PETKIT Purobot Ultra Automatic Litter Box vs Litter-Robot 4 Automatic Litter Box

Both are serious self-cleaning boxes, but they aim at different owners. The Litter-Robot 4 is the safer, more proven pick: a simpler 5-button control panel, a 3-25 lb cat range, support for up to 4 cats, and a large base of 348 ratings at 4.9. The Purobot Ultra adds an AI camera, per-cat health logs, auto bag sealing and refilling, and quieter cycles, but it is bigger, has fewer ratings (99 at 4.6), and some camera features sit behind a subscription. Choose the Purobot Ultra if health tracking across many cats matters more than simplicity.

• Choose the Purobot Ultra if you have several cats and want per-cat health logs, stool and urine monitoring, and waste bags that seal and reload themselves.
• Choose the Litter-Robot 4 if you want a proven, low-fuss box with simple controls, a wide cat weight range and strong odor control without a subscription.