litter-Robot 4

As of Nov 4, 2026, the PETKIT Purobot Max Pro 2 costs $500 and the Whisker Litter-Robot 4 costs $699, so the PETKIT Purobot Max Pro 2 is $199 cheaper. Pick the PETKIT Purobot Max Pro 2 for camera monitoring on a smaller budget. Pick the Whisker Litter-Robot 4 for one to four average size cats.

Prices checked Nov 4, 2026. HTML version: https://robotsforthat.com/vs/petkit-purobot-max-pro-2-vs-whisker-litter-robot-4/

## Side by side

| | PETKIT Purobot Max Pro 2 | Whisker Litter-Robot 4 |
|---|---|---|
| Price | $500 | $699 |
| 3 year cost | $643 | $1,035 |
| Our score | Not scored yet | Not scored yet |
| Rank in Litter box | #20 | #23 |
| Status | on sale | on sale |
| Warranty | 2 years (shown on PETKIT product page badge) | 1 year (WhiskerCare), extendable to 3 years; 90 day in home trial |
| Cat weight range | 3.3 to 22 lb | 3 to 25 lb (kittens under 3 lb need semi automatic mode) |
| Max cats | Camera recognizes up to 15 cats | Up to 4 |
| Waste drawer | 8 L sealed side drawer, up to 17 days for one cat (maker claim via TechnoMeow) | Sealed drawer with carbon filter, as little as once every 8 days (maker claim) |
| Sensors | 12 sensors including proximity and weight, anti pinch | Laser and weight sensors, SmartScale cat weight tracking, SafeCat system |
| App | PETKIT app, 2.4 and 5 GHz WiFi; 1080p 210 degree AI camera | Whisker app (2.4 GHz WiFi); free 7 day view, Whisker+ optional |
| Litter type | Clumping clay, tofu and mixed; two sifters included | Clumping clay recommended; crystals only if they pass the screen; plant based and pellet litters not recommended |
| Size | 25.86 x 21.18 x 23.74 in, 24.25 lb, 10.5 x 10.7 in entrance | 22 x 27 in footprint, 29.5 in tall, 15.75 x 15.75 in entry, 24 lb empty |
| Noise | 35 dB (maker claim) | No dB rating published; QuietSift motor |
| Best for | camera monitoring on a smaller budget | one to four average size cats |
| Skip if | you have a very large cat | your cat is over 25 lb |

## What reviewers found

### PETKIT Purobot Max Pro 2

- TechnoMeow: Camera helped monitor a senior cat with a vestibular condition; odor control excellent; sensors unreliable on carpet so manual scoop mode was used. [Source](https://technomeow.com/petkit-purobot-max-pro-2-review/)

### Whisker Litter-Robot 4

- Cats.com: Runner Up in the October 2026 roundup; reliable and well built, but the smaller litter bed may not suit large cats. [Source](https://cats.com/reviews/best-self-cleaning-litter-box)
- The Irish Times: Quiet, no smells and a clean tray in a home test; sensors stopped the drum when a cat entered; app cat ID was less accurate for cats of similar size. [Source](https://www.irishtimes.com/technology/consumer-tech/review/2026/10/03/litter-robot-4-review-fed-up-with-scooping-cat-litter-try-this/)
- CNN Underscored: Drawer needed emptying about once a week with two cats; quieter than the Litter-Robot 3; cats took about a week to adjust. [Source](https://amp.cnn.com/cnn/cnn-underscored/reviews/litter-robot-4-review)

## Questions buyers ask

### Which is better, the PETKIT Purobot Max Pro 2 or the Whisker Litter-Robot 4?

Pick the PETKIT Purobot Max Pro 2 for camera monitoring on a smaller budget. Pick the Whisker Litter-Robot 4 for one to four average size cats.

### Which is cheaper?

The PETKIT Purobot Max Pro 2 at $500, versus $699 for the Whisker Litter-Robot 4, checked Nov 4, 2026. Over 3 years with running costs: $643 vs $1,035.

### What is the difference between the Purobot Max Pro 2 and the Litter-Robot 4?

Cat weight range: 3.3 to 22 lb on the Purobot Max Pro 2, 3 to 25 lb (kittens under 3 lb need semi automatic mode) on the Litter-Robot 4. Max cats: Camera recognizes up to 15 cats on the Purobot Max Pro 2, Up to 4 on the Litter-Robot 4. Waste drawer: 8 L sealed side drawer, up to 17 days for one cat (maker claim via TechnoMeow) on the Purobot Max Pro 2, Sealed drawer with carbon filter, as little as once every 8 days (maker claim) on the Litter-Robot 4.

Full reviews: [PETKIT Purobot Max Pro 2](https://robotsforthat.com/robot/petkit-purobot-max-pro-2/index.md), [Whisker Litter-Robot 4](https://robotsforthat.com/robot/whisker-litter-robot-4/index.md)