Litter Robot 4 Reviews
Quick answer. Disclosure: bestcatgear.com participates in the Amazon Services LLC Associates Program and may earn a commission from qualifying purchases, at no extra cost to you. Check the current price on Amazon. The Whisker Litter-Robot 4 is a self-cleaning litter box that the listing says suits up to 4 cats, each at least 3 lb (1.4 kg), and that the comparison table on a sister listing rates for cats from 3 to 25 lb. It has an app that shows waste and litter levels and logs each cat’s weight, plus a one-year warranty. This page reads what the listing states, not a test. It also covers what the listing leaves out, so you know what to check before you buy.
What the listing states
We opened the Litter-Robot 4 listing (white, “Robot Only” option) on Amazon on 2026-10-17. Every row below comes from that page unless noted.
| Item | What the listing says |
|---|---|
| Model | LR4-0101-00-US, first available July 21, 2022 |
| Warranty | WhiskerCare 1-Year Warranty (in the title) |
| Cats | Suitable for up to 4 cats; each cat must weigh at least 3 lb (1.4 kg) to use Automatic Mode |
| Cat weight range | 3 to 25 lb (from the comparison table on the Litter-Robot EVO listing) |
| Interior headroom | 16.5 inches (same comparison table) |
| Size | 27 x 24.25 x 29.5 inches, 24 pounds (details table); 24 x 24 x 31 inches (overview table). The two do not match. |
| Cleaning | Sifting separates waste from clean litter; you empty the waste drawer when it is full |
| App | Whisker app: waste and litter levels in real time, health insights, and your cat’s weight after each use |
| Odor | Automatic clean cycle plus carbon filters or optional OdorTrap Packs |
| Litter | Works with any clumping litter |
| Other features (comparison table) | Litter level sensing, status display screen, automatic night light, drawer full indicator |
| Noise level | The listing text we read does not state a decibel figure |
| Waste drawer size | Rated “Large” in the comparison table; no liters or gallons stated |
| Cycle time and power use | Not stated |
Worked example: does your cat fit?
The listing sets one hard rule: each cat must weigh at least 3 lb (1.4 kg) to use Automatic Mode. Three households show how the numbers play out against the weight ranges on the listings we opened.
- A 2.5 lb kitten. It is under the 3 lb minimum. The listing does not say what to do before the kitten reaches 3 lb, so check the Whisker manual or ask the seller.
- Two cats of 12 lb and 14 lb. Together they are 26 lb, but the ranges are per cat, not combined. Each is inside the 3 to 25 lb range and inside the Litter-Robot EVO range of 3 to 19 lb.
- A 21 lb cat. It is inside the Litter-Robot 4 range (3 to 25 lb) and outside the EVO range (3 to 19 lb). It is also close to the top of the PETLIBRO Luma limit of 22 lb (2.2 to 22 lb).
Space is the other number. Using the details table, the base is 27 x 24.25 inches, or about 655 square inches. Using the overview table, it is 24 x 24 inches, or 576 square inches. The gap is about 79 square inches, a bit less than a sheet of letter paper (8.5 x 11 inches is 93.5 square inches). Measure the spot with the larger figure. The EVO’s listed footprint is 24.3 x 20.6 inches, about 501 square inches.
Who the listing fits
- Owners of one to four cats, all above 3 lb, who want an app with waste and litter levels and a weight log for each use.
- Owners who already buy clumping litter and do not want to switch to a special type.
- Owners with a larger cat. The 3 to 25 lb range and the 16.5 inch headroom are higher than the EVO’s 19 lb and 14.5 inches.
Who should skip it
- Anyone who needs the machine to sit on carpet and keep an accurate weight. The listing says the scale is most accurate on a firm surface, not carpet or uneven surfaces. The EVO listing says it can be used on any surface, even carpet.
- Anyone who wants a noise figure before buying. This listing gives none.
- Anyone with a kitten under 3 lb.
- Anyone who expects to never touch the box. The listing says you still empty the waste drawer when it is full. “Never scoop again” is the listing’s headline claim, not a promise that you do no cleaning.
What owners say, according to the listing
The listing carries an AI-generated summary of customer reviews. We report it as a listing statement and have not verified it. It says customers find the box functional and like the ease of cleaning, odor reduction and reduced litter use. It says size gets mixed feedback, since some find it compact enough for a closet and others find it very large. It also says durability and value for money are mixed. The size comment fits the table above, where the two size figures disagree. Check the current price on Amazon.
We did not quote individual reviews. Reviews on a retail page are one buyer’s experience, and the listing gives no way to check them.
What the listing claims that cannot be checked here
- “Significantly reduce odors compared to standard litter boxes.” The listing gives no test or number.
- “Health insights” from the app. This site cannot judge them. If your cat’s weight or bathroom habits change, ask your vet.
- “Limits dust” from the sifting design. No figure is given.
- The weight scale’s accuracy. The listing says only that it is most accurate on a firm surface.
Variants and what is in the box
The Litter-Robot 4 is sold under several listings. The one we opened is the white Robot Only option. Its bullets mention a “complimentary fence” and an “included step”, but the search results show a separate black listing titled “with Step & Fence”. We cannot tell from the text whether the white Robot Only listing includes both. Read the “What’s included” section on the exact listing you buy. A separate Supply Bundle listing is titled as including 3 OdorTrap refills. Its full title is cut off in the search results, so check the listing for the rest.
View the Litter-Robot 4 on Amazon
Alternatives with listing specs
Whisker Litter-Robot EVO
Choose it if: you have one or two cats under 19 lb and want a smaller footprint.
Listing specs (checked 2026-10-17): model LRE-0301-00-US, one-year manufacturer warranty, 24.3 x 20.6 x 27.6 inches, 21.5 pounds. Up to 2 cats, 3 to 19 lb each, 14.5 inch headroom and a medium drawer. The comparison table marks litter level sensing and the automatic night light as “no”, where the Litter-Robot 4 has both. The bullets say it can be used on any surface, even carpet.
View the Litter-Robot EVO on Amazon
PETLIBRO Luma
Choose it if: you want an open-top box with a camera and a higher cat count.
Listing specs (checked 2026-10-17): model PLLB001, 24-month warranty, 23.3 x 22.5 x 28.1 inches, 33.1 pounds. The listing says up to 10 cats at 2.2 to 22 lb each. It claims AI camera waste analysis, multi-cat recognition and a fan with a carbon deodorizer. We do not repeat its odor percentage or its waste-analysis health claims, since we cannot check them.
View the PETLIBRO Luma on Amazon
FAQ
How many cats can the Litter-Robot 4 handle?
The listing says it is suitable for up to 4 cats, each at least 3 lb (1.4 kg) to use Automatic Mode. The EVO is listed for up to 2 cats.
What is the warranty?
The title states a WhiskerCare 1-Year Warranty. The EVO listing shows a one-year manufacturer warranty and the PETLIBRO Luma shows 24 months.
Does it work with any litter?
Any clumping litter, according to the title. No brand names are given.
Do I still have to empty it?
Yes. The listing says to empty the waste drawer when it is full. It does not give the drawer size in liters or how many days that takes.
Can it go on carpet?
The listing says the weight scale is most accurate on a firm surface, not carpet or uneven surfaces. It does not say the box cannot be used on carpet. For comparison, the EVO listing says that model can sit on any surface, carpet included.
How loud is it?
The listing text we read gives no decibel figure, so we cannot say. Look at the listing’s video and questions before you buy.
