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Whisker Litter-Robot 4 vs Whisker Litter-Robot 5

Researched by Riley Hart · prices checked Oct 26, 2026

Short answer · checked Oct 26, 2026

As of Oct 26, 2026, the Whisker Litter-Robot 4 costs $699 and the Whisker Litter-Robot 5 costs $799, so the Whisker Litter-Robot 4 is $100 cheaper. Pick the Whisker Litter-Robot 4 for one to four average size cats. Pick the Whisker Litter-Robot 5 for large cats and multi cat homes.

Litter box
WhiskerLitter-Robot 4
Cat weight
3 to 25 lb
Max cats
Up to 4
Litter
Clumping clay
Waste drawer
Sealed
ON SALEPrice tracked daily
$699Check price at Amazon →

A well tested globe box with a long track record and a large parts and support network, now $100 cheaper than the Litter-Robot 5. Owners of big cats over 25 lb, or anyone who wants urine vs stool detection, should look at the 5 instead.

Full Whisker Litter-Robot 4 review →
Litter box
WhiskerLitter-Robot 5
Cat weight
3 to 30 lb
Max cats
Up to 5
Litter
Clumping clay
Waste drawer
Sealed
ON SALEPrice tracked daily
$799Check price at Whisker store →

The sensible pick in the Litter-Robot 5 family: same globe, drawer and weight tracking as the Pro without the cameras. It suits larger cats and multi cat homes better than the Litter-Robot 4, but the LitterHopper add on is listed separately and settings live only in the app.

Full Whisker Litter-Robot 5 review →

Side by side

Whisker Litter-Robot 4Whisker Litter-Robot 5
Price$699$799
3 year cost$1,035$955
Our scoreNot scored yetNot scored yet
Rank in Litter box#16#18
Statuson saleon sale
Warranty1 year (WhiskerCare), extendable to 3 years; 90 day in home trial1 year (WhiskerCare), extendable to 3 years; 90 day in home trial
Cat weight range3 to 25 lb (kittens under 3 lb need semi automatic mode)3 to 30 lb
Max catsUp to 4Up to 5
Waste drawerSealed drawer with carbon filter, as little as once every 8 days (maker claim)Sealed drawer with carbon filter, up to 10 days for one cat (maker claim)
SensorsLaser and weight sensors, SmartScale cat weight tracking, SafeCat systemMultiple lasers, weight sensing, SmartScale, WasteID urine vs stool detection, SafeCat system
AppWhisker app (2.4 GHz WiFi); free 7 day view, Whisker+ optionalWhisker app (2.4 GHz WiFi); free tier shows 7 days of visits and weights
Litter typeClumping clay recommended; crystals only if they pass the screen; plant based and pellet litters not recommendedClumping clay recommended; plant based, non clumping, paper and pellet litters not recommended
Size22 x 27 in footprint, 29.5 in tall, 15.75 x 15.75 in entry, 24 lb empty22 x 27 in footprint, 29.9 in tall, 15.75 x 15.75 in entry, 28.7 lb empty
NoiseNo dB rating published; QuietSift motorNo dB rating published; QuietSift motor
Best forone to four average size catslarge cats and multi cat homes
Skip ifyour cat is over 25 lbyou want the lowest price from Whisker

Specs are maker claims unless a reviewer is named. Prices from the stores we link, checked daily.

What reviewers found

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
  • 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
  • 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

Whisker Litter-Robot 5

  • Cats.com: Described in the October 2026 roundup as nearly the same as the 5 Pro without cameras, saving $100. Source
  • 9to5Toys: Review of the 5 series found it quieter, smoother and less sensitive to placement on carpet than the Litter-Robot 4, with a better carbon filter. Source

Pros and cons

Whisker Litter-Robot 4

Pros

  • Long track record and wide parts availability
  • Laser plus weight sensing with SafeCat
  • Free app weight tracking
  • 90 day in home trial

Cons

  • Smaller litter bed than the 5 series
  • Fine grain clumping litter only, not tofu
  • Early units had sensor complaints
  • Bulky, needs a 22 x 27 in spot

Whisker Litter-Robot 5

Pros

  • Rated for cats up to 30 lb and up to 5 cats
  • WasteID tells urine from stool
  • Free app tracking without a subscription
  • 90 day in home trial

Cons

  • $799 is still a high entry price
  • No camera
  • Large footprint at 22 x 27 in
  • Reviewers prefer the Litter-Robot 4's raised buttons

Questions buyers ask

Which is better, the Whisker Litter-Robot 4 or the Whisker Litter-Robot 5?

Pick the Whisker Litter-Robot 4 for one to four average size cats. Pick the Whisker Litter-Robot 5 for large cats and multi cat homes.

Which is cheaper?

The Whisker Litter-Robot 4 at $699, versus $799 for the Whisker Litter-Robot 5, checked Oct 26, 2026. Over 3 years with running costs: $1,035 vs $955.

What is the difference between the Litter-Robot 4 and the Litter-Robot 5?

Cat weight range: 3 to 25 lb (kittens under 3 lb need semi automatic mode) on the Litter-Robot 4, 3 to 30 lb on the Litter-Robot 5. Max cats: Up to 4 on the Litter-Robot 4, Up to 5 on the Litter-Robot 5. Waste drawer: Sealed drawer with carbon filter, as little as once every 8 days (maker claim) on the Litter-Robot 4, Sealed drawer with carbon filter, up to 10 days for one cat (maker claim) on the Litter-Robot 5.

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