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Whisker Litter-Robot 4: What to Know
Litter-Robot 4 works on a sifting-globe design: a cat enters, and laser plus weight sensors confirm it has left before the globe rotates to separate clumps from clean litter, dropping waste into a sealed drawer with a built-in carbon filter. Whisker rates the unit for cats from 3 to 25 lbs and up to four cats sharing one box, which is a meaningfully wider range than the smaller EVO covered later in this guide. The footprint runs 22 x 27 inches with a 29.5-inch height and a 15.75 x 15.75-inch entryway, so it needs real floor space, not a tight bathroom corner.
We picked the "with Step & Fence" configuration specifically, since Litter-Robot 4 ships under several different Amazon listings (bare unit, various accessory bundles, different colors), and this one is a clearly labeled, currently in-stock SKU rather than a generic name that could map to more than one product. The included step helps shorter cats and kittens reach the elevated entry, and the fence helps contain any litter that gets kicked out during use. It also comes with 1 year of WhiskerCare coverage built in.
The Whisker app requires a 2.4GHz WiFi connection and tracks each cat's weight and litter-box usage over time, with a paid Whisker+ tier extending that history to two years. Whisker markets QuietSift technology to keep the cleaning cycle from being disruptive, though a globe-rotation mechanism this size is still audible in a quiet room. At $699 for this configuration, it's a premium price point in this category, and it's worth checking Whisker's own 90-day in-home trial before committing if the cost is a stretch.
Key Listed Features
Patented sifting globe with laser and weight sensors that trigger cleaning after each visit
Rated for up to four cats, 3-25 lbs each
Sealed waste drawer with a built-in carbon filter, compatible with OdorTrap refill packs
This configuration includes a step, a fence, and 1 year of WhiskerCare coverage
