Litter-Robot 4 vs 3 Connect: Which Should You Buy?
Litter-Robot 4 is clearly better than Litter-Robot 3 Connect. It is quieter, easier for cats to enter, better at sensing and more useful in multi-cat homes.
But for a new 2026 purchase, Litter-Robot 4 is no longer the model we would start with. Whisker now has Litter-Robot 5 Pro, Litter-Robot 5 and Litter-Robot EVO, so most new buyers should compare the current lineup before paying full price for LR4.
Start With These 3 Main Litter Box Pages
Before You Buy LR4, Compare the Newer Litter-Robot Models
Litter-Robot 5 is now the current default Whisker choice for most new buyers. It improves capacity, waste handling and current-generation tracking while keeping the familiar Litter-Robot design.
Litter-Robot 5 Pro sits above LR5 for buyers who specifically want camera-based monitoring. Litter-Robot EVO is the smaller current model for one or two cats. Litter-Robot 4 now makes the most sense when it is discounted or when you already know you prefer the older platform.
Litter-Robot 4
LR4 is a large upgrade over LR3 Connect in the areas you notice every day: noise, access, sensing and app information.
New buyer? Treat LR4 as a discounted value option, not the automatic current-generation choice.
Litter-Robot 4 vs 3 Connect Comparison
| Feature | Litter-Robot 4 | Litter-Robot 3 Connect | Winner |
|---|---|---|---|
| Entrance | Wider and easier to approach | Narrower opening | LR4 |
| Noise | Quieter cycle | Noticeably louder | LR4 |
| Cat detection | More advanced sensing | Older weight-based system | LR4 |
| App data | Litter, waste and weight information | More basic usage history | LR4 |
| Odor control | Better sealed drawer | Older filtered drawer | LR4 |
| Best reason to buy now | Discounted value vs LR5 | Very cheap refurbished replacement | LR4 |
The Differences You Will Actually Notice
Should LR3 Owners Upgrade to LR4, LR5 or EVO?
Do not assume LR4 is the only upgrade path anymore. The current Whisker family gives LR3 owners more choices than it did a few years ago.
Upgrade to LR4 only when the price makes sense. LR4 is still a strong machine, but it now sits between a legacy LR3 and newer current-generation models.
Who Should Buy Litter-Robot 4?
Buy LR4 if...
- You find it at a meaningful discount
- You want a quieter upgrade from LR3
- You have several cats
- Your cat needs a wider entrance
- You prefer the mature LR4 ecosystem
Skip LR4 if...
- LR5 is close in price
- You want the newest Whisker generation
- You specifically want camera monitoring
- You only have one or two cats and want a smaller current model
- Your cat prefers open-top litter boxes
Who Should Buy Litter-Robot 3 Connect?
Buy LR3 only if...
- You find a reliable refurbished unit very cheaply
- You only want basic automatic sifting
- Your cat already uses LR3 comfortably
- You accept buying into a legacy platform
Skip LR3 if...
- The price approaches LR4
- You want quieter cycling
- You need better multi-cat information
- You want a current-generation purchase
Final Verdict
Litter-Robot 4 beats Litter-Robot 3 Connect easily. The wider entrance, quieter operation, stronger sensing and more useful app information are meaningful upgrades.
But most new buyers should now continue to Litter-Robot 5 vs Litter-Robot 4 before purchasing. LR4 is now the value/discount choice; LR5 is the more current mainstream choice.
Troubleshooting & Ownership Help
Frequently Asked Questions
Is Litter-Robot 4 better than Litter-Robot 3 Connect?
Should I buy Litter-Robot 4 or Litter-Robot 5 now?
What is Litter-Robot 5 Pro for?
Where does Litter-Robot EVO fit?
Is Litter-Robot 3 Connect still worth buying?
Current Litter-Robot Comparisons & Guides
More Litter Box Guides
More Home Robots to Explore
SmartRobotReviews may earn a commission from qualifying purchases. Product availability and pricing can change.