So, you’re ready to join the no-scoop life and give your routine a major upgrade with a self-cleaning litter box (great choice). Maybe you’re already familiar with Litter-Robot 4, the highest-rated automated litter box on the market, but you’re a new cat parent, short on space, or just looking for something a little more compact. In that case, meet one of Whisker’s newest models: Litter-Robot EVO. It just might be the perfect fit for you.
While Litter-Robot 4 is a tried-and-true option with over 10,000 5-star reviews since its debut in 2022, Litter-Robot EVO brings a fresh, streamlined design that fits effortlessly into smaller spaces, just like your cat.
How different are Litter-Robot 4 and Litter-Robot EVO? Let’s dig into the design, features, performance and technology in our comparison of Litter-Robot 4 vs Litter-Robot EVO below.
In this article
- Litter-Robot® 4 vs EVO at-a-glance
- Core features of Litter-Robot® 4 and EVO
- Inner workings
- Design evolution
- Display and accessories
- Conclusion
Litter-Robot® 4 vs EVO at-a-glance
If you’re looking for a simple way to compare Litter-Robot 4 vs EVO, check out our infographics below and our complete Litter-Robot comparison page to find out which is the best Litter-Robot for you.
| Litter-Robot 4 | Litter-Robot EVO | |
|---|---|---|
| Price – MSRP | $699 | $599 |
| Number of cats supported | 4 cats | 2 cats |
| Weight limit | 3–25 lbs | 3–19 lbs |
| Dimensions | 22’’ x 27’’ x 29.5” | 20.6’’ x 24.3’’ x 27.6” |
| Waste drawer capacity | Empty every ~8 days for 1 cat | Empty every ~7 days for 1 cat |
| LitterLevel® sensing | ✓ | - |
| LCD color screen | - | ✓ |
| Use on any type of flooring | Carpet Tray add-on | ✓ |
| LitterHopper autofill accessory compatibility | ✓ | - |
At $599, the Litter-Robot EVO comes in at a lower price than Litter-Robot 4, which starts at $699. Think of Litter-Robot EVO as a more compact, simplified version of Litter-Robot 4—easy to use, easy to love, and perfect if you’re just getting started with an automatic litter box. It’s a great fit for households with one or two cats.
Litter-Robot 4, on the other hand, is built for bigger multi-cat homes. It can handle up to four cats and adds more advanced features like litter- and waste-level sensing. Plus, it’s compatible with premium add-ons such as the LitterHopper and the Shield.
Core features of Litter-Robot® 4 and EVO
Size matters
If you’re short on space, you already know how carefully you have to think before bringing anything new into your home. That’s where Litter-Robot EVO shines. It can fit just about anywhere, better than a traditional litter box ever could.
Compare the dimensions below:
Litter-Robot EVO
- Height: 27.6”
- Footprint: 20.6’’ x 24.3’’
- Entryway: 14.85’’ x 14.85”
- Headroom (interior): 14.5”
- Weight (empty): 21.5 lbs
Litter-Robot 4
- Height: 29.5”
- Footprint: 22’’ x 27’’
- Entryway: 15.75’’ x 15.75”
- Headroom (interior): 16.5”
- Weight (empty): 24 lbs.
The more compact design of Litter-Robot EVO does mean a slightly smaller waste drawer compared to Litter-Robot 4, so you may need to empty it a bit more often. For many small-space homes, though, that’s a simple trade-off for a better fit.
How many cats can it support?
Litter-Robot EVO can support up to two cats, while Litter-Robot 4 supports up to four cats.
App insights
In app insights as well as core features, Litter-Robot EVO is a more streamlined, simplified version of Litter-Robot 4. In addition to important robot status notifications, Litter-Robot EVO notifies you through the Whisker app when your waste drawer is full and needs to be emptied. Litter-Robot 4, on the other hand, offers more advanced insights, such as LitterLevel® sensing, that lets you know when it’s time to add more litter.
Cleaning cycles
Litter-Robot EVO features a spacious waste drawer that typically needs to be emptied about once every seven days for a single cat. Litter-Robot 4 has a slightly larger waste drawer, stretching that time to about eight days for one cat.
Both models are powered by QuietSift® technology to keep self-cleaning cycles whisper-quiet, making them a great choice for noise-sensitive or skittish cats.
Shop Whisker automatic litter boxes
Inner workings
LitterLevel® sensing
Both models are designed to make daily litter box upkeep easier, but Litter-Robot 4 offers a few extra smart upgrades. It includes LitterLevel® sensing, which keeps an eye on how much litter is left and lets you know when it’s time to top it off—something Litter-Robot EVO doesn’t offer.
Waste level sensing
When it comes to waste monitoring, both models have you covered, but in slightly different ways. Litter-Robot EVO keeps things simple by notifying you when the waste drawer is full or almost full, while Litter-Robot 4 provides more detailed waste-level sensing for added peace of mind. Its larger waste drawer also means more time between emptying compared to Litter-Robot EVO.
Weight capacity
SmartScale—the Litter-Robot built-in weight scale—uses integrated weight sensors to weigh your cat and display trends over time within the Whisker app.
Litter-Robot EVO supports kittens and adult cats weighing 3-19 lbs. For Litter-Robot 4, cats can weigh 3-25 lbs, meaning it’s better for larger cats.
Design evolution
Custom bezels
With Litter-Robot 4, you can swap in custom bezels to better match your style and space. Litter-Robot EVO keeps things simple with a clean, streamlined design—no extras, just smart simplicity.
Smaller size
All Litter-Robot models are designed to fit seamlessly into your space, whether you want it to blend in or stand out. Thanks to its smaller, compact footprint, Litter-Robot EVO can easily squeeze into more places—just like your cat.
Integrated Carpet Tray
Litter-Robot EVO can be placed on any type of flooring, including carpet and rugs, thanks to a built-in carpet tray; there is no need for additional accessories.
If you use Litter-Robot 4 on carpet or uneven flooring, we recommend purchasing a Carpet Tray accessory to improve the accuracy of SmartScale weight readings.
Display and accessories
LCD display for easier monitoring
A full color LCD display makes it easy to onboard and receive real-time updates on Litter-Robot EVO. Follow prompts, see your cat’s weight (upgrade to Whisker+ for more detailed information on cat weight), and get information about your cats’ visits all through the easy-to-read screen.
The LCD display makes it easier to understand what’s going on with your robot if you encounter any errors during operation—no more having to decipher light bar codes.
Accessories: LitterHopper, Shield & Ramp
Whisker offers optional accessories for Litter-Robot that make life with your cat even easier. Just note, several of these add-ons are designed for Litter-Robot 4 and aren’t compatible with Litter-Robot EVO.
The Litter-Robot 4 Shield is the ultimate match for cats who kick and dig. It easily attaches to the front of your automatic litter box, adding a protective barrier to keep litter in and other nosy pets out. Plus, it gives your cat (and you) a little extra privacy while they’re handling their business, making it perfect for skittish cats.
Another litter box chore bites the dust: With Litter-Robot 4, your self-cleaning litter box can be self-refilling, too. The Litter-Robot 4 LitterHopper® refills litter to optimal levels, so you don’t have to.
Both Litter-Robot EVO and Litter-Robot 4 can be fitted with a ramp to help cats enter and exit their robots with ease. The Litter-Robot EVO Ramp features a slotted surface to help minimize the spread of litter.
Night light
Late-night bathroom break? No problem. Litter-Robot 4 includes an automatic LED night light that illuminates the litter bed, benefiting your cat in the dark. This feature is not included on Litter-Robot EVO.
Conclusion
Ultimately, Litter-Robot EVO is a favorite for squeezing into smaller spaces and effortlessly fitting right into your life, especially if you’re a new cat parent or a one- to two-cat household. On the other hand, Litter-Robot 4 levels up the features that make Litter-Robot EVO a success with:
- LitterLevel® sensing
- More advanced waste level sensing
- Slightly larger interior globe space
- Slightly larger waste drawer size (for less frequent emptying)
- Night light
- LitterHopper and Shield compatibility
- Expanded cat weight range of 3-25 lbs
- Accommodations for up to 4 cats
Whichever Litter-Robot model you choose, one thing is for certain: your days of scooping are over. Instead, you’re getting a thoughtfully designed, high-quality product that provides your cat with a fresh bed of litter every time.
