Overview
The Litter-Robot EVO is Whisker’s compact take on its rotating-globe litter box. It works the same way as the bigger models: once your cat leaves, a timer runs, the globe turns, and clumps drop through a screen into a drawer underneath. Whisker designs it for up to two cats weighing 3 to 19 lb, and it is about 2 in shorter and a few pounds lighter than the Litter-Robot 4. Whisker says it is designed and assembled in the US and sold in the US and Canada only.
The two Amazon stores list it differently. Amazon.ca uses ASIN B0HCRT82HY for the black EVO, and Amazon.com uses B0G6GDC4VN, the black robot-only version. Whisker’s own robot-only package includes a step, fence, power supply, five liners and one carbon filter; confirm the included items on whichever listing you use.
Key features
- For 1–2 cats weighing 3–19 lb; kittens under 3 lb need semi-automatic mode
- Footprint 20.6 x 24.3 in, 27.6 in tall; 14.85 x 14.85 in entry; 21.5 lb empty
- Weight sensors and Whisker’s SafeCat anti-obstruction system; drawer-full indicator
- QuietSift motor, which Whisker describes as nearly silent; cycle delay adjustable from 3 to 30 minutes
- Clumping clay recommended; crystals can work if they pass the screen; no pellets, paper or plant-based litter
- 2.4 GHz Wi-Fi only; free Whisker app with weight-based cat ID and 7 days of history
- Drawer lasts up to about 7 days for one cat, per Whisker
Who it suits (and who should skip it)
The EVO fits one- or two-cat homes with average-size cats and limited floor space, where the Litter-Robot 4 would feel oversized. It gives you the Whisker app, weight logging and the same warranty structure at a lower price point than the LR4. Vetstreet’s reviewer found it quieter and less error-prone than the older Litter-Robot 3 Connect.
Skip it if any of your cats is over 19 lb or likely to get there, or if you have three or more cats. It has no litter-level sensing and no entry motion sensors; the same Vetstreet review noted the scale can misread when a cat perches on the entry, which pauses the cycle. Hood-shy cats may also prefer an open design.
Costs to know about
No subscription is needed. The free app shows device status, visits and a week of weights, while optional Whisker+ adds daily recaps and long-term trends. Budget for liners (one each time you empty), carbon filters and OdorTrap packs, which Whisker suggests replacing every 2 to 4 weeks, plus clumping litter. Whisker includes a 1-year warranty and offers 3-year coverage as an add-on. Its 90-day trial applies to Whisker’s own store, where the buyer pays return shipping.
How it compares
The Litter-Robot 4 is the step up for bigger cats or busier boxes, with a 25 lb ceiling and litter-level sensing. If budget matters more than the Whisker name, the PETKIT PuraMax 2 covers cats up to 22 lb, has a larger 7 L bin and an always-open entrance. See every option side by side in our smart litter box guide.
Pros and cons
What we like
- Smaller and lighter than the Litter-Robot 4
- Same Whisker app, weight-based cat ID and warranty structure
- Quieter motor and adjustable cycle delay
- Sold in both the US and Canada, per Whisker
Watch out for
- 19 lb cat limit and two-cat maximum
- No litter-level sensing or entry motion sensors
- Scale can misread a cat perched on the entry
Our rating: 4.3/5
| Build quality | 4.5 |
|---|---|
| Ease of use | 4.4 |
| Safety & trust | 4.4 |
| Value | 4.1 |
| US & Canada availability | 4.3 |
Our rating is an editorial score based on the brand's published specs, independent reviews, safety and trust signals, value and availability in the US and Canada. It is not Amazon's customer rating, and brands do not pay for placement.
Frequently asked questions
What is the difference between the Litter-Robot EVO and Litter-Robot 4?
The EVO is smaller (27.6 in tall versus 29.5 in) and lighter, and it costs less. The Litter-Robot 4 adds a laser curtain, litter-level sensing and a higher weight range of 3 to 25 lb, compared with 3 to 19 lb and a two-cat maximum for the EVO. Both use the Whisker app and the same rotating-globe cleaning method.
Are the Amazon.ca and Amazon.com EVO listings the same?
They use different ASINs. Amazon.ca lists the black EVO as B0HCRT82HY, and Amazon.com lists the black robot-only version as B0G6GDC4VN. Check the included-items section on the Canadian listing, since bundle contents can vary between stores.
Can I use crystal litter in the Litter-Robot EVO?
Whisker recommends clumping clay. It says silica gel crystals can work if they pass through the screen, but it does not recommend translucent or white litter because it can affect the drawer-full indicator. Plant-based, non-clumping, newspaper and wood pellet litters are not recommended.
Does the EVO work on 5 GHz Wi-Fi?
No. Whisker says the EVO connects on 2.4 GHz only. If your router broadcasts one combined network name for both bands, you may need to enable a separate 2.4 GHz network during setup. The robot still cleans on its own schedule without Wi-Fi; you just lose the app features.
This page is general information, not veterinary advice. Check with your vet before changing your pet's food or adding a supplement.
