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Smarty Pear Leo's Loo Too vs Whisker Litter-Robot 4

Researched by Riley Hart · prices checked Oct 26, 2026

Short answer · checked Oct 26, 2026

As of Oct 26, 2026, the Smarty Pear Leo's Loo Too costs $700 and the Whisker Litter-Robot 4 costs $699, so the Whisker Litter-Robot 4 is $1 cheaper. Pick the Smarty Pear Leo's Loo Too for odor control in small apartments. Pick the Whisker Litter-Robot 4 for one to four average size cats.

Litter box
Smarty PearLeo's Loo Too
Cat weight
2 lb minimum
Litter
Clay clumping litter
Waste drawer
Lidded drawer
ON SALEPrice tracked daily
$700Check price at Tractor Supply →

Leo's Loo Too is a large drum box that testers credit with strong odor control thanks to its UV light and carbon filter. It is pricey and bulky, and one Rover tester's cat hissed at the cycle noise and avoided it. Keep a backup box until a nervous cat adjusts.

Full Smarty Pear Leo's Loo Too review →
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 →

Side by side

Smarty Pear Leo's Loo TooWhisker Litter-Robot 4
Price$700$699
3 year cost$781$1,035
Our scoreNot scored yetNot scored yet
Rank in Litter box#17#16
Statuson saleon sale
Warrantyn/a1 year (WhiskerCare), extendable to 3 years; 90 day in home trial
Cat weight range2 lb minimum (Rover); 55 lb maximum (The Gadgeteer)3 to 25 lb (kittens under 3 lb need semi automatic mode)
Max catsNot statedUp to 4
Waste drawerLidded drawer with drawstring liners, filled in 7 to 9 days for one cat (NBC Select)Sealed drawer with carbon filter, as little as once every 8 days (maker claim)
SensorsRadar wall, weight detection and anti pinch sensorLaser and weight sensors, SmartScale cat weight tracking, SafeCat system
AppCasa Leo app with visit log and remote cleaning; Alexa and Google voice controlWhisker app (2.4 GHz WiFi); free 7 day view, Whisker+ optional
Litter typeClay clumping litterClumping clay recommended; crystals only if they pass the screen; plant based and pellet litters not recommended
Size22 x 24 x 27.6 in, needs about 1 in wall clearance22 x 27 in footprint, 29.5 in tall, 15.75 x 15.75 in entry, 24 lb empty
Noise30 dB (maker claim per Tractor Supply)No dB rating published; QuietSift motor
Best forodor control in small apartmentsone to four average size cats
Skip ifyour cat is noise sensitive or space is tightyour cat is over 25 lb

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

What reviewers found

Smarty Pear Leo's Loo Too

  • Rover: No noticeable drawer smell after an 11 day absence and the app identified a cat by weight; one cat kept hissing at the cycle and avoided the box. Source
  • NBC Select: Used for over six months with one cat in a New York City apartment; the drum stopped when the cat approached, and the drawer filled in about 7 to 9 days. Source
  • The Gadgeteer: Odor was much lower than a standard box and the cat adjusted within hours; weight sensing may not work on carpet or soft floors. Source

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

Pros and cons

Smarty Pear Leo's Loo Too

Pros

  • Strong odor control in two long tests
  • Radar stops the drum when a cat approaches
  • Works with Alexa and Google
  • Uses common clay clumping litter

Cons

  • High price for its class
  • Large footprint, 27.6 in tall
  • One tester's cat avoided it over noise
  • Weight sensing may fail on carpet

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

Questions buyers ask

Which is better, the Smarty Pear Leo's Loo Too or the Whisker Litter-Robot 4?

Pick the Smarty Pear Leo's Loo Too for odor control in small apartments. Pick the Whisker Litter-Robot 4 for one to four average size cats.

Which is cheaper?

The Whisker Litter-Robot 4 at $699, versus $700 for the Smarty Pear Leo's Loo Too, checked Oct 26, 2026. Over 3 years with running costs: $781 vs $1,035.

What is the difference between the Leo's Loo Too and the Litter-Robot 4?

Cat weight range: 2 lb minimum (Rover); 55 lb maximum (The Gadgeteer) on the Leo's Loo Too, 3 to 25 lb (kittens under 3 lb need semi automatic mode) on the Litter-Robot 4. Max cats: Not stated on the Leo's Loo Too, Up to 4 on the Litter-Robot 4. Waste drawer: Lidded drawer with drawstring liners, filled in 7 to 9 days for one cat (NBC Select) on the Leo's Loo Too, Sealed drawer with carbon filter, as little as once every 8 days (maker claim) on the Litter-Robot 4.

Also consider

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