Litter-Robot 4IIAssistedCompare

Released 2022Reassessed 2026.09.02Compare

Litter-Robot 4

Name: Litter-Robot 4
Brand: Whisker

Litter-Robot 4 automates the physical removal of clumped waste after each use and pauses when sensors detect a cat inside, reducing daily scooping. Litter refills, waste-drawer emptying, and litter-type compatibility remain the owner's responsibility; the manufacturer restricts it to clumping clay litter.

List price

$699

See on Amazon

Some links earn Robovations a commission.

Released 2022Reassessed 2026.09.02

Autonomy Ladder

Why Level II.

One five-rung scale, every category, from acting only on command to working unsupervised anywhere.

VGeneralized AutonomyAny task, any setting. No consumer robot has reached it.
IVEnvironmental AutonomyCopes with everyday clutter and frees itself, shown by independent testing.
IIIConditional AutonomyFinishes whole jobs in familiar spaces; struggles at the edges.
To reach Level IIIMost sessions finish without intervention. Rescue is occasional, not routine.
IIAssisted AutonomyThis robot

Litter-Robot 4 runs preset routines on its own, and the owner is its recovery system.
What it does on its own
- Sifts clumping litter into a covered waste drawer after a confirmed cat exit; times the cycle delay (3-30 minutes, adjustable); detects cat presence via laser and weight (SafeCat/Omnisense) and aborts a cycle if a cat re-enters; tracks individual cat visits, weight, and waste-drawer/litter levels through the Whisker app when connected; operates its core sift function without WiFi.
Why this level
- The unit decides when to trigger a sift cycle after a set delay following cat exit, and pauses or aborts if its laser-and-weight SafeCat System detects a cat has returned.
- It cannot judge litter type, decide when to add litter, or empty its own waste drawer.
- A human sets cycle timing and weight profiles and performs all maintenance.
What holds it at Level II
- Requires clumping clay litter; the manufacturer states translucent or white litter can impair its litter-level and Drawer Full Indicator readings, and plant-based or non-clumping litters are listed as incompatible. SmartScale cat-weight accuracy is degraded on carpet without the optional tray. It does not navigate, clean itself, or refill litter.
4 independent sources reviewed, 4 from the maker
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Behind the classification

Sources on file.

Provisional4 independent sources reviewed, 4 from the maker

Two to four independent sources reviewed. Gaps remain across source types. The word says how much we read. It is not a grade.

Independent sources reviewed4

1 source

Encyclopedia background entry on the Litter-Robot product line

Litter-RobotWikipedia

Monitoring record3 sources

Sources behind the tracker entries following this robot.

From the maker, reviewed4

Specification sources1 source

Pages the published specifications were read from.

litter-robot.comlitter-robot.com

Monitoring record3 sources

Sources behind the tracker entries following this robot.

On file, not yet reviewedNot counted

Manufacturer documentation2 sources

Whisker product page, comparison chart, and support center for Litter-Robot 4

Our own recordNot counted

Longitudinal signal2 sources

Robovations dated log for this robot: 5 tracked entries spanning ~31 months.

How we evaluate evidence →

Human Readiness

Ready Now.

One question: what does buying this robot today walk you into? The state is computed from the record, and recomputed daily.

Ready NowThis robot

Litter-Robot 4 is on sale, assessed, and nothing on its record argues for waiting.
How this was derived
- Shipping past the first-90-day ownership window with a published assessment, no documented issues on record, and no announced successor.
Notes on the record
- Widely available directly from Whisker at $699, with an established support center and multi-year sales history.
- Suited to households already using clumping clay litter that want reduced daily scooping; not suited to households using non-clumping or plant-based litter, which the manufacturer states the unit cannot process reliably.
On the record
- Shipping since January 2022 · 58 months on the market
- Retail listings on file: Amazon
- No successor announced
- 4 independent sources reviewed, 4 from the maker
What would move it
A documented problem, an announced successor, or a withdrawn listing moves it out; the rating recomputes daily.
New to MarketOn sale under 90 days; the ownership record is still forming.
WaitA successor is announced and has not shipped; re-read the decision when it arrives.
Known IssuesDocumented problems stand on the record; read the case before buying.

How we assess readiness →

Robovations Score

How this number was reached

63of 100

CapableAt or above 30% of the 456 robots we scoreand 68% of the 25 scored specialty robots

DeficientLimitedCapableStrongExemplary

Measured on 7 of the 9 inputs8% not counted

Our assessment did not establish an independent source for consumables on this machine, so that input is left out of the score rather than guessed at, and the rest re-weighted to fill the space. A gap in what we have been able to verify is not evidence against the robot. Where a whole pillar has nothing measured, we publish no number at all.

One input does not apply to this kind of machine

Coverage and navigation is not scored for automatic litter boxes. An automatic litter box has no route to plan and no map to keep: the whole litter bed passes the sifter on every cycle. Coverage and navigation is not a question this machine can answer well or badly, so it is left out of the score rather than guessed at. This is a limit of the measurement, not a gap in the evidence, so it is not counted against the record.

What moved itpoints gained or lost against a typical robot

Carried by

Support longevity72+1.0

Held back by

Field failure rate57−2.1
Edge-case recovery45−0.8

Capability40% of the score62What it does without you.

Task completion16% of the score70

Evidence

cats.com, multi-owner. Shelly (Sept 30 2025) runs three cats and reports she does not scoop at all. Against that, the same page's editorial synthesis says negative reviews often cite cycling errors and glitches, and a reader in the comment thread reports his current manual routine is a few minutes every other day and says he cannot identify where the machine saves him contact with the task. Engadget's tester separately reports having to press the cycle button when the unit did not clean after a visit. The cycle completes and leaves the bed usable most days, but a human closes the loop more often than occasionally. Sits below the 75 rung, well above the 50 rung.

Coverage and navigationnot counteddoes not apply here—

Edge-case recovery10% of the score45

Evidence

engadget.com hands-on. A fault reported through the Whisker app could only be cleared by turning the unit off and on, and the unit sometimes failed to clean after a cat used it, requiring a manual press of the cycle button. The reviewer counts three or four such interventions in a typical week and says he would not trust it to run unattended for a week. That is the 50 rung (detects, reports, needs a human to resume) for the reported faults, dragged down by the silent non-cycling, which is the 25 rung (fails without reporting, found stalled). Note: three community.robotshop.com threads on Litter-Robot 4 motor failure were unfetchable and are not scored here; a dead motor is failure_rate, not this input.

Operating envelope4% of the score72

Evidence

cats.com. Shelly's three cats all use it, so multi-cat operation is demonstrated. The same page's editorial reports that some customers remain displeased with the limited interior space, which is a documented degradation at the large-cat end of the range. Holds in common conditions with one documented constraint.

Dependability40% of the score64Whether it keeps doing it.

Field failure rate16% of the score57

Evidence

cats.com. The outlet's own synthesis of the owner corpus states that negative reviews often mention cycling errors and glitches that persisted despite troubleshooting and customer service assistance. Owner Ashley (Sept 13 2025) reports the programmed rotate-at-three-minutes never worked, that she had problems from purchase, and that they were unresolved by the time her return window closed. A recurring mode is documented, it is neither universal (the outlet reports over 70 percent five-star on the maker's own site) nor job-stopping. On sale since 2022. Three unfetchable robotshop threads titled on motor failure point the same way and are deliberately not scored.

Software stability14% of the score65

Evidence

engadget.com. At setup the unit would not self-clean at all without app pairing, and pairing was blocked by a system-wide Whisker outage; the company shipped a fix within a few days. The defect was documented and remedied, which the anchors place above a silent record. Pulled back from that rung because no release-note or update history for this model appears in evidence, and because the core function is structurally gated on the cloud connection.

Support longevity10% of the score72

Evidence

truthfulpaws.com, in its Neakasa M1 Plus review, names the Litter-Robot 4 as the category benchmark for long-term durability, a 25-year parts ecosystem and real customer support. Against that, cats.com reports a subset of owners whose cycling errors persisted through customer service assistance. Parts and a support channel plainly exist and are described by an independent outlet as the best in the class; a documented minority of unresolved cases holds it off the top.

Ownership burden20% of the score65What it asks of you.

Routine maintenance12% of the score65

Evidence

cats.com, three voices. Mallory Crusta of cats.com, replying in the comment thread, confirms there tends to be quite a bit of litter scatter to sweep. Shelly reports she does not scoop at all. The commenter she is answering reports his manual alternative runs a few minutes every other day and questions the saving. The drawer liner swap is the stated interval work; scatter and the maker-recommended monthly internal wipe-down and full litter change sit on top of it.

Consumablesnot countedno source verified—

Evidence

Our assessment did not establish a source outside the manufacturer's control for this input, so it is left out of the score rather than scored low. That is a gap in the record, not a finding about the machine.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Data postureCloud-optional

Full core function without an account; cloud adds convenience.

What leaves the homeDocumented

No camera is present; detection uses laser and weight sensors only. The Whisker app collects cat weight (via SmartScale), visit frequency and duration, usage trends, and device status when connected to WiFi. The free tier retains roughly 7 days of visit/weight history; the paid Whisker+ tier extends this to up to 2 years. The core sift cycle operates without an internet connection; WiFi is required only for app-based monitoring and history.

On-device processingYes

Read the full methodology →

FIT CHECK

Will the Litter-Robot 4 fit your application?

Describe your use case using the controls. Each choice reads the spec sheet for you, flagging where the Litter-Robot 4 is built for your space and where it isn’t.

Cats In the Home

Litter Type Used

Largest Cat's Weight

Where It Will Sit

A classification of fit for the conditions you set, not a recommendation. Verdicts describe engineering design intent, not test results.

OWNERSHIP

Living with it.

Mature platform; most documented failures trace to litter choice and sensor misreads, not motors.

Stableowner-reported arc

The record so far

In market since 2022. Whisker documents the limitation classes: translucent litters impair level sensing, non-clumping litters jam the sifter, carpet placement degrades SmartScale accuracy. No independent aggregate failure-rate data is published.

What goes wrong5 documented · 1 self-recover

Common

Drawer full halts cyclesCycling stops until drawer emptied

Owner fixEmpty the drawer; cycles resume

Common

Cat re-entry cycle pauseCycle delayed, restarts automatically

Self-recoversNone; SafeCat resumes after the cat exits

Occasional

Litter-level misreadFalse drawer or litter readings

Owner fixUse opaque clumping litter per Whisker

Occasional

Sifting mechanism jamCycle stalls until cleared

Owner fixRemove clumps; avoid non-clumping litters

Occasional

SmartScale weight driftWrong cat identification, missed tracking

Owner fixMove off carpet or add the tray

Upkeep routine

Weekly52×/yr

Top off clumping clay litter to the fill line; Whisker's guide says once weekly for one cat, twice for multiple cats.

Empty the waste drawer and fit a fresh liner; Whisker's cadence runs from every 2 weeks with one cat to every other day with four (liners $35 per 50-pack).

Monthly12×/yr

Replace the carbon filter; Whisker recommends monthly for optimal odor absorption ($30 for a 6-pack, roughly $60 a year).

Spot-clean the globe and wipe the base; Whisker states monthly for one cat, weekly for four.

Seasonal4×/yr

Deep-clean the globe with mild soap and water; Whisker recommends at least every 3 months, monthly in four-cat homes.

As neededno fixed schedule

Adjust cycle-delay timing and per-cat weight profiles in the app; the Drawer Full Indicator halts cycles until the drawer is emptied.

Clear stray clumps from the sifting screen and keep to clumping clay litter; plant-based and non-clumping litters jam the mechanism.

Cost over timeabout $285 past the sticker over three years

PurchaseRunning cost

Year 1

$794

Year 3

$984

Year 5

$1,174

$699 to buy, then about $95 a year for the replaceable parts below. Over three years that is roughly $285 past the sticker price. Excludes electricity and any repairs.

What you replace

FilterMonthly$30

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes1 caution · 2 notes

CautionCats under 3 lbs undetectedBelow the 3-25 lb range a kitten may not pause the cycle.
SafeCat sensor dependencyLaser and Omnisense weight sensing confirm the cat exited; keep sensors clean.
Adjustable cycle delayOwner sets a 3-30 minute post-exit delay before cycling starts.

SPECIFICATION

The full spec sheet.

Priced above the category median, with every figure charted against the category below.

Dimensional drawing

Key specificationsManufacturer-publishedSources: Owner manual Manufacturer support Product page

FootprintThe width, depth and height of the robot itself, without its dock.: 22 × 27 in, 29.5 in tall•
WeightThe robot alone, without its dock, as the maker states it.: 24 lbs•
Wi-FiThe bands the robot can join; many models need a 2.4 GHz network to set up.: Supported•
Entryway size: 15.75 in x 15.75 in
Cat weight range: 3-25 lbs
Max cats: 4
Waste drawer interval: Up to 8 days (1-cat household)

Where it lands · position among 46 specialty robotsThis robotMedianTypical range

PriceThe maker's list price, not a price found in a shop.$699

$29$100,000

Bottom of range

WeightThe robot alone, without its dock, as the maker states it.24lbs

0.09 lbs131.59+ lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment.

Official referencesOwner manual Manufacturer support Product page

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Nov 2026 · AssessmentRecord status: Verified → Provisional
Sep 2026 · AssessmentRobovations Score recorded at 63 of 100
Aug 2026 · AssessmentRobovations Score rescored under v4.2
Nov 2024 · ReleaseWhisker brings Litter-Robot 4 to Best Buy stores nationwide
Aug 2023 · UpdateGains SmartScale weight-based cat identification in August 2023
Apr 2023 · UpdateWhisker app update adds per-pet profiles and insights for Litter-Robot 4
Nov 2022 · NewsNamed to TIME’s Best Inventions of 2022 list
May 2022 · AnnouncementWhisker announces Litter-Robot 4 with redesigned sifting globe and app insights

Questions

What people actually ask.

5 answered

CompatibilityDoes the Litter-Robot 4 need WiFi to work?

No. The core sifting cycle operates as a standalone function once plugged in; WiFi and the Whisker app are required only for remote monitoring, history, and notification features.

OperationWhat litter does it require?

The manufacturer specifies clumping clay litter. Plant-based and non-clumping litters are listed as incompatible, and translucent or white-colored litter can impair the litter-level and Drawer Full Indicator readings.

OperationHow often does the waste drawer need emptying?

The manufacturer states up to 8 days between emptying in a single-cat household; multi-cat households will need to empty it more often.

OperationWhat happens if a cat enters during a cycle?

The SafeCat System’s laser and weight sensors pause or abort the sift cycle if a cat is detected inside the unit.

OperationWhat cat weight range does it support?

The manufacturer states compatibility for cats weighing 3 to 25 lbs, with multi-cat households of up to 4 cats supported.

Availability

Where it's sold

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Amazon Check price & availability

Cite & Embed

Reference the Litter-Robot 4 classification.

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Citation

Robovations. "Litter-Robot 4: Autonomy Level II (Assisted Autonomy)." Autonomy Ladder™, assessed September 2026. https://robovations.com/robots/litter-robot-4/

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Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Litter-Robot 4 and CatLink Scooper Pro Ultra side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with PetKit Purobot Max Pro 2, Neakasa M1 Plus, Loona Petbot.

For browsers

See every Level II.

Every robot we’ve classified at assisted autonomy. Sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

Browse every Level II robot

Updated weekly with new entries and reclassifications.

Litter-Robot 4

Will the Litter-Robot 4 fit your application?

Living with it.

The full spec sheet.

How the assessment has moved.

What people actually ask.

Litter-Robot 4 in the analysis archive.

How much maintenance does an automatic litter box need, and are they safe for cats?

Why do Weave’s Isaac 1 and Nori’s A3 roll instead of walk?

Other specialty robots we have classified.

Sony Aibo ERS-1000

Pollen Robotics Reachy 2

Sharp Poketomo

Loona Petbot

Where it's sold

Reference the Litter-Robot 4 classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level II.