Neakasa M1 vs Litter-Robot 4: Open-Top or Globe?

The Neakasa M1 and the Litter-Robot 4 solve the same problem in opposite ways. The M1 is an open bowl with no hood, rated for cats from 2.2 to 33 lb, for about $360–450. The Litter-Robot 4 is a hooded globe rated from 3 to 25 lb and up to four cats, for about $699–749. Pick the M1 for a very large cat or one that refuses hooded boxes. Pick the Litter-Robot 4 for several cats and a cleaner floor.

We haven’t tested either box ourselves. This comparison uses Neakasa’s and Whisker’s published specs, Amazon listing text, and hands-on results from Tom’s Guide and WIRED, and we name the outlet each time. Prices are typical street prices from dated sources, not live Amazon prices, so check today’s price before you buy.

Neakasa M1 vs Litter-Robot 4 specs

For every box side by side, see the comparison chart.

Open-top vs globe: how they work

The Litter-Robot 4’s globe rotates slowly after each visit. Clumps drop through a screen into a sealed drawer underneath, and clean litter returns to the bed. The hood keeps litter inside, and the entry stays open throughout.

The M1 has no hood. It’s an open bowl that tilts or rotates to sift clumps into the bin below. Tom’s Guide notes it also flips the container to dislodge stuck clumps. With no roof and no door, there’s nothing for a cat to squeeze through, and nothing to close.

That one difference drives most of the trade-offs below: the M1 is more open for the cat and messier for you.

What Tom’s Guide’s usage counts show

Tom’s Guide’s John Velasco tracked how often his cats used each of four robotic boxes. In one week, they used the Neakasa M1 51 times and the Litter-Robot 4 30 times. The LR4’s count was almost triple that of Leo’s Loo Too.

Read that carefully. It’s one household’s cats over one week, so it measures preference, not cleaning quality or safety. Still, preference matters. A box your cat avoids does nothing for you, and it’s a sign the cat is going somewhere else. For a cat that has refused a hooded box before, the M1 is the better bet. Whisker, for its part, claims “over 95% of cats acclimate” to the Litter-Robot 4, based on its return reasons.

Whichever you choose, keep the old box out until your cat uses the new one reliably. Our transition guide covers the steps.

Large cats

This is the M1’s strongest case. Neakasa recommends it for cats from 2.2 to 33 lb and says the open top has almost no hard weight limit. WIRED measured the M1 Plus’s opening at 17 × 16.5 in. There’s no ceiling for a tall cat to hunch under.

The Litter-Robot 4 is no slouch. Its 15.75 in square entry and 16.5 in interior height fit most large breeds, and Whisker rates it to 25 lb. Above that, the M1 or the Litter-Robot 5 (rated to 30 lb) are the options.

One thing to check for older cats: Neakasa lists the M1’s entry height as 13.86 in, so look at how high your cat will need to step before you buy. Run your cat through the safety checker with their weight and mobility, and see our large-cat guide.

Scatter and mess

The open top has a cost. Tom’s Guide found the M1’s open design scatters litter, though the box includes a netted mat. WIRED also flagged scatter on its M1 Plus. Plan on a big mat such as the Gorilla Grip 40 × 28 in or the iPrimio jumbo mat, and a quick daily sweep.

The Litter-Robot 4’s hood keeps more litter inside, and Whisker sells its own LitterTrap mat ($50). Our mats and supplies page compares options.

Odor and emptying

Neakasa claims an 11.23 L bin that lasts up to 14 days for one cat. WIRED’s experience with the M1 Plus was shorter: it could smell waste after about five days, and wet litter stuck to the back grate.

The Litter-Robot 4 uses a sealed drawer with a carbon filter and optional OdorTrap packs, which Whisker says to replace every 2–4 weeks. Whisker says the drawer may need emptying as rarely as once every 8 days. Tom’s Guide noticed the LR4 could keep cycling after the app said the bin was full, so empty it on schedule. Our odor fixes apply to both.

Safety

Both boxes pass the first test: nothing closes on the cat. The M1 has no hood or door. The Litter-Robot 4’s entry stays open while the globe turns, and WIRED only recommends boxes that stay open during cycling.

Sensing differs. Neakasa uses five pairs of infrared sensors and four weight sensors on the M1, and six infrared pairs on the M1 Plus. Whisker pairs a laser curtain with weight sensors.

For small cats, the M1’s 2.2 lb minimum is lower than the LR4’s 3 lb. Below those weights, both makers say to stop automatic cleaning: Neakasa’s Kitten Mode turns it off, and Whisker says to run the LR4 in semi-automatic mode, powered off and cycled by hand. See our kitten guide.

The original M1’s problems and counterfeit listings

WIRED didn’t recommend the original M1 because of controversies over safety, faulty sensors and counterfeit models. It picked the upgraded M1 Plus as its best open-top box instead, citing an improved app, a kitten mode and support for cats from 2.2 lb up to 33 lb.

Counterfeits are a separate, ongoing problem. Neakasa published a notice, updated June 22, 2026, warning about fake M1 listings and fraudulent sellers. To protect yourself:

• Buy from a listing sold by Neakasa or its official storefront.
• Check the seller name, not just the product title.
• Be wary of a price far below the usual $330–450 range.
• Check the version. The standard M1 listing we link is not the M1 Plus.

M1 vs M1 Plus vs M1 Lite

Our pick is the M1 Plus if the price gap is small on the day, since it’s the version WIRED tested and recommended. The Lite’s missing mat matters more than it sounds on an open-top box.

Apps

WIRED likes Whisker’s app, which tracks visits and weight and warns about litter level and drawer status. Tom’s Guide found it tells cats apart by weight.

WIRED found Neakasa’s app poorly translated, with no multi-cat history. It said the M1 Plus app is improved. If you track multiple cats’ visits for health reasons, the Litter-Robot 4 is the stronger tool.

Reliability

The Litter-Robot 4 has a long test record with known flaws. WIRED’s unit sometimes sensed “ghost cats” and reported a full drawer when half full after nearly two years. Tom’s Guide’s unit, used for more than a year, was still holding up but sometimes squeaked, so it needs regular maintenance. The M1’s track record includes the original model’s faulty-sensor complaints noted by WIRED. Our troubleshooting guide covers common fixes for both.

Running costs

With our default assumptions (about 10 lb of clumping litter per cat per month at $0.57 a pound), one cat costs about $121 a year in an M1 and about $177 in a Litter-Robot 4. Over five years, box included, that’s about $960 against $1,580. The M1 figure uses a $1-per-bag stand-in price, and generic bags that fit the M1 may be cheaper. Neakasa also sells its own mineral litter. Run your own numbers in the cost calculator.

Who should buy which

The litter box matcher narrows it further. More open-top options are in our best open-top guide, and other non-Whisker picks are in Litter-Robot alternatives.

Verdict

Buy the Neakasa M1, ideally the M1 Plus, if your cat is very large or won’t use a hooded box. It’s about half the price of a Litter-Robot 4, its range runs to 33 lb, and Tom’s Guide’s cats chose it most often. Accept the scatter, buy a big mat and purchase only from a listing sold by Neakasa.

Buy the Litter-Robot 4 if you have several cats, want a cleaner floor and value Whisker’s app and support. It’s rated for up to four cats, uses a laser curtain plus weight sensors, and held up through more than a year of use at Tom’s Guide, with the caveats WIRED found as it aged.

Check today’s Neakasa M1 price or Litter-Robot 4 price before you decide.