Litter-Robot 4 vs IRIS Top Entry Cat Litter Box
We compare the Litter-Robot 4 and IRIS Top Entry Cat Litter Box head-to-head on performance, features, value, and more. Here's which one wins.
Litter-Robot 4
Scored 9/10 in our testing
Litter-Robot 4
Self-cleaning robot litter box with large enough globe for big cats up to 25 lbs
IRIS Top Entry Cat Litter Box
Grooved lid catches litter from paws as cats exit — minimal tracking
Score Breakdown
| Litter-Robot 4 | Category | IRIS Top Entry Cat Litter Box |
|---|---|---|
| 9.5/10 ✓ | Performance | 9/10 |
| 9.8/10 ✓ | Features | 9/10 |
| 9.5/10 ✓ | Ease of Use | 8.5/10 |
| 7/10 | Value | ✓ 9/10 |
| 9/10 ✓ | Overall | 8.8/10 |
Specs Comparison
| Litter-Robot 4 | Spec | IRIS Top Entry Cat Litter Box |
|---|---|---|
| Cats up to 25 lbs | Capacity | Top entry with grooved lid |
| Auto-clean, app monitoring | Feature | 20.5 x 16 x 14.5 inches |
| Drawer holds 7-10 days | Waste | Snap-on lid, no-scatter walls |
Litter-Robot 4
Pros
- + Self-cleaning — never scoop again
- + Fits cats up to 25 lbs
- + App tracks usage and weight
Cons
- − Very expensive — $700+
- − Large footprint
- − Some cats refuse enclosed boxes
IRIS Top Entry Cat Litter Box
Pros
- + Grooved lid eliminates tracking
- + Dog-proof entry
- + Snap-on lid for easy cleaning
Cons
- − Kittens and elderly cats may struggle to jump in
- − Interior is dark — some cats resist
- − Lid grooves need regular cleaning
Our Verdict
Based on our scoring, the Litter-Robot 4 comes out on top with an overall score of 9/10. Litter-Robot 4 is the only self-cleaning box large enough for big cats up to 25 lbs. Auto-cleans after every use — no scooping ever. The app tracks usage, weight, and waste drawer level. 7-10 day waste capacity. For multi-cat or large-cat households, it eliminates litter box chores.
Buy the Litter-Robot 4 on AmazonRead the full Best Large Litter Boxes for Big Cats 2026 guide for complete reviews of all 5 products.