9 Best Open Top Self Cleaning Litter Box (November 2026)
The best open top self cleaning litter boxes include the Sousia Happypaw XXXL Open-Top Automatic Self Cleaning for large cats and senior access, the otoging Automatic Cat Litter Box for sensor coverage, and the Puemin Automatic Litter Box for app-free simplicity.
On this page (9 sections)
- Which open top self cleaning litter boxes suit which homes
- How these open top self cleaning boxes compare
- How we compared these open top self cleaning litter boxes
- What should you check before buying an open top self cleaning box?
- Which litter works in an open top self cleaning box?
- How much space and noise should you plan for?
- How do you keep an open top box safe for cats?
- What are the trade-offs of an open top design?
- Best open top self cleaning litter box: the verdict
The best open top self cleaning litter box for most homes is the Sousia Happypaw XXXL, because its wide entrance, low threshold and 12L sealed bin handle large cats, senior cats and long stretches between emptyings. Pick the Puemin for button-only control, the PetSafe ScoopFree Crystal Pro if you use crystal litter, or the CATLINK Open-X for a two or three-cat household.
An open top removes the tunnel feeling that keeps some cats away from enclosed robots. It also lets you see the drum, spot a stuck clump and check that the waste drawer is seated without lifting a lid.
This guide compares 9 open-top models on the things that change daily use: entrance width and height, sensor coverage, waste capacity, noise and whether an app is part of the deal. Our score weighs specs, features and buyer feedback against what you're shopping for.
Our picks at a glance
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Best for large cats and senior accessSousia Happypaw XXXL Open-Top Automatic Self Cleaning
9.7/10 our score
See it on Amazon -
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Which open top self cleaning litter boxes suit which homes
The Sousia Happypaw XXXL is the best pick overall, while every other box here wins on one specific need. Start with the size of your cat and the size of your room, then check how often you want to empty the bin.
Sousia Happypaw XXXL Open-Top Automatic Self Cleaning: Best for large cats and senior access
- 55 x 42 cm open entrance
- 12L waste capacity
- Anti-pinch design with infrared sensors
- 2.4GHz Wi-Fi app with health alerts
- 3-year warranty
The widest open-top setup here, with a low threshold for stiff joints and a sealed bin that holds smells. The app adds remote cleaning and usage tracking.
Pros
- Low-entry threshold for senior cats
- 12L sealed waste bin with silicone gasket
- 3-year warranty
Cons
- Heaviest pick in this group
- Only works well with mineral or bentonite clumping litter
Sousia built this for the cat that refuses a covered box. The opening measures 55 x 42 cm and the threshold sits low, so a stiff-jointed senior or a short-legged breed can walk in without a hop.
The 12L waste bin is the biggest stated capacity in this group. Sousia says it holds up to 20 days of waste, which is the difference between a weekly chore and a monthly one for a single cat.
An infrared sensor system stops the drum when a cat enters, and the anti-pinch design covers the gap where a paw could catch. It's rated for cats 6 months and older that stand 15 cm or taller.
The app pairs over 2.4GHz Wi-Fi and tracks bathroom habits, with health alerts when usage changes. A silicone gasket seals the bin and Sousia backs the unit for 3 years.
Its main trade-off is weight: 23.5 lb makes it a two-hand lift when you move it for cleaning. It also works best with mineral or bentonite clumping litter, so crystal users should look elsewhere.
otoging Automatic Cat Litter Box: Best for sensor coverage
- 7 infrared sensor sets plus 1 front radar pedal
- 3 Hall sensor pairs
- Half-gear mechanical structure
- 3 physical buttons
The most layered safety setup in this group, with infrared, radar and Hall sensors working together. The open top keeps the cat in view during a cycle.
Pros
- 7 infrared sensor sets plus radar and Hall pairs
- Chamber fit check before each cycle
- Lowest cabinet height here
Cons
- Only three buttons, no app control
- No stated waste bin size
otoging packs the most sensor hardware into a compact frame. Seven infrared sensor sets watch the drum, a front radar pedal detects a cat stepping up, and three Hall sensor pairs track the mechanism's position.
That's three sensing methods rather than one, and the chamber fit check adds a fourth layer: the drum won't rotate unless the litter chamber is seated correctly. A half-gear mechanical structure gives the movement a physical boundary.
The open top keeps your cat visible during a cycle. At 15.8 in tall, it's the lowest cabinet here, which helps in a room with shelving or a low window sill.
Three physical buttons handle every command. There's no app, no Wi-Fi pairing and no account to set up, which suits a household that wants a box to just work.
The trade-off is reach: without an app you can't start a cycle from another room or look back at how often your cat visited. If those matter, the Sousia or CATLINK boxes fit better.
Puemin Automatic Litter Box: Best for app-free simplicity
- 7 pairs of infrared sensors
- Low entrance with supportive step
- 8L waste bin
- No Wi-Fi or app needed
A plug-in box with three buttons and no connectivity to set up. The low step and open top suit cats from 3 to 17 lb, including short-legged breeds.
Pros
- No Wi-Fi, app or camera setup
- Low entry with a supportive step
- 8L waste bin
Cons
- No remote cleaning or usage history
- Not suitable for tofu litter
Puemin takes the simplest path: plug it in, press a button, and let it clean. No Wi-Fi, no app and no camera means nothing to configure and nothing to break when your router changes.
Seven pairs of infrared sensors pause the cycle when a cat enters. The low entrance and supportive step make the box easier to climb for cats from 3 to 17 lb, and the open top keeps the exit clear.
Waste clumps drop into an 8L bin, which is smaller than the 12L bins on the Sousia and CATLINK units. Expect to empty it more often, though it still beats daily scooping.
It takes bentonite or compatible mineral clumping litter. Puemin states it's not suitable for tofu litter, so check your litter before you buy.
The trade-off against the top pick is capacity and remote control. Choose Puemin if you'd rather not manage another app; choose Sousia if a bigger bin and habit tracking are worth the setup.
PetSafe ScoopFree Crystal Pro: Best for crystal litter households
- Uncovered rake-style box
- Crystal litter only
- Disposable trays with lids
- Health counter and motion sensors
The lightest pick here, and the only one built around crystal litter rather than clumping. Disposable trays cut cleanup to lifting out a sealed lid.
Pros
- Lightest unit in this group
- Health counter tracks visits
- Leak-resistant disposable trays
Cons
- Crystal litter only
- No app or smart features
The PetSafe ScoopFree Crystal Pro is the odd one out because it doesn't use clumping litter at all. Crystal litter absorbs urine and dries solid waste, and a rake drags waste into a disposable tray.
That design means no scooping and no litter refills for weeks. When the tray fills, you lift it out, fit the lid and throw it away.
The plastic lining helps protect your floor from leaks.
At 13.3 lb it's the lightest unit here by several pounds. A health counter and motion sensors track how often your cat visits, which gives you a usage record without an app.
The trade-off is litter lock-in. It's built for crystal litter only, so you can't switch to the clumping brands the other boxes accept.
It's also uncovered rather than open-top with sensors, so the safety story is simpler.
Pick it if you already like crystal litter or want the least mechanical cleaning routine here.
PetPivot Open-Top Litter Box: Best for straightforward cleaning logic
- 7 pairs of safety sensors plus touch pedal
- Mechanical limiter on rotation
- Clumping delay before rotation
- Access step for senior cats
A no-app box that waits for clumps to set before turning, which helps stop waste from smearing the drum. Quick-release parts make deep cleaning easier.
Pros
- Clumping delay reduces smearing
- Tool-free disassembly for cleaning
- Touch-sensitive safety pedal
Cons
- No app, remote control or health reports
- Fewer picks for tech-minded buyers
PetPivot's cleaning logic is its selling point. A built-in clumping delay lets litter set before the drum turns, which reduces pancaking on the bottom and smearing on the walls.
Safety comes in three layers: seven pairs of infrared sensors, a touch-sensitive pedal that interrupts on contact and a mechanical limiter on rotation. The open top and an access step help senior cats get in and out.
It runs without an app, subscription or Wi-Fi. For a senior owner who doesn't want a phone in the loop, that's a real advantage over the smart boxes.
Deep cleaning is easier than most: the modular parts release without tools, so you can reach the sensor cavity and the seams where dust collects. That matters more on an open box than a covered one.
The trade-off is tech. You give up remote cleaning, scheduled cycles and health reports.
If you want those, the Sousia or CATLINK Open-X fits better.
CATLINK Open-X Litter Box: Best for busy multi-cat homes
- 12L waste drawer for about 15 days
- 9-point safety system with 0.1s stop
- Dual-band 2.4GHz and 5GHz Wi-Fi
- Health reports with multi-cat recognition
A large open drum built for two or three cats, with a 12L drawer that stretches emptying to about 15 days for one cat. The app tracks each cat's habits.
Pros
- 12L drawer with 15-day hands-free run
- Dual-band Wi-Fi app control
- Per-cat health reports
Cons
- Multi-cat recognition costs extra in the app
- Largest footprint in this group
The CATLINK Open-X is the multi-cat pick. Its 12L drawer holds up to 15 days of waste for one cat and still stretches the interval in a two or three-cat home.
The wide entrance and 360-degree view help timid cats adjust.
Safety is a 9-point system: an incomplete gear design keeps the entrance open, weight sensors and infrared detection feed a 0.1s emergency stop, and anti-pinch protection covers the edges. CATLINK says it has passed more than 10,000 safety cycles.
The app pairs over Bluetooth and runs on 2.4GHz or 5GHz Wi-Fi. Patented health monitoring tracks each cat's bathroom habits and sends daily and weekly reports.
Multi-cat recognition is a one-time paid feature, so factor that in.
CATLINK lists 30dB operation and triple-layer odor locking. At 23 x 21 x 23 in it takes the most floor space in this group, and the warranty runs one year.
Choose it for a busy multi-cat home; choose the Sousia for a longer warranty and a lower entrance.
Mimfam Open-Top Litter Box: Best for quiet shared rooms
- Mimfam says 32dB operation
- 10L waste bin
- 4 infrared pairs and 3 Hall sensors
- 16.33 x 15.35 in top entrance
The quietest unit here at a claimed 32dB, with a 10L bin and liner bags included. The wide top entrance suits multi-cat homes where a bedroom or study holds the box.
Pros
- 32dB operation
- 10L waste bin with liners included
- Wide 16.33 x 15.35 in top entrance
Cons
- No app or remote cleaning
- Heavier than several rivals here
Mimfam targets the bedroom or study. It runs at a claimed 32dB, quiet enough that a cycle won't cut through a conversation or a light sleeper's night.
The top entrance measures 16.33 x 15.35 in, so a big cat can turn around.
A 10L waste bin handles multi-cat traffic, and liner bags plus a litter mat come in the box. Four pairs of infrared sensors and three Hall sensors stop the cycle when a cat is inside.
The controls stay on the unit. There's no app and no remote cycle, so you manage cleaning from the buttons.
For some owners that's the point: nothing to pair and nothing to update.
The trade-off is the missing smart layer. It's quiet and roomy, but you won't get usage history or health alerts.
Compare it with the Puemin if quiet matters more than app features.
Teweoa Open-Top Litter Box: Best for mixed-size cats
- Fits cats from 3 lb to 22 lb
- 32dB operation
- Infrared and Hall sensors
- Tool-free removable parts
One box for a 22-lb cat and a 3-lb kitten, with an open top that avoids the side-entry trap risk. Quiet cycles keep night cleaning from waking the house.
Pros
- Works for 3 to 22 lb cats
- 32dB operation
- Washable roller and one-touch emptying
Cons
- No stated waste bin size
- No app or smart features
Teweoa is the mixed-size pick. It's built to serve a 22-lb cat and a 3-lb kitten in the same box, and the open top avoids the side-entry risk that can trap a small kitten.
Noise is listed at 32dB, so a night cycle won't wake the house. Infrared and Hall sensors detect a cat and stop operation.
Maintenance is tool-free: the parts lift out, the waste bin empties with one touch, and a washable roller handles the drum. Teweoa advises wiping the body with a damp cloth and keeping water off the base.
The trade-off is smart features. There's no app and no health tracking, so this is a mechanical convenience box rather than a connected one.
Pick it for two cats of very different sizes; pick the CATLINK Open-X if you want per-cat data.
CATLINK Open-X Open-Top Automatic Litter Box: Best for renters who move often
- 12L waste bin for 15 days
- Incomplete gear keeps entrance always open
- One-touch waste disposal with half-auto bag system
- Dual-band Wi-Fi app
The same large Open-X body as the 7.6 pick, sold as a separate model with the same safety gear and 12L drawer. One-touch bag sealing keeps emptying cleaner.
Pros
- 12L drawer with 15-day run
- Always-open entrance with anti-pinch switches
- Dual-band Wi-Fi app control
Cons
- Shares the biggest footprint in this group
- One-year warranty only
This second CATLINK Open-X model shares the same body and safety gear as the 7.6 pick. The 12L bin holds up to 15 days of waste for one cat, and an incomplete gear design keeps the entrance always open.
What sets it apart in the data is the emptying routine. One-touch waste disposal pairs with a half-auto trash bag system, and the elastic litter pad clips on with a single hook.
Add litter without bending, which helps in a senior household.
The app works on 5GHz and 2.4GHz Wi-Fi. Health monitoring separates pee from poop and sends daily and weekly reports for multi-cat homes.
CATLINK lists 30dB operation and triple-layer odor locking. At 23 x 21 x 23 in it takes the same large footprint as the other Open-X, and the warranty is one year.
Pick it if the bag system and top-fill design matter to you. The 7.6 Open-X and this one overlap heavily, so compare the emptying features before choosing between them.
How these open top self cleaning boxes compare
The comparison table lines up waste capacity, footprint and weight so you can see which boxes fit your room and your emptying schedule. Filter first by cat size and bin capacity, then check noise and app support.
| Product | Best for | Waste bin | Size (W x D x H) | Weight | Our score |
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| Sousia Happypaw XXXL Open-Top Automatic Self Cleaning | large cats and senior access | 12L | 21 x 17 x 26 in | 23.5 lb | 9.7 |
| otoging Automatic Cat Litter Box | sensor coverage | 21.02 x 21.9 x 15.8 in | 20.7 lb | 9.3 | |
| Puemin Automatic Litter Box | app-free simplicity | 8L | 21.25 x 20.27 x 24 in | 20.9 lb | 8.9 |
| PetSafe ScoopFree Crystal Pro | crystal litter households | 20.38 x 7.13 x 28 in | 13.3 lb | 7.9 | |
| PetPivot Open-Top Litter Box | straightforward cleaning logic | 21.06 x 15.75 x 21.85 in | 20.6 lb | 7.8 | |
| CATLINK Open-X Litter Box | busy multi-cat homes | 12L | 23 x 21 x 23 in | 21.4 lb | 7.6 |
| Mimfam Open-Top Litter Box | quiet shared rooms | 10L | 21.26 x 20.28 x 24.02 in | 22 lb | 7.5 |
| Teweoa Open-Top Litter Box | mixed-size cats | 21.5 x 20.27 x 24 in | 21.6 lb | 7.2 | |
| CATLINK Open-X Open-Top Automatic Litter Box | renters who move often | 12L | 23 x 21 x 23 in | 21.4 lb | 7.1 |
The biggest split is smart versus simple. Sousia, CATLINK and the two Open-X models pair with an app for remote cycles and habit tracking. otoging, Puemin, PetPivot and Teweoa stay button-only.
Neither path is better; it depends on whether you want health data or fewer moving parts.
The second split is bin size. The 12L bins on the Sousia and CATLINK units buy more days between emptyings than the 8L Puemin or 10L Mimfam.
For a two-cat home, that gap grows.
How we compared these open top self cleaning litter boxes
We compared the 9 models on the features that affect daily life: entrance width and height, sensor count and type, anti-pinch design, waste bin size, noise, litter compatibility and app support.
Our score weighs specs, features and buyer feedback against what you're shopping for.
A 12L sealed bin with a 3-year warranty outranks an 8L bin without one, and a low step for senior cats counts in a box's favor.
We also looked at how each unit handles the open-top risk: without a lid, a cat can exit mid-cycle, so sensor coverage and a mechanical stop matter more here than on enclosed models. If you want the mechanics explained, our guide on how a self cleaning litter box works covers the cycle step by step.
What should you check before buying an open top self cleaning box?
Check the entrance height first. A low threshold matters for senior cats, kittens and short-legged breeds, and the Sousia's design puts this front and center.
Then measure your floor space. The CATLINK Open-X models take 23 x 21 x 23 in, while the otoging fits in 21.02 x 21.9 x 15.8 in.
A tight corner changes which boxes fit.
Finally, decide on app control. If you travel or want habit data, the smart boxes earn their setup time.
If not, the button-only units avoid Wi-Fi pairing and account maintenance.
How wide does the entrance need to be?
Wide enough that your cat walks in without squeezing. The Sousia opening is 55 x 42 cm and the Mimfam top entrance is 16.33 x 15.35 in.
For a large cat, aim for the bigger end of that range.
Does an open top mean more mess?
It can, because there's no hood to contain kicked litter. A mat under the box helps, and the Mimfam kit includes one.
Open tops also make it easier to see and fix a problem before it spreads.
Which litter works in an open top self cleaning box?
Clumping litter works in most open top self cleaning boxes, because the cycle needs waste to form a clump it can separate. Sousia recommends mineral or bentonite clumping litter, and PetPivot is optimized for bentonite and mineral clumping brands.
Puemin accepts bentonite or compatible mineral clumping litter and rules out tofu litter. The PetSafe ScoopFree Crystal Pro is the exception and takes crystal litter only.
Clumping versus crystal
Clumping litter is the default for robot boxes. It lets the drum sift clean litter from waste, and you can use most standard brands.
Crystal litter absorbs urine and dries solid waste, so a rake-style box like the ScoopFree can drag it into a tray.
Crystal means fewer refills and lighter trays, but you're tied to the brand's crystal trays. Clumping means more litter choices and more scooping of the drum over time.
What about tofu litter?
Skip tofu litter in these boxes unless the maker lists it. Puemin explicitly says its box isn't suitable for tofu litter, and the others specify clumping mineral litter for best results.
How much space and noise should you plan for?
Plan for the footprint plus room to open the drawer or lift the drum, and check the noise figure if the box goes near a bedroom. The smallest cabinet here is the otoging at 15.8 in tall; the largest footprint is the CATLINK Open-X at 23 x 21 x 23 in.
Noise figures in this group run from 30dB on the CATLINK units to 32dB on the Mimfam and Teweoa. A claimed 30dB is about a whisper; a normal conversation sits near 60dB.
If you sleep light, the lower figure helps.
Quietest picks here
Mimfam, Teweoa, and both CATLINK Open-X models sit at the quiet end. For more options across all box styles, our roundup of quiet automatic litter boxes compares noise levels and bedroom-friendly designs.
How do you keep an open top box safe for cats?
Keep the sensors clean and the box on a level floor. Open tops expose the sensor windows to dust and kicked litter, so wipe them on the schedule the maker gives.
Check the weight and height limits. Sousia rates its box for cats 6 months and older and 15 cm or taller, and says to keep auto-clean off for smaller cats.
Puemin lists a 3 to 17 lb range.
Use the chamber fit check and the anti-pinch design as intended. otoging won't rotate unless the litter chamber is seated, and PetPivot's mechanical limiter restricts rotation as a backup to its sensors. If your cat is curious about moving parts, watch the first few cycles.
What are the trade-offs of an open top design?
The main trade-off is odor and litter scatter, because there's no hood to hold either in. Sealed waste bins and triple-layer odor systems on the Sousia and CATLINK boxes offset much of that.
The second trade-off is exposure during a cycle. Sensors and anti-pinch designs exist for this reason, and the always-open gear on the CATLINK Open-X keeps the entrance from closing on a cat.
What you gain is visibility and easier access. You can see the litter level, spot a full bin and lift the drum out without wrestling a lid.
For a cat that hates enclosed spaces, that's usually worth the trade.
Best open top self cleaning litter box: the verdict
The best open top self cleaning litter box for most people is the Sousia Happypaw XXXL, with the widest entrance, the biggest sealed bin and the longest warranty here. Its low threshold makes it the one to pick for a senior cat or a large breed.
For a two or three-cat home, the CATLINK Open-X earns its floor space with per-cat health reports and a 15-day drawer. For button-only control, the Puemin keeps setup to zero; for crystal litter, the PetSafe ScoopFree Crystal Pro is the only fit.
If you're still weighing enclosed designs, our roundup of the best automatic litter boxes covers covered models and what they add. For a closer look at one open-top rival, read our Meowant litter box review before you decide.
Our top 3 picks at a glance
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Best for large cats and senior access
Sousia Happypaw XXXL Open-Top Automatic Self Cleaning
9.7/10 our score
See it on Amazon -
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Frequently asked questions
How often do you empty an open top automatic litter box?
Waste bin size sets the rhythm. Sousia's 12L bin holds up to 20 days of waste, and the CATLINK Open-X drawer holds about 15 days for one cat.
The Puemin's 8L bin needs more frequent trips.
Can an open top self cleaning litter box work in a bedroom?
It can if the unit runs quietly and seals smells. Mimfam and Teweoa list 32dB operation, and the CATLINK Open-X lists 30dB with triple-layer odor locking.
Check the noise figure before putting a box near where you sleep.
Do open top automatic boxes need special litter?
Most need clumping litter so waste forms a scoopable clump. Sousia recommends mineral or bentonite clumping litter, and Puemin rules out tofu litter.
The PetSafe ScoopFree Crystal Pro is the exception and takes crystal litter only.
