Side-by-side research
AS11 vs Litter-Robot 4 vs PuraMax 2 vs Neakasa M1 Plus
Compare the four finalists using the same factors and source-labeling standard.
Researched and edited by Sifted Paws Editorial TeamResearch-based review; no hands-on testing is claimed unless specifically stated.
| Factor |  AS11 AutoScooper 11 |  Litter-Robot 4 |  PuraMax 2 |  Neakasa M1 Plus |
|---|---|---|---|---|
| Design | Open-top rolling/sifting design | Enclosed rotating globe | Enclosed rotating cylinder with low entrance | Open-top rolling/sifting design |
| Dimensions | About 21.5 × 20.27 × 23.99 in, based on the archived AS11 manual associated with this ASIN | 22 × 27 × 29.5 in; 15.75 × 15.75 in entry | 24.41 × 21.18 × 21.73 in | 20.67 × 23.26 × 20.2 in |
| Cat-fit guidance | Seller/manual guidance commonly states 3–22 lb; verify the current listing and manual | Automatic mode for cats at least 3 lb; official guidance describes suitability through roughly 25 lb, while physical fit remains the practical limit | Manufacturer guidance: 3.3–22 lb | Manufacturer guidance: 2.2–33 lb |
| Entry | Open top; archived manuals list roughly 13.8 in from floor to entry | 15.75 × 15.75 in opening; 6.9 in step height | 7.87 in entry height; opening about 7.87 × 10.03 in | 13.86 in entry height; optional step may help some cats |
| Waste capacity | Public AS11 materials conflict between 7 L and 10 L; confirm the current variant | Official FAQ lists a 5.5 × 13.5 × 9.25 in waste drawer | 7 L waste bin; manufacturer advertises up to 15 days for one cat | 11.23 L waste bin; manufacturer advertises up to 14 days for one cat |
| Connectivity | No app or Wi-Fi features advertised for this ASIN | 2.4 GHz Wi-Fi and Whisker app for status, weight and usage insights | 2.4 GHz Wi-Fi and PETKIT app | Android/iOS Neakasa app for monitoring and controls |
| Litter guidance | Clumping bentonite or mineral litter; archived manuals warn against tofu and crystal litter | Most clumping or scoopable litter; avoid non-clumping, newspaper and wood-pellet litters | Clumping clay, tofu or mixed litter within stated particle dimensions | Fast-clumping scoopable litter; manufacturer states filter compatibility up to about 3 mm diameter and 10 mm length |
| Safety documentation | Infrared and Hall sensors are described in archived AS11 materials; supervise setup and keep sensors clean | OmniSense/SafeCat system combines laser zones, weight sensors and anti-pinch software according to Whisker | PETKIT describes 11 sensors and an anti-pinch structure | Current product materials describe six infrared-sensor pairs and four weight sensors |
Important: Manufacturer weight limits do not guarantee comfortable physical fit. Measure the cat's body length, turning posture and mobility.
Choose AS11 when
You want a simple app-free open top and accept thinner documentation.
Read the AS11 review →Choose Litter-Robot 4 when
Support depth, smart monitoring and a mature ecosystem justify the premium.
Read the Litter-Robot 4 review →Choose PuraMax 2 when
A lower entrance and broad clumping-litter compatibility matter.
Read the PuraMax 2 review →Choose Neakasa M1 Plus when
A premium open top and broad stated cat-fit range are the priority.
Read the Neakasa review →