Whisker Litter-Robot 4 vs Whisker Litter-Robot 5 Pro
Researched by Riley Hart · prices checked Oct 26, 2026
As of Oct 26, 2026, the Whisker Litter-Robot 4 costs $699 and the Whisker Litter-Robot 5 Pro costs $999, so the Whisker Litter-Robot 4 is $300 cheaper. The Whisker Litter-Robot 5 Pro has a published review score and ranks #10 in our self cleaning litter boxes ranking; the Whisker Litter-Robot 4 is not scored yet. Pick the Whisker Litter-Robot 4 for one to four average size cats. Pick the Whisker Litter-Robot 5 Pro for multi cat homes wanting health tracking.
- Cat weight
- 3 to 25 lb
- Max cats
- Up to 4
- Litter
- Clumping clay
- Waste drawer
- Sealed
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 →- Cat weight
- 3 to 30 lb
- Max cats
- Up to 5
- Litter
- Clumping clay
- Waste drawer
- Sealed
The most complete self cleaning box we list, aimed at multi cat homes that want to see who used the box and track weight trends. If you do not need cameras, the Litter-Robot 5 does the same cleaning for $100 less, and some smart features sit behind a monthly membership.
Full Whisker Litter-Robot 5 Pro review →Side by side
| Whisker Litter-Robot 4 | Whisker Litter-Robot 5 Pro | |
|---|---|---|
| Price | $699 | $999 |
| 3 year cost | $1,035 | $1,155 |
| Our score | Not scored yet | 6.4/10 |
| Rank in Litter box | #16 | #10 |
| Status | on sale | on sale |
| Warranty | 1 year (WhiskerCare), extendable to 3 years; 90 day in home trial | 1 year (WhiskerCare), extendable to 3 years; 90 day in home trial |
| Cat weight range | 3 to 25 lb (kittens under 3 lb need semi automatic mode) | 3 to 30 lb |
| Max cats | Up to 4 | Up to 5 |
| Waste drawer | Sealed drawer with carbon filter, as little as once every 8 days (maker claim) | Sealed drawer with carbon filter, about 10 days between emptyings for one cat (maker claim) |
| Sensors | Laser and weight sensors, SmartScale cat weight tracking, SafeCat system | Multiple lasers, SmartScale weight sensing, WasteID urine vs stool detection, SafeCat system |
| App | Whisker app (2.4 GHz WiFi); free 7 day view, Whisker+ optional | Whisker app; dual 1080p night vision cameras; Whisker+ optional at $7.99/month |
| Litter type | Clumping clay recommended; crystals only if they pass the screen; plant based and pellet litters not recommended | Clumping clay recommended; crystal, plant based, paper and pellet litters not recommended |
| Size | 22 x 27 in footprint, 29.5 in tall, 15.75 x 15.75 in entry, 24 lb empty | 22 x 27 in footprint, 29.9 in tall, 15.75 x 15.75 in entry, 29.6 lb empty |
| Noise | No dB rating published; QuietSift motor | No dB rating published; QuietSift motor |
| Best for | one to four average size cats | multi cat homes wanting health tracking |
| Skip if | your cat is over 25 lb | you do not want a subscription or cameras |
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 Pro
- Cats.com: Named Overall Best in its October 2026 roundup of 38 tested models. Source
- Cats.com (4.6/5): Odor control and sifting matched the Litter-Robot 4; reviewer could not test facial recognition without Whisker+ and questioned whether cameras justify the extra $100. Source
- 9to5Toys: Quieter and sturdier than the Litter-Robot 4 with better odor control; bin full alert sometimes fired at about half capacity and urine was sometimes labeled as solid waste. 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 Pro
Pros
- Supports up to 5 cats from 3 to 30 lb
- Dual cameras plus weight based cat tracking
- Large sealed drawer, about 10 days for one cat
- 90 day trial from Whisker
Cons
- Most expensive box in this list
- Facial recognition and long history need Whisker+
- Settings change only in the app
- Reviewers report early bin full alerts and some urine mislabeled as stool
Questions buyers ask
Which is better, the Whisker Litter-Robot 4 or the Whisker Litter-Robot 5 Pro?
The Whisker Litter-Robot 5 Pro has a published review score and ranks #10 in our self cleaning litter boxes ranking; the Whisker Litter-Robot 4 is not scored yet. Pick the Whisker Litter-Robot 4 for one to four average size cats. Pick the Whisker Litter-Robot 5 Pro for multi cat homes wanting health tracking.
Which is cheaper?
The Whisker Litter-Robot 4 at $699, versus $999 for the Whisker Litter-Robot 5 Pro, checked Oct 26, 2026. Over 3 years with running costs: $1,035 vs $1,155.
What is the difference between the Litter-Robot 4 and the Litter-Robot 5 Pro?
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 Pro. Max cats: Up to 4 on the Litter-Robot 4, Up to 5 on the Litter-Robot 5 Pro. 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, about 10 days between emptyings for one cat (maker… on the Litter-Robot 5 Pro.
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