Litter-Robot EVO specs
| Brand | Whisker |
|---|---|
| Mechanism | Rotating globe |
| Cat weight (automatic mode) | 3–19 lb |
| Cats per box | Up to 2 |
| Kittens & small cats | Under 3 lb: semi-automatic mode until the kitten reaches 3 lb (Whisker). |
| Safety sensors | Weight. Whisker says the EVO relies on weight sensors to detect a cat entering and leaving. |
| Entrance during cleaning | Stays open. One of WIRED's picks, all of which stay open during cycling. |
| Litter | Clumping. Clumping or scoopable clay; translucent or crystal litter may affect level monitoring (WIRED). |
| Waste drawer | WIRED's single-cat tester emptied the drawer about once a week. |
| Entry | 14.85 × 14.85 in. 14.85 × 14.85 in entry, 14.5 in interior height (Whisker). |
| Footprint | 20.6 × 24.3 in, 27.6 in tall |
| Unit weight | 21.5 lb |
| App / Wi-Fi | Yes (Wi-Fi (Whisker app)) |
| Odor control | Tightly sealed waste drawer and carbon filter. |
| Consumables | Litter-Robot liners and carbon filters, same pricing as the LR4. |
| Warranty | 1 year |
| Price tier | $$$ Premium ($550–$799). $599 at Whisker (Nov 12, 2026) and $599 at Amazon in WIRED's Nov 6, 2026 price box. |
Running costs: with our defaults, consumables for one cat come to about $9.00 a month plus litter. See the full breakdown in the cost calculator.
Versions and bundles
Each option is a separate Amazon listing. Prices, where shown, are dated snapshots, not live prices.
| Option | What's different | Price |
|---|---|---|
| Litter-Robot EVO, black | Our pick: robot only | Check price |
| Litter-Robot EVO, white | Same robot in white | Check price |
| EVO Bundle, black | Adds a litter mat and a supply kit | Check price |
Specs are compiled from manufacturer pages, Amazon listings and independent reviews and can change between production runs. Confirm the weight range and what's in the box on the Amazon page before buying.
We haven’t tested the Litter-Robot EVO ourselves. This review draws on WIRED, which named it the best automatic litter box for small spaces after testing it with one cat, plus Whisker’s specs and the Amazon listing.
The EVO is the compact Litter-Robot. It uses the same rotating-globe idea and the same Whisker app as the Litter-Robot 4, in a 20.6 × 24.3 in footprint that’s close to a large manual box. It costs $599 at Whisker, and WIRED’s November 6, 2026 price box showed $599 at Amazon, $100 less than the LR4. Check the price before you buy.
Who it’s for (and who should skip it)
It’s for one- or two-cat apartments with average-size cats, where floor space is tight but you still want a Litter-Robot. WIRED found it nearly silent with virtually no odor, and its cat took to it quickly.
Skip it if any cat weighs more than 19 lb or you have three cats. Those limits are firm, and the Litter-Robot 4 covers up to four cats to 25 lb. Skip it too if you want automatic litter refilling, which the EVO doesn’t support. If you’d rather spend less, the PETKIT PuraMax 2 costs about $390 and also keeps its entrance open while cycling. Our Litter-Robot 5 vs 4 vs EVO comparison lays out the Whisker range.
How it cleans, and how safe it is
After your cat leaves, the globe rotates to sift clumps into a sealed drawer below. Whisker says the EVO relies on weight sensors to detect a cat entering and leaving. There’s no laser curtain like the one on the LR4 and LR5, which is the main safety trade for the lower price.
The EVO is one of WIRED’s picks, and WIRED only recommends boxes that stay open during cycling. That’s the most important safety feature in a globe box. WIRED’s position is blunt: it won’t recommend devices that close completely, because the machine might not sense the cat.
Because detection depends on weight, the 3 lb minimum matters. Under 3 lb, Whisker says to use semi-automatic mode: leave the robot off and run cycles yourself. Check your cat against the EVO’s limits with the cat safety checker. For kittens in general, see best self-cleaning litter box for kittens.
Living with it
Fit and entry
The entry is 14.85 × 14.85 in with 14.5 in of interior height, a little smaller than the LR4’s 15.75 in square entry and 16.5 in headroom. The box is 27.6 in tall and weighs 21.5 lb. For most cats under 19 lb that’s plenty of room.
Litter and emptying
Use clumping or scoopable clay. WIRED’s single-cat tester emptied the drawer about once a week. Unlike the LR4, the EVO has no litter-level sensing, so check the bed and top it up by hand.
Quirks WIRED found
WIRED’s unit arrived without the drawer liners it should have included, so have some on hand. WIRED also saw waste sometimes stick to the inside of the globe’s ceiling, which means wiping it down now and then. Neither is a dealbreaker, but both mean a little more hands-on time than the marketing suggests. Our odor fixes guide covers cleaning routines that help.
App
It uses the same Whisker app as the bigger robots, with usage and weight tracking.
Running costs
The EVO uses Litter-Robot liners and carbon filters at the same prices as the LR4. Here’s our cost model at Whisker’s prices:
| Item | Price (source) | Our usage assumption |
|---|---|---|
| Drawer liners | $25 for 25 (Whisker) | about 4 per cat per month |
| Carbon filters | $30 for 6 (Whisker) | 1 per cat per month |
| Clumping clay | $22.99 for 40 lb (Chewy) | 10 lb per cat per month |
That’s about $14.75 a month, or roughly $177 a year, for one cat. Over five years, with the robot at $599, we estimate about $1,484 for one cat and about $2,369 for two. Those consumables cost the same as an LR4’s, so the EVO’s whole saving is the $100 lower purchase price. Run your own numbers in the cost calculator.
What you’ll need beyond the box
- Litter: Dr. Elsey’s Ultra unscented, 40 lb.
- Liners: Litter-Robot drawer liners, 25-pack. Order these with the robot, given WIRED’s missing-liner experience.
- Cleaning: Whisker’s cleaning supply kit (about $85 in a listing snapshot) includes wipes, liners, spray and OdorTrap refills. The carbon-filter packs on Amazon are listed for the LR4, so check Whisker’s site for the EVO’s filter.
- Mat: a Gorilla Grip 35 × 23 in mat.
The EVO also comes in white, and an EVO Bundle adds a litter mat and a supply kit. The robot carries a one-year warranty.
Bottom line
The EVO is the Litter-Robot to buy for one or two average-size cats in a small home. WIRED found it quiet and odor-free, it fits close to a manual box’s footprint, and it keeps its entrance open while cycling. The limits are real: two cats, 3–19 lb each, weight sensing only, and no LitterHopper. Within those limits it’s the best-value Whisker robot, and the litter box matcher can confirm it fits your home. See today’s EVO price.
Litter and supplies for the Litter-Robot EVO
Litter, liners, odor refills and mats sold on Amazon that fit this box. Check the listing confirms your exact model before you buy.
- Liners & bagsLitter-Robot waste drawer liners by Whisker, 25-packOfficial Whisker
Custom-fit 9–11 gallon liners; Whisker's white redesign gives more accurate drawer-level readings. The Amazon listing showed as unavailable in one snapshot; Whisker's cleaning supply kit also includes 25 liners.
- Supply kitWhisker Litter-Robot cleaning supply kit: 30 wipes, 25 liners, spray, 6 OdorTrap refillsOfficial Whisker
A few months of liners and odor packs plus the cleaner Whisker recommends for the globe.
- LitterDr. Elsey's Ultra unscented clumping clay cat litter, 40 lbCompatible, third-party
Unscented, hard-clumping, standard-weight clay: the type Whisker recommends and most globe and drum boxes are tuned for. Not for ScoopFree crystal trays. Check your box's sifter: PETKIT asks for granules under 0.5 in.
- Litter matGorilla Grip cat litter mat, 35 × 23 inUniversal fit
Big enough to catch scatter from most globe boxes; textured backing stays put.
- Litter matGorilla Grip cat litter mat, extra large, 40 × 28 inUniversal fit
The size we'd put under open-top boxes, which both WIRED and Tom's Guide found fling more litter.
- Litter matiPrimio jumbo cat litter trapper mat, 32 × 30 inUniversal fit
Honeycomb two-layer mat with a waterproof layer, for cats that kick litter far.
Compatibility checked November 2026. More in our litter and supplies guide.
Featured in our guides
- The 8 Best Self-Cleaning Litter Boxes of 2026, Ranked for Safety and Value
- The Best Self-Cleaning Litter Box for Multiple Cats in 2026
- The Best Self-Cleaning Litter Box for Small Spaces, by Real Footprint
- Best Self-Cleaning Litter Box for Kittens (and Why Most Aren't Safe Yet)
