How to Choose a Self-Cleaning Litter Box

A self-cleaning litter box (also sold as an automatic litter box) separates waste from clean litter after your cat leaves, so you empty a sealed drawer or swap a tray instead of scooping. The models on this site cost from $269.99 (PetSafe ScoopFree Crystal Smart) to $799 (Litter-Robot 5) at each brand’s U.S. store as of 2026-11-02. To choose one, match three things to your household: your cats’ weights, the litter you want to use, and the total cost over two or three years, including liners, filters or trays.

This page explains how the main designs work, gives five questions to answer before you buy, and points you to the tools and guides that go deeper. We don’t test products. Everything here comes from the makers’ published specs and prices, linked in the sources.

How self-cleaning litter boxes work

There are three main mechanisms in the current U.S. line-up, plus a manual option with no motor at all.

Rotating globe (enclosed)

The cat steps into an enclosed drum or globe. After the cat leaves, the drum turns, a screen holds back clean litter, and clumps drop into a waste drawer underneath. Whisker says its “patented sifting process quietly separates cat’s waste from the clean litter,” and that the waste drawer has “a tightly sealed design and a built-in carbon filter.”

Models that use this layout:

• Litter-Robot 4 — $699; cats 3–25 lb; Whisker says one unit “supports up to 4 cats.”
• Litter-Robot 5 — $799; “up to 5 cats at 3-30 lbs.”
• Litter-Robot EVO — $599; cats 3–19 lb; aimed at “households with 1-2 cats.”
• PETKIT Purobot Max 3 — $399.99 on sale (list $499.99); cats 3.3–22 lb and “6+ months old.”
• PetSafe ScoopFree SmartSpin — $399.99; PetSafe calls it a “Spherical Design” that “sifts away waste into a sealed drawer,” for “cats up to 25 lb.”

Globe units are large. The Litter-Robot 4 is 29.5 in tall with a 22 × 27 in footprint, according to Whisker. Whisker lists clumping clay as the litter to use and says translucent or white crystal litter is “not recommended.”

Open-top rotating

This is a rotating drum without a hood. Neakasa’s M1 Plus and M1 Lite Plus are both open-top. Neakasa says the “precision filter sifts particles up to 3 mm in diameter and 10 mm in length,” and recommends fast-clumping bentonite or mineral litter. Both list cats “2.2 lbs - around 33 lbs” and a waste bin of 11.23 L, which Neakasa says lasts “about 14 days for one cat.”

• Neakasa M1 Plus — $399.99 on sale (list $549.99).
• Neakasa M1 Lite Plus — $379.99 on sale (list $499.99).

If you’re weighing a hood against an open top, see open-top vs. enclosed.

Crystal tray

Instead of sifting clumps, this design uses a disposable tray pre-filled with crystal litter. PetSafe describes “leak-proof disposable trays with crystal litter” for the ScoopFree Crystal Smart ($269.99) and says to “change out the disposable tray just once a month.” The box is “designed for use with crystal litter only,” so the trays are an ongoing cost: a 3-pack is $73.49, and PetSafe says each tray “lasts up to 30 days.” PetSafe also says that if your kitten is under 6 months old, you should leave the box unplugged and scoop by hand until then.

Sifting litter boxes (no power)

A sifting box is a manual option with no motor. You lift or roll the box so a slotted part separates clumps from clean litter, then dump the clumps. At PetSmart as of 2026-11-02:

• The ExquisiCat Large Sifting Cat Litter Box was $21.99. PetSmart’s listing says to “sift by lifting the pan.”
• The Omega Paw Roll N’ Clean Swivel Hooded box was $39.99 (regular $49.99). Its listing says it “doesn’t use electricity, liners or filters.”

You still do the work by hand, but there’s nothing to plug in. See sifting and rotating litter boxes.

Five questions to ask before buying

1. How much does each cat weigh, lightest and heaviest?

Every maker states its own weight range, and they differ:

For small or young cats, the makers handle things differently:

• Whisker: under 3 lb, use semi-automatic mode.
• Neakasa: a Kitten Mode turns automatic cleaning off for kittens under 2.2 lb.
• PETKIT: the Purobot Max 3 is for cats 6+ months old.
• PetSafe: leave the Crystal Smart unplugged until your kitten is 6 months old.

For heavier cats, see automatic litter boxes for large cats.

2. How many cats will share it?

Only Whisker publishes a number: up to 4 cats for the Litter-Robot 4, up to 5 for the Litter-Robot 5, and 1–2 for the EVO. Neakasa says the M1 “is perfect for multi-cat households!” without a number. PetSafe says “your mileage may vary depending on how many cats you have in the house.” Some waste capacity claims are stated for one cat. For example, PETKIT says “up to 15 days” for the Purobot Max 3 “in a single-cat home.” See multiple cats.

3. What litter do you want to use?

This rules models in or out quickly:

• Clumping clay: Whisker and Neakasa recommend it.
• Tofu or corn: PETKIT says the Max 3 “works with 99% of clumping litters including clay, tofu, corn, and bentonite-based options.”
• Clumping or non-clumping: PetSafe says the SmartSpin can use “any clumping or non-clumping litter” but recommends premium clumping litter.
• Crystal: the Crystal Smart takes crystal litter only.

More in litter for self-cleaning litter boxes.

4. Where will it go?

Measure the spot, including height. The drum and globe models we list range from 21.7 in tall (Purobot Max 3, 24.4 × 21.2 in footprint) to 29.9 in tall (Litter-Robot 5). PetSafe lists the uncovered Crystal Smart at 27.6 × 19.1 × 6.2 in. Entry sizes vary too:

• Litter-Robot 4 and 5: 15.75 × 15.75 in.
• Purobot Max 3: 10.51 × 10.74 in.
• Neakasa M1 Plus: 13.86 in entry height.

Plan for an outlet nearby: PetSafe lists both of its models as “Plug-in,” and PETKIT lists a rated input of 12V 2A. The Litter-Robot 4 and EVO, the Purobot Max 3 and the SmartSpin all list 2.4 GHz Wi-Fi for their apps.

5. What will it cost over two or three years?

The box price is only the start. Liners, carbon filters, odor packs and crystal trays add up. Whisker says the Litter-Robot 4 lets you use “up to 50% less cat litter,” but no maker or other source we found publishes how much litter a cat uses in a month. Our calculator therefore starts at no litter savings and lets you enter your own numbers. Try the cost calculator, then check per-model supply prices on running costs.

Apps and health tracking

Every model in our table has an app, and the makers describe what it records:

• Whisker (Litter-Robot 4): “Monitor litter box usage and track weight in app.”
• PetSafe (Crystal Smart): “real-time health tracking through activity logs.”
• Neakasa (M1 Plus): you can “track your cat’s daily usage, monitor health trends.”

These are the makers’ descriptions, not medical tools. If your cat’s litter box habits change, talk to your veterinarian.

Where to go next

• Tools: compare every model’s published specs in the comparison table, or work out the total cost with the cost calculator.
• Guides: multiple cats, large cats, cheaper self-cleaning litter boxes, open-top vs. enclosed, and sifting and rotating boxes.
• Models: Litter-Robot 4, Neakasa M1, Litter-Robot 3 vs. 4 (Whisker says the Litter-Robot 3 Connect is “no longer available”), and Litter-Robot alternatives.
• Litter and supplies: litter for the Litter-Robot, litter for self-cleaning boxes, and running costs.

Bottom line

Start with your cats’ weights and the litter you want to use. Those two answers narrow the list to a few models. Then compare the total cost over two or three years, supplies included, against a regular pan and a bag of clumping litter. If a motor isn’t worth it to you, a manual sifting box costs a fraction of the price and still cuts down on scooping.