The Litter-Robot is now even more automatic.
Say Goodbye to Litter Box Mess: Why the LitterHopper Is a Game-Changer for Cat Owners
If there’s one thing my cat absolutely can’t stand, it’s when her litter box is too full. She makes her frustration crystal clear by kicking excess litter all over the floor. But since adding the LitterHopper to our routine, that daily mess—and the guesswork—is a thing of the past.
The LitterHopper by Whisker is a clever litter storage and dispensing accessory designed for the Litter-Robot 4, our go-to automatic litter box. It acts as a convenient litter reservoir, automatically keeping the litter level just right—no more overfilling or constantly refilling by hand.
To really see how much time and effort it could save, The Spruce Pets put the LitterHopper to the test. My cat Jazzy and I tried it out ourselves, and here’s everything we learned about this smart upgrade for your litter box setup.
Top Picks for Cat Owners
⭐ Best Litter Box Accessory: Litter Robot LitterHopper
⭐ Best Automatic Litter Box: Whisker Litter-Robot 4 – $799
⭐ For Senior Cats: Litter-Robot 4 Ramp – $65
⭐ Must-Have Liner: Waste Drawer Liners – $35
⭐ Odor Control Essential: Carbon Filters 6-Pack – $30
Why It Matters for You and Your Cat
The LitterHopper keeps your cat’s litter at the optimal level without lifting a finger. It’s perfect for busy pet parents, multi-cat households, or anyone tired of the daily scooping and refilling routine. Plus, it’s fully compatible with the Litter-Robot 4, which already does most of the dirty work for you.
Whether you’re upgrading your current setup or shopping for the best automatic litter box accessories, the LitterHopper is a smart, mess-reducing addition that keeps both cats and humans happy.
Who Should Buy the LitterHopper?
If you already own a Litter-Robot 4 or are planning to invest in one, the LitterHopper is a must-have upgrade. This smart accessory makes daily litter box maintenance even easier by automatically dispensing the perfect amount of litter—no more overfilling, underfilling, or constant top-offs.
That said, the LitterHopper isn’t a one-size-fits-all solution. It’s exclusively designed for the Litter-Robot 4 and won’t work with other litter boxes or previous Litter-Robot models. So, if you’re not using the Litter-Robot 4, this accessory won’t be compatible with your setup.
But for Litter-Robot 4 users? It’s a total game-changer.
How the LitterHopper Works
The LitterHopper is a smart, time-saving accessory designed to work exclusively with the Litter-Robot 4. Think of it as a built-in storage tank that holds clean litter and automatically refills your litter box when needed—no scooping, guessing, or daily top-offs required.
Here’s how it works: after each cleaning cycle, the Litter-Robot 4 uses internal sensors to detect if the litter level has dropped below the optimal range. If it has, the LitterHopper kicks in and releases just the right amount of fresh litter. This only happens when needed—not every cycle—so you won’t waste excess litter or overfill the box.
One of the best features? You’ll receive a notification via the Whisker app when your LitterHopper reservoir is running low. Refilling is super easy: just pop off the lid, pour in your favorite clumping litter, and snap the lid back on. The LitterHopper will take care of the rest during your cat’s next bathroom break.
This smart accessory helps keep your cat’s litter box clean, efficient, and perfectly filled—automatically.
Installation Experience: Not the Easiest Part
One of the things I love most about the Litter-Robot 4 is that it comes fully assembled right out of the box—no tools, no confusing instructions, just plug and go (although the shipping box is massive for that reason). Unfortunately, the same can’t be said for installing the LitterHopper.
To get the LitterHopper up and running, I had to partially disassemble the Litter-Robot 4, which was a bit intimidating—especially without clear step-by-step guidance on reassembly. So, if you’re planning to install one, be prepared to set aside some time and patience.
💡 Pro tip: If you have cats already using your Litter-Robot 4, make sure you have at least one extra litter box available during setup. The general rule of thumb is one box per cat, plus one more—so a backup is essential while your Litter-Robot is temporarily offline.
The installation also requires swapping out the existing bonnet with a new one included in the LitterHopper kit. Set aside at least 10–15 minutes for the whole process, especially if it’s your first time opening up the unit.
On the bright side, adding the LitterHopper to the Whisker app is refreshingly simple—it took me literally five seconds to pair it and start monitoring everything from my phone.
Performance: Quiet, Consistent, and Worry-Free
While the installation process for the LitterHopper could be smoother, its performance has been nothing short of excellent. Since setting it up, I haven’t run into any issues—no litter jams, no overdispensing, and zero maintenance headaches.
One of the standout features? It’s whisper-quiet. The LitterHopper dispenses just the right amount of litter without making a sound. I wouldn’t even know it was running if not for the real-time updates from the Whisker app. It’s automation at its finest—clean, quiet, and efficient.
Litter Capacity: Plenty for One, Enough for Several
The LitterHopper holds up to 13 cups of litter, which is plenty for a single-cat household like mine. I typically only need to refill it every two weeks or so. For homes with multiple cats, you’ll likely need to top it off more often—but the good news is, there’s no guesswork involved. The Whisker app will notify you exactly when it’s time to refill.
Price: High for Plastic, Worth It for Convenience
At around $99, the LitterHopper might seem a bit pricey for a plastic accessory. But after using it, I’ve found the time saved each week and the stress it relieves from my cat (and me) makes it worth the investment.
Want a better deal? Look for bundle offers that include both the Litter-Robot 4 and the LitterHopper—these packages can help cut down on overall costs if you’re buying both for the first time.
Final Verdict: Worth It for Hassle-Free Cat Care
If you already own a Litter-Robot 4, the LitterHopper is a smart add-on that enhances your setup and saves you time. It’s especially helpful for new cat parents or anyone tired of constant litter refills. While it’s not a must-have for every budget, it significantly reduces weekly upkeep and keeps your cat’s litter box running smoothly—automatically.
Frequently Asked Questions
🛠 How do you install the LitterHopper?
To install the LitterHopper, you’ll need to remove your current Litter-Robot 4 bonnet and replace it with the one included in the LitterHopper kit. The full instructions are available on the Whisker website or via the app.
🔄 Is the LitterHopper compatible with all Litter-Robot models?
No. The LitterHopper is only compatible with the Litter-Robot 4. It does not work with previous models like the Litter-Robot 3.
🧴 What type of litter works with the LitterHopper?
The LitterHopper works best with clumping clay litter, but it’s also compatible with most clay and silica-based clumping litters. Avoid non-clumping or pellet-style litter for best results.
Our Top Picks for Litter-Robot Accessories
- 🏆 Best Automatic Litter Box: Whisker Litter-Robot 4 – $799
- 💡 Best Add-On Accessory: LitterHopper by Whisker – $99
- 🧓 Ramp for Senior Cats: Litter-Robot 4 Ramp – $65
- 🗑 Drawer Liners: Waste Drawer Liners – $35
- 🌬 Odor Control Filters: Carbon Filter 6-Pack – $30