The Litter-Robot 4 is the self-cleaning litter box to buy, as long as every cat in the house weighs at least 3 pounds and you can live with spending about $700 on one. It sifts the litter a few minutes after each visit, and Whisker says the drawer can go about eight days between emptyings, although the globe stands 29.5 inches tall and needs a corner to match.
Half that money buys the PuraMax 2, which does the same job and asks you to buy its own waste bags. And if your cat has always used an open box and sits outside anything with a roof, the Neakasa M1 Plus sifts an open tray instead.
You have one to four grown cats, a firm floor, and you'd rather empty a drawer once a week than scoop every day.
Skip it if
A kitten under 3 pounds lives with you and you don't want to run the box by hand until it grows.
After your cat steps out, the globe waits a few minutes for the clumps to set, then turns slowly and sifts them through a screen into the drawer underneath. Whisker rates it for cats from 3 to 25 pounds, Maine Coons included, with an entry 15.75 inches wide, and the base weighs each cat at every visit, so the app shows you who went and how much they weigh.
The free app keeps a week of visits and weights; Whisker+ is an optional paid upgrade for more insights, and the box works fine without it. The carbon filter wants replacing every two to four weeks.
Before you buy it
The footprint is 22 by 27 inches, the height 29.5. It reads your cat's weight best on a hard floor; on a thick rug, Whisker sells a carpet tray.
Where it falls short
About $700, the most here along with the HomerunPet.
The bed inside is round and smaller than a 30-inch open box; a very long cat has more room in the HomerunPet.
2Best value
2. PETKIT PuraMax 2
Weight sensors that tell your cats apart and a low 7.9-inch entry, for about $300.
You want the robot without the Litter-Robot price, or your older cat needs a low step in.
Skip it if
The only spot for the box is on carpet or a mat. PETKIT says to keep it on a flat, hard floor.
Where it falls short
Its waste bags are PETKIT's own rolls, about $11 each.
Not for cats under 6 months old, whatever they weigh.
Read more about the PuraMax 2Show less
The drum is 76 liters inside, the entry is 7.87 inches off the floor, and PETKIT rates it for cats from 3.3 to 22 pounds, with seven infrared sensors and four weight sensors that pause the cycle when a cat comes near.
The 7-liter drawer lasts up to 15 days by PETKIT's count (less with every extra cat), and it takes any clumping litter. The full litter change is the fiddly part: the drum empties through a magnetic attachment that comes in the box, a slower job than tipping a pan into a bag.
3Best open-top
3. Neakasa M1 Plus
An open tray that tips and sifts like a robot, rated for cats up to 33 pounds, with a kitten mode.
Your cat walks away from covered boxes, or weighs more than the Litter-Robot is rated for.
Skip it if
Your cat kicks litter hard. An open tray keeps less of it in than a globe.
Where it falls short
It's bulky for a small bathroom.
The app needs a 2.4 GHz Wi-Fi network.
Read more about the NeakasaShow less
Most robot boxes are domes, and some cats simply won't go in. The Neakasa keeps the open tray they already know and tips it to sift the clumps into a sealed drawer, with a brush strip that closes the gap so smells stay in without carbon packs. It's rated for cats from 3.3 up to 33 pounds and up to three cats, the widest weight range here.
Below 3.3 pounds, Neakasa has you turn on Kitten Mode in its app. The 11.2-liter drawer lasts 7 to 14 days by the maker's count, and the box comes with a two-year protection plan.
4Most room inside
4. HomerunPet CS106
A 106-liter dome with room to turn around, a 12-liter drawer and a reservoir that tops up the litter on its own.
Your cat is a Maine Coon or a Ragdoll, or three cats share one box.
Skip it if
Your cat is stiff in the hips, unless you buy the version sold with a ramp. The step in is high.
Where it falls short
Heavy and big; once it's set up, it stays where it is.
A 12-month warranty, shorter than the Neakasa's two years.
Read more about the HomerunPetShow less
At 106 liters, HomerunPet calls this the largest dome on the market, and it's built for cats up to 25 pounds who need room to turn around before they dig. The 12-liter drawer holds about a week of waste from three cats, and a 4.5-liter reservoir adds fresh litter as the bed runs low, which no other box here does.
It also takes more kinds of litter than the Litter-Robot: clumping clay, tofu, cassava and the mixes of those. A safety bumper and radar back up the weight sensors, and HomerunPet says it's not for kittens under 3.3 pounds or younger than 6 months.
Before you buy it
It measures about 27.4 by 23.6 inches and 28 tall, and weighs 44 pounds empty. Keep the radar at least 2 inches from the wall.
5Best for small spaces
5. Litter-Robot EVO
The Litter-Robot in a smaller size, on the floor space of a large litter pan, and it works on carpet.
You have one or two cats and a small bathroom, or the only floor you've got is carpet.
Skip it if
Your cat weighs more than 19 pounds. Whisker points big cats to the Litter-Robot 4.
Where it falls short
Only $100 less than the Litter-Robot 4, for a smaller box.
Two cats at most.
Read more about the EVOShow less
The EVO is the Litter-Robot made to fit where a large litter pan already sits: 20.6 by 24.3 inches and 27.6 tall. It works the same way, with the same 3-pound minimum and the same app, and Whisker says it can be used on any floor, carpet included.
What you give up is room. The entry is 14.85 inches and the inside 14.5 inches tall, it's rated for two cats instead of four, and the drawer goes up to seven days instead of eight.
For two or three cats, or for anyone whose back hates the daily scoop, yes. The drawer replaces seven scoops with one emptying, and the app keeps each cat's weight for you. For one young cat and an owner who doesn't mind scooping, a big open box and a scoop cost far less.
Best automatic litter box for multiple cats
The Litter-Robot 4 is rated for four cats, the Neakasa for three and the EVO for two, and the HomerunPet's drawer is sized for a week with three. I'd still keep one plain box somewhere else in the house, for the minutes when the robot is mid-cycle or the drawer is full, and for the cat who decides she doesn't like the new machine.
Best automatic litter box for large cats
For a cat over 25 pounds, only the Neakasa is rated for it, up to 33. Up to 25 pounds, the HomerunPet's 106-liter dome gives the most room inside, and the Litter-Robot 4 takes the same weight through a 15.75-inch entry. Leave the EVO and the PuraMax 2 to cats under 19 and 22 pounds.
The safest automatic litter boxes
Every box here holds or pauses its cycle when its sensors detect a cat, and every one has a minimum weight: 3 pounds for both Litter-Robots, 3.3 pounds for the PuraMax 2, the Neakasa and the HomerunPet. Below that, the sensors may miss a small kitten, and a cycle could start with it inside; the anti-pinch designs (an entrance the PuraMax 2 keeps open, a bumper and latch on the HomerunPet, a limited turn on the Neakasa) are the second line of defense, not the first. Whisker's advice for a kitten under 3 pounds is to leave the Litter-Robot switched off, wait about seven minutes after a visit, then turn it on for one cycle; PETKIT and HomerunPet say not to use theirs before 6 months at all, and the Neakasa has a kitten mode.
A self-cleaning box also takes away the daily look at what's in the litter, which is how you'd notice a change in your cat's pee or poop. The app's visit count does part of that job; if your cat starts going outside the box, see the vet before blaming the robot.
Which litter to use in a self-cleaning box
A standard-weight clumping clay suits all five. Whisker says plant litters like corn or pine usually don't sift through the Litter-Robot's screen, and that white or see-through crystals confuse its drawer sensor, so a hard-clumping clay litter like Dr. Elsey's Ultra is the safe fill. The HomerunPet is the one to buy if you'd rather use tofu or cassava.
Cheaper self-cleaning boxes
Under $200, the choice changes: crystal boxes that rake into a disposable tray, and open-top boxes with a rake instead of a rotating drum. They cost less up front; the crystal trays are a refill you keep buying, so add those to the price before you compare. My picks, from a $140 open tray to a box with no motor at all, are in the best self-cleaning litter boxes under $200.
Who this is for
Buy one of these if you'd spend $300 or more never to scoop again, and your cats are grown or close to 3 pounds. If you'd rather keep it simple, a regular litter box that's big enough does most of the job for about $30. Everything else for the box, from litter to mats, is under cat litter and litter boxes.
What to look for in a self-cleaning litter box
A minimum weight your cat clears
Usually 3 to 3.3 pounds. A kitten below that needs the box switched off or in kitten mode.
Room for your cat
Check the maker's top weight and the entry width, not the photo.
A drawer that lasts
The maker's day count is a best case; every extra cat fills it faster. Check what bags it takes.
A full change you can live with
Every few weeks the whole bed comes out. Some boxes make that easy, some don't.
What it costs every month
Filters, bags and, for crystal boxes, trays, bought again every month.
About $340 and it takes any litter, but on PetSafe's own site the same two complaints come back: a rubber mat inside that warps within months and isn't sold on its own, and a drum that stops mid-turn. The PuraMax 2 costs less.
It washes the granules and flushes the waste, so it needs a water line and a drain next to the box. California makes litter brands warn against flushing cat waste, because a parasite it carries reaches the ocean and has been tied to sea otter deaths.
How I picked
Minimum and maximum cat weightRoom insideDays between emptyingsThe litter it takesRunning costs
The five boxes cover five homes: a Maine Coon, a cat who won't use a lid, two cats in a studio, a first robot on a budget. The maker's weight limits came first, since they decide which cat can safely use the box.
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Common questions
Do automatic cat litter boxes really work?+−
Yes, with clumping litter and a cat who accepts the machine. Whisker says over 95 percent of cats get used to the Litter-Robot, most within a week. Plan on emptying the drawer weekly and a full litter change every few weeks.
Is it worth getting a robot litter box?+−
For several cats or for anyone who struggles to scoop every day, yes. For one cat and a daily scoop you don't mind, a big plain box costs far less.
Do vets recommend self-cleaning litter boxes?+−
For a healthy adult cat above the maker's minimum weight, there's no reason not to. What vets point out is that you stop seeing the waste every day, so watch the app's visit count, and see the vet if your cat starts going outside the box.
Can multiple cats use the same automatic litter box?+−
Yes. Each visit leaves a fresh bed for the next cat. Stay under the maker's limit, which runs from two cats to four here.
What is the best and safest automatic cat litter box?+−
For grown cats, the Litter-Robot 4. For a kitten under 3 pounds, the Neakasa M1 Plus, because its kitten mode is built in; with the others you run the box by hand until the kitten grows.
The verdict
The first week with a robot box
If your cat has never met a box that moves, leave the Litter-Robot 4 switched off for the first few days, in the old box's spot, with a cup of the old litter mixed in. Expect a day of her watching it from the doorway; keep the old box nearby until she's used the new one a few times, then put it away.
