Litter-Robot 4 Review: Still the Smarter Buy Next to the 5?

The Litter-Robot 5 has been on sale for a while, and the question we keep getting is simple: did the newer box make the older one a bargain, or a dead end? Our answer is that the Litter-Robot 4 is the one most households should still buy. It also has a short list of people who should not.

What $699 gets you, and what it leaves out

The 4 is a globe-style box that rotates to sift clumps into a sealed drawer. Whisker rates it for cats from 3 to 25 lb and up to four cats per unit, with a 15.75 inch entrance and 16.5 inches of interior headroom. Empty, it weighs about 24 lb and measures 22 by 27 by 29.5 inches, so it needs real floor space.

There is no camera. The 4 has a laser sensor and a weight sensor, and its SmartScale logs each visit by weight so the app can tell a 9 lb cat from a 14 lb one. For most homes that is the entire feature list that matters. The app is free for basic use, with seven days of activity history and individual cat weights.

The unit needs a 2.4 GHz Wi-Fi network. A router that merges bands into one name can make setup fiddly, and Whisker states plainly that 5 GHz is not supported.

The gap to the Litter-Robot 5 is smaller than the price tag suggests

Whisker lists the Litter-Robot 5 at $799, so the step up is $100. For that you get room for five cats, a 30 lb limit, more headroom, a color display, a quieter sifting mode called QuietSift and WasteID, which separates urine clumps from solid waste.

Those are real improvements for a few buyers. If you have a cat above 25 lb, a fifth cat or a household where timing the cycle after urine matters, pay the $100. If you own one or two ordinary cats, none of it changes the central job, which is scooping. Several independent comparisons reach the same conclusion: the 4 is the better value for most homes, and the 5 is for people who hit one of its limits.

The Pro is a different decision again. At $899 it adds cameras, and we weighed that choice in our Litter-Robot 5 Pro review.

Where the 4 is known to misbehave

Self-cleaning boxes fail in predictable ways, and the 4 is no exception. These are the problems that independent testers and owners report most often:

• Occasional false alerts. Sensor glitches and incorrect "cat sensor" or drawer messages turn up in reviews. They usually clear with a reset, but they are irritating at 6 a.m.

• Carpet skews the scale. Weight readings drift on thick carpet unless you use the optional carpet tray, which matters if you track a cat's weight for health reasons.

• Litter choice is narrow. Whisker recommends standard clumping clay. Crystal, plant-based, newspaper and wood-pellet litters are not supported, and weak clumpers break apart during rotation and leave residue.

• The drawer is not a week of peace for everyone. Whisker says you may only need to empty it once every 8 days. That figure is for one cat. With three, plan on emptying it far more often.

None of these is a dealbreaker. All of them are worth knowing before you set aside the scoop.

The subscription question, answered

Whisker+ is the membership that stretches history to two years and adds trend charts, duration of visits and daily recaps. The Whisker+ page lists it at $7.99 a month or $79.90 a year.

On the 4 it is optional. The box sifts, tracks weights and sends alerts without it. We would skip it unless you have a cat with a health condition and a vet who actually wants the weight trend. Compare that with the Pro, where recognition features lean on the membership, and the 4 looks like the honest one: you pay once.

Running costs and warranty

The 4 takes ordinary liners, so you are not locked into Whisker's bags. Carbon filters need replacing every few weeks. Whisker includes a 1-year warranty and sells a 3-year WhiskerCare plan for $129, which covers accidental damage and ships free in both directions. We would take it: a motor and a drive system are a lot to trust for a year or two after the first twelve months.

Whisker also gives you a 90-day in-home trial with a money-back guarantee, which is the best answer to the real worry. Some cats refuse a rotating globe. Find out in the first fortnight, not after the return window.

Who should buy it and who should skip it

Buy the Litter-Robot 4 if you have one to four cats under 25 lb, you want an established design with years of field use and you do not need a camera. Retailers regularly discount it below $699, so watch for a sale.

Skip it if you have a very large cat, a household of five, or you want the quietest cycle available. Skip it too if a single small cat is the whole household: cheaper boxes do that job, and the 4 is a lot of money for one animal.

None of this is veterinary guidance. If a cat's litter habits change suddenly, call your vet. The box can log the change, but it cannot interpret it.

Our rating reflects a solid, well-proven machine that costs real money, has narrow litter rules and a Wi-Fi quirk, and is no longer the newest thing in Whisker's range.