Litter-Robot 4 Review: The Smartest Self-Cleaning Litter Box for 2025

This in-depth Litter-Robot 4 review explores its sleek design, self-cleaning technology, odor control system, smart app integration, and performance in multi-cat homes.

schedule August 8, 2025

article 4 min read

check_circle Pros

Truly hands-free cleaning: Eliminates daily scooping.
Excellent odor control: Sealed waste drawer and carbon filter reduce smells.
Smart app features: Real-time usage and waste level tracking.
Quiet and cat-friendly: Minimal noise during operation.
Efficient litter use: Reduces litter waste over time.
Multi-cat capability: Works well in households with several cats.

cancel Cons

High price: One of the most expensive litter boxes on the market.
Large footprint: May be challenging for very small spaces.
Requires electricity: Needs to be placed near an outlet.
Learning curve for some cats: Shy cats may take time to adjust.
App subscription for advanced features: Some data tracking features may require Whisker’s premium plan.

The Litter-Robot 4 by Whisker is the latest generation of the world’s most popular self-cleaning litter box. Designed for cat owners who value convenience, cleanliness, and technology, it automates one of the least pleasant pet chores — scooping the litter box. In this review, we’ll cover its design, features, performance, pros, cons, and whether it’s worth the premium price in 2025.

Design & Build Quality

The Litter-Robot 4 is sleek, modern, and surprisingly compact compared to the Litter-Robot 3 Connect. Its futuristic globe design blends well into most home interiors. The build is solid, using high-quality materials that feel durable enough to handle years of daily use.

Dimensions: 29.5″ H x 22″ W x 27″ D
Weight: ~24 lbs (without litter)
Capacity: Suitable for cats weighing 3–25 lbs

The front entryway is widened compared to earlier models, making it easier for larger cats or multi-cat households. A built-in nightlight helps cats feel comfortable entering in low-light environments.

Key Features

1. Automatic Self-Cleaning

After your cat exits, the Litter-Robot 4 automatically begins its cleaning cycle. The globe rotates, sifting clumps into a sealed waste drawer below. This ensures your cat always has a clean litter bed without you lifting a scoop.

2. Odor Control System

The sealed waste drawer, combined with a carbon filter, significantly reduces odors. For even better performance, you can add Whisker’s OdorTrap™ packs, which neutralize smells more effectively than standard litter boxes.

3. Multi-Cat Friendly

Its large entryway and spacious interior comfortably accommodate multiple cats. The cleaning cycle is triggered each time a cat uses it, keeping the litter fresh for the next feline.

4. Smart App Integration

Through the Whisker app, you can:

Monitor waste drawer levels
Track your cats’ usage habits (helpful for health monitoring)
Adjust cycle delays
Get notifications when the drawer is full
Control the Litter-Robot remotely

The app works with iOS and Android, and integrates with smart home systems like Alexa and Google Home.

5. Quiet Cleaning Operation

The motor is noticeably quieter than in the Litter-Robot 3 Connect, making it less likely to startle sensitive cats.

6. Safety Sensors

A suite of sensors ensures your cat is never inside during the cleaning cycle. The system pauses if it detects motion inside the globe.

7. Improved Litter Efficiency

The sifting design minimizes litter waste, and the unit works with most clumping litters, including clay and some natural alternatives.

Performance in Daily Use

During testing, the Litter-Robot 4 consistently delivered clean litter after each use, with minimal odor. The waste drawer usually needed emptying every 5–7 days for one cat, or every 3–4 days for two cats. The app’s usage data provided surprising insights, such as early signs of changes in bathroom habits — potentially useful for detecting health issues.

How It Compares to Litter-Robot 3 Connect

The Litter-Robot 4 offers:

Quieter operation
Larger entry and more spacious interior
Better odor control with improved sealing
More accurate waste level sensing
Enhanced app integration and data tracking

While the Litter-Robot 3 Connect remains capable, the Litter-Robot 4 is clearly a more refined, user-friendly upgrade.

Who Should Buy the Litter-Robot 4?

If you’re a busy cat owner, dislike scooping, or live in a multi-cat home, the Litter-Robot 4 can save you significant time and keep your home smelling fresher. It’s especially worthwhile for tech-savvy owners who appreciate the app’s usage insights. However, budget-conscious buyers may find it hard to justify the price.

Final Verdict

The Litter-Robot 4 is the most advanced self-cleaning litter box available in 2025. It’s quiet, efficient, and packed with smart features that make cat ownership cleaner and more convenient. While expensive, its time savings, hygiene benefits, and health monitoring capabilities make it an excellent investment for serious cat owners.