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Best Open-Top Smart Litter Boxes in 2026: For Cats That Refuse Enclosed Automatic Boxes

Compare the best open-top automatic litter boxes for cats that dislike enclosed models, including litter fit, app features, cleaning, and limitations.

Best Open-Top Smart Litter Boxes in 2026

If your cat refuses a globe-style or hooded automatic litter box, the decision is not simply “which smart box is best?” It is whether you can get automatic cleaning without giving up the open view, easy entry, and familiar posture your cat prefers.

Open-top models can be a sensible compromise, but they still differ substantially in usable space, litter compatibility, app features, waste capacity, footprint, and maintenance. The right choice depends first on your cat’s behavior and body size, then on how much monitoring and automation you actually need.

Veterinary guidance generally favors boxes that are large, clean, easy to access, and acceptable to the individual cat. The ASPCA notes that many cats prefer uncovered boxes, while the AAFP and ISFM guidelines emphasize that cats vary: size, cleanliness, odor, and access may matter more than whether a box is covered or uncovered for some cats. (ASPCA; AAFP/ISFM guidelines)

Quick comparison

| Model | Best fit | Key verified details | Main limitation to investigate | |---|---|---|---| | Neakasa M1 Plus | Larger cats and owners who want a spacious open-top design | 11.23-liter waste bin, 7.17-liter litter capacity, 13.86-inch entry, app support, manufacturer-listed range of about 2.2–33 pounds | Designed for fast-clumping or scoopable litter; independent testing reported wet-litter sticking and noticeable odor in one test environment | | PETLIBRO Luma | Owners who want the most advanced monitoring features | 17.4-inch entrance, 11-liter waste drawer, support for clumping, tofu, and mixed litter, up to 10-cat visit tracking | Manufacturer lists suitability for cats over 2.2 and under 22 pounds; advanced AI and cloud-video features require paid plans | | Oneisall Ease S1 | Buyers wanting an open rectangular design with a choice of app connectivity | 11-liter waste drawer, approximately 2.6–30-pound range, cleaning delay of about five minutes, app version with Wi-Fi and Bluetooth | Placement, guard selection, and monthly full-tray cleaning require attention |

These are not interchangeable choices. A large cat may fit the Luma’s entrance but exceed its stated weight range. A household using tofu litter should pay closer attention to guard and litter guidance than to app features. And a cat that is easily startled may benefit more from a gradual transition than from the most feature-rich machine.

1. Neakasa M1 Plus: best starting point for bigger cats

The Neakasa M1 Plus is the most compelling option here if your priority is an open-top format with a comparatively broad manufacturer-listed weight range. Neakasa lists compatibility for cats weighing approximately 2.2 to 33 pounds, along with a 13.86-inch entry, 7.17-liter litter capacity, and 11.23-liter waste bin. It also offers app controls for Android and iOS. (Neakasa)

That combination makes it worth considering for large cats or cats that dislike entering enclosed machinery. However, weight range is not the same as usable interior comfort. Before buying, check whether your cat can turn around, squat, and exit without pressing against the sides or rear grate.

Litter choice is another important constraint. Neakasa says the M1 Plus is intended for fast-clumping or scoopable litter and is not designed for non-clumping, loosely clumping, newspaper, or wood-pellet litter. (Neakasa)

Independent testing from WIRED found the unit easy to assemble, open-top, app-connected, and suitable for cats up to 33 pounds. WIRED also reported that the app could monitor use and adjust cleaning-related settings. Its test identified drawbacks as well: confusing app translation, wet litter sticking to the rear grate, and noticeable waste odor after approximately five days in that test environment. (WIRED)

Choose the M1 Plus if: your cat needs a generous open design, you are comfortable using compatible clumping litter, and app control matters more than having the broadest litter options.

Think twice if: you expect an open-top unit to eliminate odor management or want to use pellets, newspaper litter, or another excluded material.

2. PETLIBRO Luma: best for app-based monitoring

The PETLIBRO Luma stands out for owners who want more than a cleaning schedule. PETLIBRO lists a 17.4-inch entrance, an 11-liter waste drawer, and support for clumping, tofu, and mixed litters. It states that the Luma is intended for cats over 2.2 pounds and under 22 pounds. (PETLIBRO product page)

The larger entrance may appeal to cats that dislike squeezing through a narrow opening, but the manufacturer’s under-22-pound limit makes this a less obvious choice for very large breeds or heavier cats. Measure and weigh your cat rather than relying on appearance alone.

The Luma’s strongest differentiator is monitoring. PETLIBRO says it can track litter-box visits for up to 10 cats, and its optional features include AI waste analysis and cloud video through paid subscription plans. (PETLIBRO Luma information) Tom’s Guide described the Luma as an open-top robotic litter box with an integrated camera, individual-cat recognition, visit and weight tracking, and AI-supported behavior or waste monitoring. (Tom’s Guide)

Those features may be useful in a multi-cat home or for owners who want to notice changes in bathroom routines. They should not be treated as veterinary diagnosis. A sudden change in urination, defecation, frequency, or straining warrants veterinary advice, whether or not an app identifies it.

Also account for the subscription distinction. The Luma can be attractive without advanced services, but the AI and cloud-video functions are not simply one-time hardware features according to PETLIBRO’s current information. Confirm current plan terms before purchase.

Choose the Luma if: monitoring, multi-cat visit tracking, a tall entrance, and broader listed litter compatibility are your priorities.

Think twice if: your cat is over the stated weight limit, you do not want subscription features, or you prefer a simpler appliance with fewer connected functions.

3. Oneisall Ease S1: best for a straightforward rectangular format

The Oneisall Ease S1 takes a more conventional rectangular approach to the open-top automatic litter box. Oneisall lists an 11-liter waste drawer, a cat range of approximately 2.6 to 30 pounds, and a footprint of 22.05 by 23.03 by 21.97 inches. Its automatic cleaning begins approximately five minutes after use. (Oneisall)

That delay can give a cat time to finish and leave before a cycle begins, although any automatic unit should be introduced according to its manual and your cat’s comfort. The listed footprint also deserves attention: open-top does not mean small. Measure the floor area, including the space needed for a litter mat and access around the box.

Connectivity depends on the version. Oneisall says the app-controlled model supports both 2.4GHz and 5GHz Wi-Fi plus Bluetooth, while the standard version does not provide the same app connectivity. (Oneisall) This makes it important to verify the exact configuration in your cart rather than assuming every Ease S1 includes the same smart features.

Litter and guard selection also matter. Oneisall says the included 5mm litter guard is intended for mineral and bentonite litter, while an optional 12mm guard is offered for mixed and tofu litter. The company recommends a flat, hard surface instead of carpet for sensor operation and recommends cleaning the full tray assembly at least monthly. (Oneisall)

Choose the Ease S1 if: you want an open rectangular unit, a five-minute cleaning delay, and the choice between standard and app-connected versions.

Think twice if: you need a compact footprint, want to place it on carpet, or do not want to manage guard and litter compatibility.

How to choose an open-top automatic litter box

1. Start with your cat, not the app

Record your cat’s weight, age, mobility, current box dimensions, and preferred litter. A senior or mobility-limited cat may need a lower entry or step. A large cat needs enough interior room to turn and posture. A kitten may require special caution because manufacturer weight ranges and automatic mechanisms are not automatically appropriate for every young cat.

2. Match the litter before comparing features

A machine that supports your preferred litter is usually a better choice than one with a superior app but incompatible material. Confirm whether the box accepts clumping clay, tofu, mixed litter, pellets, or only specific grades. Using excluded litter can contribute to failed sifting, jams, tracking, or poor waste separation.

3. Separate capacity claims from real maintenance

An 11-liter waste drawer is a specification, not a guaranteed number of days between emptying. Frequency varies with cat count, urine output, clump size, litter depth, and how often you inspect the drawer. Open-top designs may also make odor more noticeable because the waste area is less enclosed. Plan for routine emptying, litter replenishment, surface wiping, and periodic deep cleaning.

4. Check safety and placement documentation

Look for clearly explained weight or presence sensing, pause behavior, cleaning-cycle controls, and manual-cleaning instructions. Do not assume that an app alert proves a machine is safe in every situation. Follow the manual, place the unit on the required level surface, and leave the specified clearance from walls or furniture.

5. Treat smart monitoring as supplementary

Visit counts, weight readings, cameras, and AI analysis may help you notice patterns, particularly in multi-cat homes. They do not replace observation or veterinary care. Also check whether Wi-Fi is required, which frequency bands are supported, and whether the features you want require a subscription.

Transition tips for cats that reject enclosed boxes

Keep the existing box available when introducing the automatic model. Put the new unit in a familiar, quiet location, use familiar unscented litter where compatible, and allow your cat to investigate without forcing entry. Do not remove the old preferred box immediately. Once the cat is using the new box consistently, follow the manufacturer’s instructions for enabling automatic cycles.

The best open-top automatic litter box is therefore the one your cat will comfortably use and you can realistically maintain. The Neakasa M1 Plus is the stronger candidate for larger cats and a roomy open format; the PETLIBRO Luma is the monitoring-focused option; and the Oneisall Ease S1 is worth considering for its rectangular design, cleaning delay, and configuration choices. Verify current specifications, consumable costs, warranty terms, and return conditions on the official product pages before buying.

Sources

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