The most thoroughly documented automatic litter boxes

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

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

Litter-Robot 5

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 30 lb — the stated maximum according to the manufacturer
• Entry sits 15.1 in from the floor, which matters for kittens, senior or arthritic cats

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

Litter-Robot 5 Pro

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 30 lb — the stated maximum according to the manufacturer
• Entry sits 15.1 in from the floor, which matters for kittens, senior or arthritic cats

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

Litter-Robot 4

• 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
• Entry sits 12 in from the floor, which matters for kittens, senior or arthritic cats

You use tofu, pine pellet and other 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

Scooper Young Pro-X

• You use clumping clay litter — the manufacturer states this is supported
• Your heaviest cat is under 22 lb — the stated maximum according to the manufacturer
• Entry sits 14 in from the floor, which matters for kittens, senior or arthritic cats

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

Litter-Robot EVO

• You use clumping clay litter — the manufacturer's manual states this is supported
• Your heaviest cat is under 19 lb — the stated maximum according to the manufacturer
• Entry sits 10.75 in from the floor, which matters for kittens, senior or arthritic cats

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

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

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

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