Whisker

Litter-Robot 4

Name: Whisker Litter-Robot 4
Brand: Whisker

rotating globe, sifting

$600+ 83% documented 5/6 litter types stated

The short version

Whisker Litter-Robot 4 uses a rotating globe, sifting mechanism. The manufacturer states it takes clumping clay litter and excludes tofu, pine pellet and other pellet. It is stated for cats up to 25 lb by the manufacturer. 1 of the 6 questions buyers most often ask is not answered anywhere in the manufacturer's own material.

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Whisker Litter-Robot 4 — AI-assisted editorial representation, not a photograph — AI-assisted editorial representation, composed by PURRINDEX from documented product characteristics and official visual reference. Not manufacturer photography.

From documented evidence only

Who this appears to fit

Good fit if…

You use clumping clay litter — the manufacturer's manual states this is supported
Your heaviest cat is under 25 lb — the stated maximum according to the manufacturer
You want to try it before committing — the manufacturer documents a 90-day trial

Not a documented fit if…

You use tofu, pine pellet and other pellet litter — the manufacturer excludes or advises against it
Your cat is over 25 lb — the manufacturer states that as the maximum

Each line above is derived from a value the manufacturer published; the source is shown against that value in the evidence table below. PURRINDEX draws no conclusion from a field a manufacturer left blank.

What sets this one apart

Key documented differences

Crystal litter is supported only under stated conditions
Entry sits 12 in from the floor, which matters for kittens, senior or arthritic cats
Needs a 22 × 27 in floor area (594 sq in)
Some features are subscription-gated: Whisker+ gates recaps, 2-yr history, behavioural patterns
Uses brand-specific consumables (waste drawer liners, carbon filters, OdorTrap packs)
App-connected: Whisker app; Whisker+ optional
Documented 12-month warranty

What the manufacturer states

Litter compatibility

Litter type	What the manufacturer states
Clumping clay	YesSupported
Tofu	Not rec.Not recommended by manufacturer
Mixed	—Manufacturer does not state
Crystal	Cond.Supported with conditions
Pine pellet	NoNot supported
Other pellet	NoNot supported

MANUAL (outranks product page): 'Never put anything in the unit other than clumping litter or litter beads and crystals that are small enough to pass through the screen.' Translucent/white litter may impact LitterLevel and Drawer Full Indicator accuracy. Lightweight litters such as corn or wheat 'may not pass through the screen effectively'. Do not work: strictly absorbent, non-clumping or loose-clumping, newspaper-based, pine-based, and absorbent wood pellet litter.

Manual https://www.litter-robot.com/manual_pdf/Litter-Robot-4-Manual-EN-DE-FR-IT.pdf

Stated by the manufacturer

Important restrictions

Kittens: kittens under 3 lb require semi-automatic (unplugged) mode

Original PURRINDEX drawings

Dimensions & footprint

Drawn to scale by PURRINDEX from the published dimensions below. An original drawing, not a product likeness and not manufacturer artwork.

Factual list, not a score

Documented mechanisms

lasers
weight sensors
anti-obstruction
SafeCat System / Omnisense

These are the mechanisms the manufacturer documents. PURRINDEX does not rank or score safety, and the number of listed mechanisms is not a measure of anything. Manufacturer

Known unknowns

What the manufacturer does not state

The manufacturer does not publish a waste capacity

Absence of documentation is not evidence of a shortcoming in the product. It is a statement about what you can and cannot find out before buying.

Same decision

Compare with the closest alternatives

Chosen by documented similarity — price band, form factor and the litter types each manufacturer states. Never by what a merchant pays.

Product image: AI-assisted editorial representation, composed by PURRINDEX from documented product characteristics and official visual reference. Not manufacturer photography.

Whisker

Litter-Robot 5 Pro

$600+

You use clumping clay litter — the manufacturer's manual states this is supported
Your heaviest cat is under 30 lb — the stated maximum according to the manufacturer
Entry sits 15.1 in from the floor, which matters for kittens, senior or arthritic cats

You use tofu, pine pellet and other pellet litter — the manufacturer excludes or advises against it

90% documented

View product Compare

Product image: AI-assisted editorial representation, composed by PURRINDEX from documented product characteristics and official visual reference. Not manufacturer photography.

Whisker

Litter-Robot 5

$600+

You use clumping clay litter — the manufacturer's manual states this is supported
Your heaviest cat is under 30 lb — the stated maximum according to the manufacturer
Entry sits 15.1 in from the floor, which matters for kittens, senior or arthritic cats

You use tofu, pine pellet and other pellet litter — the manufacturer excludes or advises against it

83% documented

View product Compare

Product image: AI-assisted editorial representation, composed by PURRINDEX from documented product characteristics and official visual reference. Not manufacturer photography.

Whisker

Litter-Robot EVO

$400–600

You use clumping clay litter — the manufacturer's manual states this is supported
Your heaviest cat is under 19 lb — the stated maximum according to the manufacturer
Entry sits 10.75 in from the floor, which matters for kittens, senior or arthritic cats

You use tofu, pine pellet and other pellet litter — the manufacturer excludes or advises against it

80% documented

View product Compare

Compare these side by side

Commercial layer

Buying options

PURRINDEX chooses the product first. Where you buy it is resolved afterwards and never affects what this site recommends — how that is enforced.

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Every value carries its source

Full evidence

Manufacturer list price: $699.00

Physical

Exterior height: 29.5 in
Exterior width: 22.0 in
Exterior depth: 27.0 in
Unit weight: 24.0 lb
Clearance requirement: Manufacturer does not state

Entry & interior

Entry opening: 15.75 x 15.75
Entry height from floor: 12.0 in
Interior dimensions: inside globe 15.7-16.9 in high (40-43 cm, depending on litter level) x 19.0 in x 18.0 in
Litter bed: 14.0 x 14.0 in (35.5 x 35.5 cm)

Stated cat limits

Minimum cat weight: 3 lb
Maximum cat weight: 25 lb
Stated maximum cats: 4
Kitten restriction: kittens under 3 lb require semi-automatic (unplugged) mode

Waste handling

Waste capacity: Manufacturer does not state
Stated waste interval: Manufacturer does not state
Waste drawer: 5.5 x 13.5 x 9.25 in (14 x 34.3 x 23.5 cm)
Cycle delay: 3-30 min, customizable

Automation & connectivity

Cleaning mechanism: rotating globe, sifting
Power: 15 V DC
Wi-Fi: 2.4 GHz
App: Whisker app; Whisker+ optional
Weight tracking: Yes
Cat identification: weight-based
Notifications: real-time updates
Camera field of view: Manufacturer does not state
Cycle interruption: Manufacturer does not state

Ownership

Proprietary consumables: waste drawer liners, carbon filters, OdorTrap packs
Subscription-gated features: Whisker+ gates recaps, 2-yr history, behavioural patterns
Warranty: 12 months
Trial period: 90 days