Smart litter boxes
Whisker Litter-Robot 4 review
Published 20 June 2026
The benchmark, and still the one to beat. Best-in-class scooping, the quietest cycle on test, excellent sealed-drawer odour control and the most reliable long-term record. The price is the catch, it is among the most expensive.
Best for: Owners wanting the most reliable, low-maintenance option
From £599.00 checked 20 Jun 2026
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What works
- Best scooping performance
- Quietest on test
- Excellent odour control
- Reliable long-term record
- 2-year warranty
What falls short
- Among the most expensive
- Large footprint
- Enclosed design some cats refuse
How it scores
We rate every product in this category on the same criteria, weighted by how much they matter in daily use. Each score is out of 10.
| Criterion | Weight | Score | Why |
|---|---|---|---|
| Cleaning reliability | 20% | 9.5 | Best scooping on test, catches small urine clumps and reduces wall sticking better than rivals |
| Safety | 20% | 9.0 | Weight sensor plus timed delay; long proven safety record Confirm on your exact model before relying on it. |
| Odour control | 15% | 9.0 | Rotating drum seals waste in a drawer, excellent odour containment ideal for flats |
| Noise | 10% | 9.5 | Quietest model tested, runs at night without disturbing anyone |
| Capacity and cat suitability | 10% | 8.5 | Large drum suits most cats; multi-cat empties every 4-5 days |
| App and health monitoring | 10% | 8.5 | Strong Whisker app with weight and usage tracking, multi-cat recognition |
| Ease of cleaning and maintenance | 10% | 8.0 | Drawer empties cleanly; periodic deep clean straightforward |
| Value | 5% | 6.5 | Premium price is the main drawback |
| Weighted total | 8.83 |
How we score: each rating combines the manufacturer specification with the weight of feedback from owners and independent reviewers. We do not copy other reviews. The score is our own synthesis, and we show the reasoning so you can judge it yourself.
See how the Whisker Litter-Robot 4 ranks against other smart litter boxes
Key specifications
| Mechanism | Rotating drum, sealed drawer |
|---|---|
| Noise | Very quiet |
| Safety | Weight sensor plus timed delay |
| App | Whisker, weight and usage tracking |
| Warranty | 2-year |
| Best for | Set-and-forget reliability |
Common questions
Is the Litter-Robot 4 worth the price?
If you want the most reliable, low-maintenance option and the best odour control, yes. It is the closest to set-and-forget automation on the market. The main reason to look elsewhere is budget, where the Petkit Pura Max 2 offers most of the performance for less.
Is it safe for cats?
It has a strong safety record, using a weight sensor and a timed delay so the drum will not turn while a cat is inside. It is one of the most proven units on safety.
How often do I empty it?
For one cat, around every 7-10 days. For two cats, every 4-5 days. The sealed drawer keeps odour contained between empties.
Looking at something else? See our automatic cat feeders