Whisker Litter-Robot 4 vs PETKIT PuraMax 2 Self-Cleaning Litter Box

The Litter-Robot 4 is the better pick for most multi-cat homes that want proven odor control, a large drum and a deep app feature set, and its long track record with owners backs that up. The PuraMax 2 is smaller, lighter and has a lower entry, which suits senior cats, small breeds and tight spaces, and its open entry plus 11 sensors are a thoughtful safety design. Build quality is the weak spot on both: Litter-Robot owners report units stopping mid-cycle and feeling less solid than earlier models, while the PuraMax 2 has a thinner review base and a one-year parts warranty. Buy the Litter-Robot 4 for capacity and maturity; buy the PuraMax 2 for a compact, low-entry box.

• Choose the Litter-Robot 4 if you have up to four cats, want the largest drum and the most established app and support ecosystem, and can live with occasional mid-cycle stalls.
• Choose the PuraMax 2 if you have a senior or small cat that needs a low, always-open entry, or you are short on floor space and want a lighter unit.