Litter-Robot alternatives, by what they document

Purobot Max Pro 2

• You use clumping clay and mixed litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 22 lb — the stated maximum according to the manufacturer
• Entry sits 10.03 in from the floor, which matters for kittens, senior or arthritic cats

You use pine pellet litter — the manufacturer excludes or advises against it

Purobot Ultra (P9903)

• You use clumping clay, tofu and mixed litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 22 lb — the stated maximum according to the manufacturer
• Entry sits 10.43 in from the floor, which matters for kittens, senior or arthritic cats

Luma

• You use clumping clay, tofu and mixed litter — the manufacturer states this is supported
• Your heaviest cat is under 22 lb — the stated maximum according to the manufacturer
• Your cat avoids enclosed boxes — this is an open-top design

You use crystal, pine pellet and other pellet litter — the manufacturer excludes or advises against it

ScoopFree OpenSky

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 33 lb — the stated maximum according to the manufacturer
• Your cat avoids enclosed boxes — this is an open-top design

You use tofu, crystal, pine pellet and other pellet litter — the manufacturer excludes or advises against it

Purobot Max 3 (P9906)

• You use clumping clay, tofu and mixed litter — the manufacturer states this is supported
• Your heaviest cat is under 22 lb — the stated maximum according to the manufacturer
• Entry sits 8.03 in from the floor, which matters for kittens, senior or arthritic cats

You use crystal litter — the manufacturer excludes or advises against it

CS106

• You use clumping clay, tofu and mixed litter — the manufacturer states this is supported
• Your heaviest cat is under 25 lb — the stated maximum according to the manufacturer
• Documented 12 L waste capacity

PuraMax 2 (P9902)

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 18 lb — the stated maximum according to the retail listing
• You need a low step-in — the manufacturer states a 7.87 in entry height

M1 Plus

• You use clumping clay litter — the manufacturer states this is supported
• Your heaviest cat is under 33 lb — the stated maximum according to the manufacturer
• Your cat avoids enclosed boxes — this is an open-top design

You use crystal, pine pellet and other pellet litter — the manufacturer excludes or advises against it

ScoopFree SmartSpin

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 25 lb — the stated maximum according to the manufacturer
• Documented 6 L waste capacity

You use tofu and other pellet litter — the manufacturer excludes or advises against it